Angiosperms — Flowering Plants

1. Supertaxonomy Overview

The Angiosperms, or flowering plants, are the largest living radiation of seed plants and the dominant plant lineage in most modern terrestrial ecosystems. They include hundreds of thousands of species ranging from minute floating aquatics and ephemeral herbs to vines, succulents, giant tropical herbs, and some of the largest broadleaved trees. Nearly every familiar category of cultivated plant—cereals, fruits, vegetables, legumes, spices, fibers, timber trees, beverages, ornamentals, and medicinal plants—contains major angiosperm representatives. Their ecological reach is similarly broad, extending from tropical rainforests and deserts to alpine tundra, freshwater systems, and marine seagrass meadows (Soltis et al. 2018; Zuntini et al. 2024).

Angiosperms form a monophyletic lineage of seed plants distinguished fundamentally by reproductive structures in which the ovules are enclosed within carpels rather than exposed directly to pollen as in living gymnosperms. The flower organizes the reproductive organs, pollination occurs through the stigma and style or equivalent carpel tissues, and fertilization is followed by formation of seeds enclosed within fruits. Double fertilization produces both the embryo and a nutritive endosperm lineage, one of the defining developmental features of flowering plants (Soltis et al. 2018).

The apparent unity of this reproductive system masks extraordinary structural diversity. A grass floret, an orchid flower, a magnolia blossom, a catkin-bearing tree, a cactus flower, and a submerged Ceratophyllum reproductive structure are all modifications of the same underlying angiosperm reproductive architecture. Much of flowering-plant evolution can therefore be understood as repeated elaboration, reduction, fusion, specialization, and ecological repurposing of a shared developmental system.

Modern angiosperm classification is organized primarily through phylogenetic evidence. The Angiosperm Phylogeny Group (APG) framework transformed flowering-plant systematics by replacing many traditional rank-based assemblages with clades supported by molecular data. APG V, published online in 2026, updates that framework using the enormous expansion of nuclear phylogenomic evidence accumulated since APG IV. Most APG IV orders and families remain supported, but the new synthesis recognizes that ancient hybridization, incomplete lineage sorting, organellar inheritance, and rapid radiation can create real disagreement among gene trees and genomic compartments (Angiosperm Phylogeny Group 2026).

This shift is especially important near the base of the great mesangiosperm radiation. The earliest-diverging living angiosperm branches—Amborellales, Nymphaeales, and Austrobaileyales—are comparatively stable, but relationships among Magnoliids, Monocots, Ceratophyllids, and Eudicots contain deeper nuclear–plastid conflict. Tree TSAR therefore uses the most stable major lineages as navigational tentpoles while resisting the temptation to force every ancient divergence into a completely resolved hierarchy.

Tree TSAR displays the historic suprageneric name Angiospermae Lindl. beneath the public-facing name Angiosperms. The page itself functions as the principal gateway from Seed Plants into the flowering-plant radiation. Rather than reproducing every named node recognized in phylogenetic literature, Tree TSAR emphasizes clades and explanatory grades that remain biologically meaningful, stable enough for navigation, and useful to a broad botanical audience.

2. Placement in Tree TSAR

Within Tree TSAR, Angiosperms occupy the broad pathway:

Seed Plants → Angiosperms

From this point, Tree TSAR does not require every family to pass through the same number of intermediate categories. The supertaxonomy ribbon is a curated phylogenetic scaffold, not a demand for structural symmetry. Empty levels are intentional when no additional clade is both stable and useful enough to justify a tentpole.

The earliest-diverging angiosperm orders therefore pass almost directly to the Angiosperm level. A family in Austrobaileyales, for example, may follow Schisandraceae → Austrobaileyales → Angiosperms → Seed Plants. Tree TSAR does not currently insert the paraphyletic ANA grade as an obligatory ribbon level.

The principal mesangiosperm pathways are more elaborate. The APG V-informed Tree TSAR framework recognizes Magnoliids, Monocots, and Ceratophyllids as major angiosperm tentpoles. Eudicots are biologically a genuine clade, but Tree TSAR compresses that extra node and routes its early-diverging orders through the operational Basal Eudicots grade and its immense crownward radiation through Core Eudicots. This keeps the ribbon informative without adding a level that would simply repeat the same relationship across most eudicot pages.

Representative pathways are therefore: Lauraceae → Laurales → Magnoliids → Angiosperms → Seed Plants; Poaceae → Poales → Commelinids → Monocots → Angiosperms → Seed Plants; Ceratophyllaceae → Ceratophyllales → Ceratophyllids → Angiosperms → Seed Plants; and Buxaceae → Buxales → Basal Eudicots → Angiosperms → Seed Plants.

Within Core Eudicots, all available supertaxonomy levels may be useful. Rosaceae → Rosales → Rosids → Superrosids → Core Eudicots → Angiosperms → Seed Plants and Acanthaceae → Lamiales → Asterids → Superasterids → Core Eudicots → Angiosperms → Seed Plants illustrate the fully populated form of the scaffold. APG V changes several of these deeper relationships: Vitales and Saxifragales are retained in Superrosids but outside Rosids, Santalales and Caryophyllales are no longer placed in Superasterids, and Berberidopsidales remains the sister lineage of Asterids within Superasterids (Angiosperm Phylogeny Group 2026).

This approach preserves the central principle of the earlier Tree TSAR angiosperm treatment: the goal is not to display every named node in the angiosperm tree, but to identify the most stable and recognizable evolutionary landmarks between family-level taxonomy and Seed Plants. APG V changes the content of some pathways, but it strengthens rather than weakens that selective design philosophy.

3. Evolutionary History and Fossil Context

The origin of flowering plants remains one of the central problems in plant evolutionary biology. Molecular-clock analyses often infer a crown-angiosperm history extending earlier than the most secure fossil record, and estimates are sensitive to calibration strategy, model assumptions, taxon sampling, and treatment of fossil uncertainty. The fossil record itself becomes unequivocally angiosperm-rich during the Early Cretaceous, when distinctive pollen, flowers, fruits, seeds, and vegetative remains begin to document a rapidly diversifying radiation (Friis et al. 2010; Magallón et al. 2015; Zuntini et al. 2024).

By the Barremian and Aptian, roughly 130–113 million years ago, flowering plants were already represented by multiple distinctive lineages. Early fossils include plants associated with Nymphaeales, Chloranthales, Magnoliids, Monocots, and other stem or crown lineages whose exact positions continue to be evaluated. The appearance of securely dated tricolpate pollen at approximately 123 million years ago demonstrates that the Eudicot lineage had already arisen by the late Barremian, implying that several major mesangiosperm divergences necessarily predate that fossil marker (Gravendyck et al. 2025).

The earliest angiosperm radiation was not a simple ladder of slowly separated branches. Large nuclear datasets reveal extremely short ancient internodes and extensive gene-tree discordance near several deep nodes. Zuntini et al. (2024), sampling nearly 8,000 genera with 353 nuclear genes and 200 fossil calibrations, inferred an early burst of diversification that generated more than 80% of extant angiosperm orders. Such rapid splitting provides a biological explanation for why different genes and genomes can retain conflicting histories even when the major surviving lineages themselves are well supported.

The Cretaceous also marks the ecological rise of flowering plants from comparatively minor components of many floras to dominant elements of terrestrial vegetation. Core Eudicots diversified dramatically, Monocots established multiple terrestrial and aquatic lineages, Magnoliids became important forest elements, and interactions with insects and other animals expanded in complexity. By the Late Cretaceous and early Cenozoic, flowering plants had transformed forest structure, herbivore resources, pollination networks, and terrestrial nutrient cycles.

Angiosperm diversification did not end with the Cretaceous radiation. Zuntini et al. (2024) recovered a later increase in diversification during the Cenozoic associated with global climatic cooling and continued gene-tree conflict. The modern flora is therefore the result of repeated episodes of radiation, extinction, ecological expansion, genome duplication, hybridization, and geographic reorganization rather than a single evolutionary burst.

Tree TSAR uses fossils to provide this temporal and evolutionary context without forcing extinct plants into the active extant supertaxonomy hierarchy. Fossils may illuminate the age and former diversity of major lineages even where their precise family assignment remains uncertain.

4. Classification and Circumscription

The modern concept of Angiosperms is phylogenetically secure even though their internal branching history is still being refined. The deepest extant branches are generally recovered as Amborellales, followed by Nymphaeales and Austrobaileyales. These three successive lineages are often called the ANA grade. They are not a clade because their common ancestor also gave rise to all remaining flowering plants (Soltis et al. 2018; Zuntini et al. 2024).

The remaining flowering plants form the enormous mesangiosperm radiation. Its principal living components are Magnoliids, Monocots, Ceratophyllids, and Eudicots, but the exact relationships among those branches have been unusually difficult to resolve. Plastid trees and large nuclear analyses can support different deep arrangements, and ancient hybridization has been proposed as an important contributor to the conflict, especially in the placement of Magnoliids + Chloranthales relative to Monocots and Eudicots (Guo et al. 2021; Stull et al. 2023; Angiosperm Phylogeny Group 2026).

APG V represents a methodological advance because it does not treat plastid–nuclear disagreement as mere noise that must be forced into a single tidy topology. Instead, the classification gives greater weight to robust, densely sampled nuclear evidence where appropriate and explicitly leaves relationships uncertain when gene-tree conflict remains substantial. This principle is visible in the separate treatment of Ceratophyllids, whose order and family are secure even though their closest living relatives remain uncertain (Angiosperm Phylogeny Group 2026).

The APG V linear classification enumerates 65 orders and 407 families. Most APG IV structure survives, but several changes matter directly to Tree TSAR. Chloranthales is now placed beneath the broader Magnoliids heading; Ceratophyllales is treated separately as Ceratophyllids rather than included in Eudicots; Fabids are restricted to the four nitrogen-fixing orders; the former COM orders shift toward the Malvid side of the rosid radiation; Santalales and Caryophyllales are left outside both Superrosids and Superasterids; and Oncothecales and Cardiopteridales are recognized as distinct orders (Angiosperm Phylogeny Group 2026).

Tree TSAR uses APG V principally as the current higher-level phylogenetic and ordinal scaffold, not as an automatic command to accept every family circumscription. Family rank is evaluated separately under the Tree TSAR family-rank framework. When APG V merges or splits families, Tree TSAR may follow that treatment, retain an alternative specialist classification, or flag the case for dedicated review depending on monophyly, phylogenomic support, diagnosability, evolutionary depth, comparative rank coherence, and nomenclatural utility. This distinction allows Tree TSAR to remain APG-informed without surrendering its explicit rank-determination methodology.

The same principle applies below family rank. Tree TSAR can adopt a stable APG V pathway while independently evaluating generic and species circumscriptions using specialist evidence. Higher-level navigation and lower-level taxonomic judgment therefore remain connected but not mechanically dependent on one another.

5. Morphology, Biology, and Identification

Angiosperms are best recognized by a suite of reproductive innovations rather than by one vegetative feature. The ovules are enclosed within one or more carpels before fertilization; pollen is received by a stigma or comparable receptive carpel surface rather than directly at an exposed ovule; and the mature seeds are enclosed within a fruit derived from the ovary and sometimes additional floral tissues. Together these features distinguish the flowering-plant reproductive system from that of living gymnosperms (Soltis et al. 2018).

The flower itself is extraordinarily variable. Floral organs may be numerous or few, separate or fused, radially symmetric or strongly bilateral, conspicuous or nearly invisible. Some lineages reduce individual flowers and aggregate them into structures that function visually as a larger unit, while wind-pollinated groups may reduce petals and other organs almost completely. The evolutionary identity of a flower therefore lies in its developmental and reproductive organization, not in possessing showy petals.

Double fertilization is another central feature. One sperm fertilizes the egg to form the embryo, while another fuses with the central cell of the female gametophyte to initiate endosperm. The endosperm is commonly triploid but varies among lineages because female gametophyte structure itself varies. This nutritive tissue supports embryo and seed development and represents one of the most consequential reproductive innovations of the clade.

Angiosperms also tend to possess highly reduced male and female gametophytes, rapid reproductive cycles relative to many gymnosperms, and specialized water-conducting cells including vessel elements in most lineages. None of these traits should be treated as an absolutely universal field character. Some early-diverging angiosperms lack ordinary vessel elements, and many reproductive features are too microscopic to use in casual identification.

Vegetatively, flowering plants encompass nearly every major growth form found among vascular plants. They may be annual or perennial herbs, shrubs, trees, lianas, aquatics, epiphytes, geophytes, succulents, carnivores, hemiparasites, or holoparasites. Leaves may be simple or compound, broad or needle-like, alternate, opposite, whorled, reduced to scales, transformed into traps, or lost entirely. Parallel venation is common in Monocots but not universal, just as reticulate venation is common in Eudicots but not exclusive to them.

The reconstructed ancestral flower remains a subject of active study. Comparative analyses suggest that early crown angiosperms likely possessed bisexual flowers with multiple concentric whorls of separate organs, but exact character states remain sensitive to phylogeny and reconstruction methods (Sauquet et al. 2017). Living early-diverging lineages should therefore not be described as unchanged models of the ancestral flower.

6. Distribution and Ecology

Angiosperms occur on every continent and occupy nearly every environment in which vascular plants can persist. They dominate most tropical, temperate, and many boreal forests; form grasslands, savannas, shrublands, marshes, and deserts; reach alpine and polar environments; and include extensive freshwater and marine aquatic radiations. Their ecological success is one of the defining features of the modern biosphere (Zuntini et al. 2024).

The clade spans an extraordinary range of ecological strategies. Forest trees shape canopy architecture and carbon storage; grasses and sedges dominate open and wet habitats; epiphytes occupy forest canopies; succulents store water in arid systems; parasitic plants draw resources from other vascular plants; carnivorous plants supplement nutrient acquisition by trapping animals; and numerous aquatics have independently returned to life partly or wholly submerged in water.

Animal interactions are central to angiosperm ecology. Insects, birds, bats, and other animals pollinate flowers, while fruits and seeds are dispersed by vertebrates, invertebrates, wind, water, gravity, and explosive mechanisms. The rise of flowering plants profoundly altered food webs and contributed to diversification in multiple animal groups, although the timing and direction of individual coevolutionary relationships differ among lineages.

Symbioses with fungi and microbes are equally important. Mycorrhizal partnerships influence nutrient acquisition across much of the clade; legumes and related lineages contain major nitrogen-fixing symbioses; orchids depend on fungi for germination; and numerous plants host specialized microbial communities within leaves, stems, roots, and reproductive structures. These relationships make angiosperm ecology inseparable from the broader ecological networks in which plants live.

Because the lineage is so large, no single ecological narrative applies universally. The value of Angiosperms as a Tree TSAR tentpole lies not in implying ecological uniformity, but in providing the common evolutionary framework from which these repeated radiations and specializations can be understood.

7. Human Uses and Cultural Importance

Human civilization is overwhelmingly dependent on flowering plants. The world’s principal cereal crops are Monocots, while Core Eudicots supply major legumes, fruits, vegetables, oil crops, beverages, fibers, spices, and stimulants. Other angiosperm lineages provide timber, medicines, resins, dyes, fragrances, forage, building materials, and industrial compounds. The economic importance of the clade is therefore not concentrated in one evolutionary branch but distributed across much of the angiosperm tree.

Agriculture has transformed a relatively small subset of wild angiosperm diversity into the foundation of global food systems. Domestication altered seed retention, fruit size, dormancy, flowering time, architecture, chemistry, and other traits in different crops, while continued breeding and hybridization produced thousands of cultivars. Wild relatives of these crops retain genetic variation that remains essential for future improvement.

Horticulture is equally dominated by Angiosperms. Orchids, lilies, roses, magnolias, hydrangeas, rhododendrons, palms, grasses, aroids, cacti, succulents, bulbs, annual bedding plants, flowering trees, and countless other ornamentals belong to the clade. Botanical gardens consequently cultivate flowering plants not only for display but also for research, education, ex situ conservation, and documentation of plant diversity.

Cultural meanings are deeply embedded in flowering plants. Foods, religious symbols, ceremonial plants, medicines, perfumes, textiles, national emblems, traditional ecological knowledge, and landscape identities are often associated with particular angiosperm species. The history of human migration, trade, empire, agriculture, and horticulture is therefore intertwined with the movement and cultivation of flowering plants.

This importance also creates responsibility. Unsustainable harvest, land conversion, overcollection, agricultural homogenization, and invasive introductions can place both wild species and the ecosystems that support them at risk. Human dependence on angiosperms is therefore also a conservation dependence.

8. Conservation Significance

The enormous species richness of Angiosperms includes both some of the most abundant plants on Earth and thousands of highly restricted or threatened lineages. Habitat loss, land-use conversion, altered fire regimes, invasive species, pathogens, overharvest, pollution, hydrological change, and climate change operate differently across forests, grasslands, wetlands, islands, mountains, deserts, and freshwater systems. Conservation priorities must therefore be evaluated at family, genus, species, population, and ecosystem scales rather than inferred from the success of Angiosperms as a whole.

Phylogenetic diversity adds another dimension to conservation. A species-poor ancient branch can contain evolutionary information not represented by a species-rich younger radiation. Amborella, Ceratophyllids, several small Magnoliid lineages, and isolated families throughout the tree demonstrate why conservation value cannot be measured by species number alone. Protecting deep branches preserves unique combinations of genomes, morphology, chemistry, and ecological history.

Crop wild relatives are a particularly important conservation priority because they retain genetic variation relevant to disease resistance, salinity, heat, drought, nutritional quality, and future breeding. Genetic erosion in wild and traditional cultivated populations can therefore reduce options available to future agriculture even when modern crop acreage remains large.

Ex situ conservation strategies must be biologically matched to the plants involved. Conventional seed banking works well for many species with desiccation-tolerant seeds, but recalcitrant seeds, clonal crops, highly specialized parasites, some aquatic plants, and many tropical trees may require living collections, tissue culture, cryopreservation, or carefully managed field populations. Effective conservation therefore depends on accurate taxonomy and detailed knowledge of reproductive biology.

Tree TSAR’s phylogenetic framework can contribute by making relationships explicit. Knowing whether two threatened plants represent close relatives within a large radiation or isolated branches of deep evolutionary history changes how their losses are interpreted and how living collections can be designed to maximize evolutionary representation.

9. Major Included Groups

ANA Grade

The ANA grade consists of the three successive earliest-diverging living angiosperm orders: Amborellales, Nymphaeales, and Austrobaileyales. The acronym comes from the first letters of those names. The grade is phylogenetically informative but paraphyletic, so Tree TSAR does not currently use it as a required supertaxonomy tentpole.

Amborellales contains only Amborellaceae and the New Caledonian Amborella trichopoda, consistently recovered as sister to all other living Angiosperms. Nymphaeales contains early-diverging aquatic lineages. Austrobaileyales includes woody and climbing plants whose surviving families preserve another deep branch immediately below the mesangiosperms. These lineages are crucial for reconstructing early angiosperm characters but should not be treated as unchanged ancestral plants.

Magnoliids

Under APG V, Magnoliids comprise Chloranthales together with the traditional four-order Magnoliidae core of Canellales, Piperales, Magnoliales, and Laurales. Recent nuclear evidence supports Chloranthaceae as sister to that four-order core, prompting APG V to place Chloranthales beneath the broader Magnoliids heading (Guo et al. 2021; Angiosperm Phylogeny Group 2026).

Tree TSAR therefore uses Magnoliids as a five-order public-facing tentpole but does not equate that broader group with the formally defined four-order name Magnoliidae. The dedicated Magnoliids narrative explains this nomenclatural distinction and the specialist family circumscriptions used by Tree TSAR.

Monocots

The Monocots are a large, strongly supported angiosperm clade containing eleven APG V orders. Acorales and Alismatales form the earliest major branches, followed by Petrosaviales and the larger crownward radiation containing Dioscoreales, Pandanales, Liliales, Asparagales, Arecales, Commelinales, Zingiberales, and Poales. Grasses, orchids, palms, sedges, aroids, lilies, yams, gingers, and many aquatic lineages belong here.

Tree TSAR displays Monocotyledoneae DC. as the scientific-name counterpart to the public-facing Monocots label. Within the clade, additional tentpoles such as Commelinids are used selectively where they improve navigation.

Ceratophyllids

The Ceratophyllids contain Ceratophyllales, Ceratophyllaceae, and the aquatic genus Ceratophyllum. APG V treats them as a separate informal major group because their higher placement remains uncertain. Several analyses recover Ceratophyllales as sister to Eudicots, whereas other nuclear analyses produce different positions; APG V therefore declines to place the lineage within Eudicots or Monocots (Angiosperm Phylogeny Group 2026).

Tree TSAR places Ceratophyllids directly beneath Angiosperms and displays Ceratophyllanae Takht. ex Reveal & Doweld as the formal scientific counterpart. The case illustrates an important Tree TSAR principle: secure circumscription does not require falsely precise placement.

Eudicots

The Eudicots are another enormous and strongly supported angiosperm clade, ancestrally associated with triaperturate pollen. Tree TSAR does not currently devote a separate required tentpole level to Eudicots because doing so would add a largely redundant step between Angiosperms and its two more useful navigational units.

The early-diverging eudicot orders Ranunculales, Proteales, Trochodendrales, and Buxales are grouped operationally under Basal Eudicots. This is a paraphyletic explanatory grade rather than a clade. The remaining great radiation forms the monophyletic Core Eudicots, equivalent to Gunneridae in the Tree TSAR treatment. Core Eudicots then contain major pathways including Superrosids, Rosids, Superasterids, and Asterids together with several important orders whose deeper positions remain less completely resolved.

10. Similar, Overlapping, or Historically Confused Groups

Flowering plants and Angiosperms are synonyms in ordinary botanical usage. Angiospermae Lindl. is the historical scientific-name form displayed by Tree TSAR; the APG system normally uses the informal clade label Angiosperms rather than assigning the group a mandatory Linnaean rank.

Seed Plants are broader than Angiosperms. They include both flowering plants and the living gymnosperm lineages. Angiosperms are therefore not synonymous with Spermatophyta.

The traditional contrast between Monocots and Dicots is obsolete as a formal phylogenetic division. Monocots are a genuine clade, but traditional dicotyledons combine Eudicots, Magnoliids, and several early-diverging angiosperm lineages and are therefore paraphyletic. The word dicot remains useful descriptively in horticulture and introductory botany but should not be interpreted as a modern clade.

Mesangiosperms are the enormous crownward radiation remaining after the ANA grade. The term is phylogenetically useful and includes nearly all living Angiosperm diversity, but Tree TSAR does not currently use it as an obligatory navigation tier. The deepest relationships among its principal branches also remain subject to genomic conflict.

ANA grade refers only to Amborellales, Nymphaeales, and Austrobaileyales. It is not synonymous with basal angiosperms in every historical sense, and it is not a clade. Tree TSAR discusses it as an explanatory grade rather than a fixed ribbon category.

Eudicots should not be equated with Core Eudicots. Ranunculales, Proteales, Trochodendrales, and Buxales diverge before the Core Eudicot crown. Tree TSAR’s Basal Eudicots page exists specifically to make that distinction legible while acknowledging the grade’s paraphyletic nature.

Finally, the APG V Magnoliids concept should not be assumed to match every historical use of Magnoliidae or Magnolianae. APG V includes Chloranthales beneath the Magnoliids heading, whereas the formally defined Magnoliidae used in modern phylogenetic nomenclature corresponds to the traditional four-order core.

11. Additional Information

Angiosperm Phylogeny Group V: The principal current order-level classification framework used by Tree TSAR and the primary source for the 2026 higher-level updates. APG V — Journal of Systematics and Evolution (opens in a new tab)

Plants and Fungal Trees of Life / Kew phylogenomics: Zuntini et al. (2024) provides the largest densely sampled nuclear angiosperm tree currently central to APG V. Phylogenomics and the rise of the angiosperms (opens in a new tab)

Angiosperm Phylogeny Website: Detailed, continuously updated syntheses of angiosperm relationships, morphology, chemistry, fossils, and classification. Angiosperm Phylogeny Website (opens in a new tab)

Plants of the World Online: Current nomenclature, accepted names, synonymy, and distributions at family, genus, and species levels. Plants of the World Online (opens in a new tab)

World Flora Online and Catalogue of Life: Complementary global name and taxonomic resources useful for checking accepted taxa and alternative treatments. World Flora Online (opens in a new tab)

GBIF and the Paleobiology Database: Useful for occurrence data and fossil-distribution context once readers move from the angiosperm-wide framework to particular lineages. GBIF (opens in a new tab)

Tree TSAR should continue to treat APG V as a higher-level backbone rather than an unquestioned family-rank authority. When specialist evidence supports an alternative family circumscription, the relevant family-rank assessment should be documented transparently while the order and higher supertaxonomy remain APG V-informed. This keeps the system internally consistent and prevents global-backbone preferences from silently overriding independently adjudicated Tree TSAR decisions.

12. References and Further Reading

Angiosperm Phylogeny Group (2016) An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV. Botanical Journal of the Linnean Society 181(1): 1–20. https://doi.org/10.1111/boj.12385 (opens in a new tab)

Angiosperm Phylogeny Group, Byng JW, Chase MW, Christenhusz MJM, Fay MF, Li D-Z, Ma H, Mabberley DJ, Soltis DE, Soltis PS, et al. (2026) Large-scale nuclear and plastid phylogenomic analyses inform an updated Angiosperm Phylogeny Group classification: APG V. Journal of Systematics and Evolution. Online 18 June 2026. https://www.jse.ac.cn/EN/channel/316 (opens in a new tab)

Friis EM, Pedersen KR, Crane PR (2010) Diversity in obscurity: Fossil flowers and the early history of angiosperms. Philosophical Transactions of the Royal Society B: Biological Sciences 365(1539): 369–382. https://doi.org/10.1098/rstb.2009.0227 (opens in a new tab)

Gravendyck J, Krencker F-N, Riding JB, et al. (2025) Barremian tricolpate pollen from Portugal—New evidence for the age of eudicot-related angiosperms. Proceedings of the National Academy of Sciences of the United States of America 122(21): e2421470122. https://doi.org/10.1073/pnas.2421470122 (opens in a new tab)

Guo X, Fang D, Sahu SK, Yang S, Guang X, Folk RA, Smith SA, Chanderbali AS, Chen S, Liu M, et al. (2021) Chloranthus genome provides insights into the early diversification of angiosperms. Nature Communications 12: 6930. https://doi.org/10.1038/s41467-021-26922-4 (opens in a new tab)

Li H-T, Luo Y, Gan L, Ma P-F, Gao L-M, Yang J-B, Cai J, Gitzendanner MA, Fritsch PW, Zhang T, et al. (2021) Plastid phylogenomic insights into relationships of all flowering plant families. BMC Biology 19: 232. https://doi.org/10.1186/s12915-021-01166-2 (opens in a new tab)

Magallón S, Gómez-Acevedo S, Sánchez-Reyes LL, Hernández-Hernández T (2015) A metacalibrated time-tree documents the early rise of flowering plant phylogenetic diversity. New Phytologist 207(2): 437–453. https://doi.org/10.1111/nph.13264 (opens in a new tab)

One Thousand Plant Transcriptomes Initiative (2019) One thousand plant transcriptomes and the phylogenomics of green plants. Nature 574: 679–685. https://doi.org/10.1038/s41586-019-1693-2 (opens in a new tab)

Sauquet H, von Balthazar M, Magallón S, Doyle JA, Endress PK, Bailes EJ, Barroso de Morais E, Bull-Hereñu K, Carrive L, Chartier M, et al. (2017) The ancestral flower of angiosperms and its early diversification. Nature Communications 8: 16047. https://doi.org/10.1038/ncomms16047 (opens in a new tab)

Soltis DE, Soltis PS, Endress PK, Chase MW, Manchester SR, Judd WS, Majure LC, Mavrodiev EV (2018) Phylogeny and Evolution of the Angiosperms: Revised and Updated Edition. University of Chicago Press, Chicago. https://press.uchicago.edu/ucp/books/book/chicago/P/bo27704248.html (opens in a new tab)

Stevens PF (2001 onwards) Angiosperm Phylogeny Website. Missouri Botanical Garden, St. Louis. https://www.mobot.org/MOBOT/Research/APweb/ (opens in a new tab)

Stull GW, Qu X-J, Parins-Fukuchi C, Yang Y-Y, Yang J-B, Yang Z-Y, Hu Y, Ma H, Soltis PS, Soltis DE, et al. (2023) Deep reticulation: The long legacy of hybridization in vascular plant evolution. The Plant Journal 114: 743–766. https://doi.org/10.1111/tpj.16142 (opens in a new tab)

Zuntini AR, Carruthers T, Maurin O, Bailey PC, Leempoel K, Brewer GE, Epitawalage N, Françoso E, Gallego B, Johnson MG, et al. (2024) Phylogenomics and the rise of the angiosperms. Nature 629: 843–850. https://doi.org/10.1038/s41586-024-07324-0 (opens in a new tab)