Flowering plant

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Flowering plant
Temporal range: Early Cretaceous (Valanginian)-Recent
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Spermatophytes
Clade: Angiosperms
Groups (APG IV)[1]

Basal angiosperms

Core angiosperms


Flowering plants are

seeds are enclosed within a fruit. They are by far the most diverse group of land plants with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species.[7] Angiosperms were formerly called Magnoliophyta (/mæɡˌnliˈɒfətə, -əˈftə/).[8]

Angiosperms are distinguished from the other

within their seeds, and fruits that completely envelop the seeds. The ancestors of flowering plants diverged from the common ancestor of all living gymnosperms before the end of the Carboniferous, over 300 million years ago. In the Cretaceous, angiosperms diversified explosively, becoming the dominant group of plants across the planet.

Agriculture is almost entirely dependent on angiosperms, and a small number of flowering plant families supply nearly all plant-based food and livestock feed. Rice, maize, and wheat provide half of the world's calorie intake, and all three plants are cereals from the Poaceae family (colloquially known as grasses). Other families provide materials such as wood, paper and cotton, and supply numerous ingredients for traditional and modern medicines. Flowering plants are also commonly grown for decorative purposes, with certain flowers playing a significant role in many cultures.

Out of the "Big Five"

botanic gardens. Otherwise, around 40% of plant species may become extinct due to human actions such as habitat destruction, introduction of invasive species, unsustainable logging and collection of medicinal or ornamental plants. Further, climate change is starting to impact plants
and is likely to cause many species to become extinct by 2100.

Distinguishing features

Angiosperms are terrestrial vascular plants; like the gymnosperms, they have

seed plants
in several ways.

Feature Description Image
Flowers The
seed plants.[9]
A Narcissus flower in section. Petals and sepals are replaced here by a fused tube, the corona, and tepals.
Reduced gametophytes, three cells in male, seven cells with eight nuclei in female (except for basal angiosperms)[10] The gametophytes are smaller than those of gymnosperms.
fertilization, which in gymnosperms is up to a year.[12]
Embryo sac is a reduced female gametophyte
Endosperm Endosperm forms after fertilization but before the zygote divides. It provides food for the developing embryo, the cotyledons, and sometimes the seedling.[13]
carpel enclosing the ovules
Once the ovules are fertilised, the carpels, often with surrounding tissues, develop into fruits. Gymnosperms have unenclosed seeds.[14]
Peas (seeds, from ovules) inside pod (fruit, from fertilised carpel).
Xylem made of vessel elements Open vessel elements are stacked end to end to form continuous tubes, whereas gymnosperm xylem is made of tapered
tracheids connected by small pits.[15]
Xylem vessels (long tubes).


Ecological diversity

The largest angiosperms are Eucalyptus gum trees of Australia, and Shorea faguetiana, dipterocarp rainforest trees of Southeast Asia, both of which can reach almost 100 metres (330 ft) in height.[16] The smallest are Wolffia duckweeds which float on freshwater, each plant less than 2 millimetres (0.08 in) across.[17]

  • Photosynthetic and parasitic
  • Gunnera captures sunlight for photosynthesis over the large surfaces of its leaves, which are supported by strong veins.
    Gunnera captures sunlight for photosynthesis over the large surfaces of its leaves, which are supported by strong veins.
  • Orobanche purpurea, a parasitic broomrape with no leaves, obtains all its food from other plants.
    Orobanche purpurea, a parasitic broomrape with no leaves, obtains all its food from other plants.

Considering their method of obtaining energy, some 99% of flowering plants are

orchids for part or all of their life-cycle,[18] or on other plants, either wholly like the broomrapes, Orobanche, or partially like the witchweeds, Striga.[19]

In terms of their environment, flowering plants are cosmopolitan, occupying a wide range of

coniferous forest.[20] The seagrasses in the Alismatales grow in marine environments, spreading with rhizomes that grow through the mud in sheltered coastal waters.[21]

Some specialised angiosperms are able to flourish in extremely acid or alkaline habitats. The

sundews, many of which live in nutrient-poor acid bogs, are carnivorous plants, able to derive nutrients such as nitrate from the bodies of trapped insects.[22] Other flowers such as Gentiana verna, the spring gentian, are adapted to the alkaline conditions found on calcium-rich chalk and limestone, which give rise to often dry topographies such as limestone pavement.[23]

As for their

climbing on other plants in the manner of vines or lianas.[25]

Taxonomic diversity

The number of species of flowering plants is estimated to be in the range of 250,000 to 400,000.

APG IV added five new orders (Boraginales, Dilleniales, Icacinales, Metteniusales and Vahliales), along with some new families, for a total of 64 angiosperm orders and 416 families.[1]

The diversity of flowering plants is not evenly distributed. Nearly all species belong to the eudicot (75%), monocot (23%), and magnoliid (2%) clades. The remaining five clades contain a little over 250 species in total; i.e. less than 0.1% of flowering plant diversity, divided among nine families. The 25 most species-rich of 443 families,[32] containing over 166,000 species between them in their APG circumscriptions, are:

The 25 largest angiosperm families
Group Family English name No. of spp.
Eudicot Asteraceae or Compositae daisy 22,750
orchid 21,950
Eudicot Fabaceae or Leguminosae pea, legume 19,400
Eudicot Rubiaceae madder 13,150 [33]
Monocot Poaceae or Gramineae
Eudicot Lamiaceae or Labiatae mint 7,175
Eudicot Euphorbiaceae
Eudicot Melastomataceae melastome 5,005
Eudicot Myrtaceae myrtle 4,625
Eudicot Apocynaceae dogbane 4,555
Monocot Cyperaceae
Eudicot Malvaceae mallow 4,225
Monocot Araceae arum 4,025
Eudicot Ericaceae heath 3,995
Eudicot Gesneriaceae gesneriad 3,870
Eudicot Apiaceae or Umbelliferae parsley 3,780
Eudicot Brassicaceae or Cruciferae cabbage 3,710
Magnoliid dicot Piperaceae
Monocot Bromeliaceae bromeliad 3,540
Eudicot Acanthaceae acanthus 3,500
Eudicot Rosaceae rose 2,830
Eudicot Boraginaceae borage 2,740
Eudicot Urticaceae nettle 2,625
Eudicot Ranunculaceae
Magnoliid dicot Lauraceae laurel 2,500


History of classification

From 1736, an illustration of Linnaean classification

The botanical term "angiosperm", from Greek words angeíon (

Wilhelm Hofmeister's work on embryo-sacs, Angiosperm came to have its modern meaning of all the flowering plants including Dicotyledons and Monocotyledons.[36][37] The APG system[31] treats the flowering plants as an unranked clade without a formal Latin name (angiosperms). A formal classification was published alongside the 2009 revision in which the flowering plants rank as the subclass Magnoliidae.[38] From 1998, the Angiosperm Phylogeny Group (APG) has reclassified the angiosperms, with updates in the APG II system in 2003,[39] the APG III system in 2009,[31][40] and the APG IV system in 2016.[1]



In 2019, a molecular phylogeny of plants placed the flowering plants in their evolutionary context:[41]







conifers and allies

flowering plants
seed plants
vascular plants
land plants


The main groups of living angiosperms are:[42][1]


Amborellales 1 sp. New Caledonia

Nymphaeales c. 80 spp.[43] water lilies & allies

Austrobaileyales c. 100 spp.[43] woody plants

Magnoliids c. 10,000 spp.[43] 3-part flowers, 1-pore pollen, usu. branch-veined leaves

Chloranthales 77 spp.[44]
Woody, apetalous

Monocots c. 70,000 spp.[45] 3-part flowers, 1 cotyledon
, 1-pore pollen, usu. parallel-veined leaves  

Ceratophyllales c. 6 spp.[43] aquatic plants

Eudicots c. 175,000 spp.[43] 4- or 5-part flowers, 3-pore pollen, usu. branch-veined leaves

Core angiosperms

In 2024, Alexandre R. Zuntini and colleagues constructed a tree of some 6,000 flowering plant genera, representing some 60% of the existing genera, on the basis of analysis of 353 nuclear genes in each specimen. Much of the existing phylogeny is confirmed; the rosid phylogeny is revised.[46]

Tree of Angiosperm Phylogeny 2024

Fossil history

Adaptive radiation in the Cretaceous created many flowering plants, such as Sagaria in the Ranunculaceae.


appear suddenly and in great diversity in the fossil record in the Early Cretaceous (~130 mya).[48][49] Claimed records of flowering plants prior to this are not widely accepted.[50] Molecular evidence suggests that the ancestors of angiosperms diverged from the gymnosperms during the late Devonian, about 365 million years ago.[51] The origin time of the crown group of flowering plants remains contentious.[52] By the Late Cretaceous, angiosperms appear to have dominated environments formerly occupied by ferns and gymnosperms. Large canopy-forming trees replaced conifers as the dominant trees close to the end of the Cretaceous, 66 million years ago.[53] The radiation of herbaceous angiosperms occurred much later.[54]



Angiosperm flower showing reproductive parts and life cycle

The characteristic feature of angiosperms is the flower. Its function is to ensure

axil of a leaf.[56] The flower-bearing part of the plant is usually sharply distinguished from the leaf-bearing part, and forms a branch-system called an inflorescence.[37]

Flowers produce two kinds of reproductive cells.

The flower may consist only of these parts, as in wind-pollinated plants like the willow, where each flower comprises only a few stamens or two carpels.[37] In insect- or bird-pollinated plants, other structures protect the sporophylls and attract pollinators. The individual members of these surrounding structures are known as sepals and petals (or tepals in flowers such as Magnolia where sepals and petals are not distinguishable from each other). The outer series (calyx of sepals) is usually green and leaf-like, and functions to protect the rest of the flower, especially the bud.[58][59] The inner series (corolla of petals) is, in general, white or brightly colored, is more delicate in structure, and attracts pollinators by colour, scent, and nectar.[60][61]

Most flowers are

Monoecious plants have separate male and female flowers on the same plant; these are often wind-pollinated,[63] as in maize,[64] but include some insect-pollinated plants such as Cucurbita squashes.[65][66]

Fertilisation and embryogenesis

Double fertilization requires two sperm cells to fertilise cells in the ovule. A pollen grain sticks to the stigma at the top of the pistil, germinates, and grows a long pollen tube. A haploid generative cell travels down the tube behind the tube nucleus. The generative cell divides by mitosis to produce two haploid (n) sperm cells. The pollen tube grows from the stigma, down the style and into the ovary. When it reaches the micropyle of the ovule, it digests its way into one of the synergids, releasing its contents including the sperm cells. The synergid that the cells were released into degenerates; one sperm makes its way to fertilise the egg cell, producing a diploid (2n) zygote. The second sperm cell fuses with both central cell nuclei, producing a triploid (3n) cell. The zygote develops into an embryo; the triploid cell develops into the endosperm, the embryo's food supply. The ovary develops into a fruit. and each ovule into a seed.[67]

Fruit and seed

The fruit of the horse chestnut tree, showing the large seed inside the fruit, which is dehiscing or splitting open.

As the embryo and endosperm develop, the wall of the embryo sac enlarges and combines with the

pericarp, whose form is closely associated with type of seed dispersal system.[68]

Other parts of the flower often contribute to forming the fruit. For example, in the apple, the hypanthium forms the edible flesh, surrounding the ovaries which form the tough cases around the seeds.[69]

Apomixis, setting seed without fertilization, is found naturally in about 2.2% of angiosperm genera.[70] Some angiosperms, including many citrus varieties, are able to produce fruits through a type of apomixis called nucellar embryony.[71]

Sexual selection

Sexual selection is described as natural selection arising through preference by one sex for certain characteristics in individuals of the other sex. Sexual selection is a common concept in animal evolution but, with plants, it is often overlooked because many plants are hermaphrodites. Flowering plants show many characteristics that are often sexually selected for. For example, flower symmetry, nectar production, floral structure, and inflorescences are just a few of the many secondary sex characteristics acted upon by sexual selection. Sexual dimorphisms and reproductive organs can also be affected by sexual selection in flowering plants.[72]

Adaptive function of flowers

Charles Darwin in his 1878 book The Effects of Cross and Self-Fertilization in the Vegetable Kingdom

hybrid vigor or heterosis. Once flowers became established in a lineage as an evolutionary adaptation to promote cross-fertilization, subsequent switching to inbreeding usually becomes disadvantageous, in large part because it allows expression of the previously masked deleterious recessive mutations, i.e. inbreeding depression

Also, Meiosis in flowering plants provides a direct mechanism for repairing DNA through genetic recombination in reproductive tissues.[75] Sexual reproduction appears to be required for maintaining long-term genomic integrity and only infrequent combinations of extrinsic and intrinsic factors permit shifts to asexuality.[75] Thus the two fundamental aspects of sexual reproduction in flowering plants, cross-fertilization (outcrossing) and meiosis appear to be maintained respectively by the advantages of genetic complementation and recombinational repair.[74]

Interactions with humans

Practical uses

Harvesting rice in Arkansas, 2020
Dal tadka
, Indian lentil soup

Agriculture is almost entirely dependent on angiosperms, which provide virtually all plant-based food and livestock feed. Much of this food derives from a small number of flowering plant families.[76] For instance, half of the world's calorie intake is supplied by just three plants - wheat, rice and maize.[77]

Major food-providing families[76]
Family English Example foods from that family
Poaceae Grasses, cereals Most feedstocks, inc.
sugar cane, sorghum
Fabaceae Legumes, pea family
lentils; for animal feed, clover, alfalfa
Solanaceae Nightshade family
Cucurbitaceae Gourd family Squashes, cucumbers, pumpkins, melons
Brassicaceae Cabbage family Cabbage and its varieties, e.g. Brussels sprout, broccoli; mustard; oilseed rape
Apiaceae Parsley family Parsnip, carrot, parsley, coriander, fennel, cumin, caraway
Rutaceae Rue family[78] Oranges, lemons, grapefruits
Rosaceae Rose family[79] Apples, pears, cherries, apricots, plums, peaches

Flowering plants provide a diverse range of materials in the form of wood, paper, fibers such as cotton, flax, and hemp, medicines such as digoxin and opioids, and decorative and landscaping plants. Coffee and hot chocolate are beverages from flowering plants.[76]

Cultural uses

Bird-and-flower painting: Kingfisher and iris kachō-e woodblock print by Ohara Koson (late 19th century)

Both real and

fictitious plants play a wide variety of roles in literature and film.[80] Flowers are the subjects of many poems by poets such as William Blake, Robert Frost, and Rabindranath Tagore.[81] Bird-and-flower painting (Huaniaohua) is a kind of Chinese painting that celebrates the beauty of flowering plants.[82] Flowers have been used in literature to convey meaning by authors including William Shakespeare.[83]
Flowers are used in a variety of art forms which arrange cut or living plants, such as
floral emblems; a survey of 70 of these found that the most popular flowering plant family for such emblems is Orchidaceae at 15.7% (11 emblems), followed by Fabaceae at 10% (7 emblems), and Asparagaceae, Asteraceae, and Rosaceae all at 5.7% (4 emblems each).[85]


Viola calcarata, a species highly vulnerable to climate change.[86]

IUCN and Royal Botanic Gardens, Kew suggest that around 40% of plant species are threatened with extinction.[87] The majority are threatened by habitat loss, but activities such as logging of wild timber trees and collection of medicinal plants, or the introduction of non-native invasive species, also play a role.[88]

Relatively few plant diversity assessments currently consider climate change,[87] yet it is starting to impact plants as well. About 3% of flowering plants are very likely to be driven extinct within a century at 2 °C (3.6 °F) of global warming, and 10% at 3.2 °C (5.8 °F).[89] In worst-case scenarios, half of all tree species may be driven extinct by climate change over that timeframe.[87]

Conservation in this context is the attempt to prevent extinction, whether

botanic gardens around the world maintain living plants, including over 40% of the species known to be threatened, as an "insurance policy against extinction in the wild."[90] The United Nations' Global Strategy for Plant Conservation asserts that "without plants, there is no life".[91] It aims to "halt the continuing loss of plant diversity" throughout the world.[91]


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