Compositae, a family of Magnolia and Chrysanthemum[7], there are about 1000 genera, 25000~30000 speciesDicotyledonThe first major subject of.It is widely distributed all over the world and less in the tropics.There are more than 200 genera and more than 2000 species in China, which are distributed throughout the country.According to the different types of corolla of the head and the presence or absence of milk, it can be generally divided into two subfamilies: Tubular subfamily and Tongue subfamily.[1]Sepals are undeveloped and usually form scaly, bristly or hairy crowns;The corolla is usually radially symmetric, tubular, or left-right symmetric, two lipped, or tongue shaped, and the capitulum is discoid or radial, with isomorphic florets, all of which are tubular flowers or tongue shaped flowers, or heteromorphic florets, that is, female flowers are on the periphery, tongue shaped, and bisexual tubular flowers are in the center;Stamens 4-5, inserted on corolla tube, anthers inward, connate into a tube, base obtuse, acute, halberd shaped or caudate.[4]
Widely distributed all over the world, but less in the tropics.There are more than 200 genera and more than 2000 species in China, which are produced all over the country.Compositae plants like to grow in forest edges, shrubs, alpine grasslands, meadows, fields, wasteland, roadside and other places.In addition, compositae plants can also be found near the snow line at an altitude of 5000m, such as snow lotus growing on the Himalayas.
It has a wide range of economic uses, for medicinal or ornamental purposes.Compositae plants are closely related to human beings. In addition to their well-known ability to beautify the environment, provide people with appreciation, and produce daily chemical products and industrial raw materials, they also have other important economic values.[1][5]
Herbs, subshrubs orshrub, rare trees.SometimesLactiferous ductorResin channel。Leaves usually alternate, sparsely opposite or whorled, entire or dentate or divided, without stipules, or sometimes the petiole base expands into stipules.
The flowers are bisexual or unisexual, rarely have unisexual heteroecious plants, neat or symmetrical, five cardinal numbers, a few or most of them are clustered into heads or short spikes, surrounded by involucres composed of one or more layers of involucres;The head is solitary or several to many arranged in racemose, umbellate, corymbose or panicle;Inflorescence stipules flat or convex, with or without pits, glabrous or hairy;With or without supporting plate;Sepals are undeveloped and usually form scaly, bristly or hairy crowns;The corolla is usually radially symmetric, tubular, or left-right symmetric, two lipped, or tongue shaped, and the capitulum is discoid or radial. There are isomorphic florets, all of which are tubular flowers or tongue shaped flowers, or there are heteromorphic florets, that is, female flowers are on the periphery, tongue shaped, and bisexual tubular flowers are in the center.
Stamens 4-5, inserted on corolla tube, anthers inward, connate into a tube, base obtuse, acute, halberd shaped or caudate;The upper end of the style is bifid, and the upper end of the style branch has appendages or no appendages;Ovary inferior, 2 connate carpels, 1-locular, with 1 erect ovule;Fruit an indehiscent achene;Seeds without endosperm, with 2, sparse 1 cotyledon.[2]
Growth environment
Announce
edit
the composite family
Compositae plants like to grow in forest edges, shrubs, alpine grasslands, meadows, fields, wasteland, roadside and other places.
Distribution range
Announce
edit
the composite family
There are about 1000 genera and 25000 to 30000 species of undergraduate, which are widely distributed all over the world, and few in the tropics.There are more than 200 genera and more than 2000 species in China, which are produced all over the country.[2]
Key values
Announce
edit
Compositae has a wide variety, many of which are rich in economic value, such as lettuce, lettuce, chrysanthemum, jerusalem artichoke and other vegetables;The seeds of sunflower, sunflower seed and xanthium sibiricum can be pressed for oil for food or industrial use;Rubber can be extracted from Hevea brasiliensis and Chrysanthemum argyrophyllum;Blumea balsamifera can be distilled to make borneol;Safflower andWhite flower pyrethrumIt is a famous insecticide;Eupatorium, Aster, Convolvulus, Tianmingjing, Artemisia scoparia, Artemisia argyi, Atractylodes macrocephala, Arctium lappa, safflower, dandelion, etc. are important medicinal plants;In addition, chrysanthemums, kingfishers, dahlias, goldenrods, goldenrods and many other kinds of flowers are beautiful and bright for viewing, and are cultivated in gardens all over the world.[2]
Protection status
Announce
edit
the composite family
Included in Appendix I, Appendix II and Appendix III of the Convention on International Trade in Endangered Species of Wild Fauna and Flora。[3]
