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The monocots or monocotyledons have, as the name implies, a single (mono-) cotyledon, or embryonic leaf, in their seeds.Historically, this feature was used to contrast the monocots with the dicotyledons or dicots which typically have two cotyledons; however, modern research has shown that the dicots are not a natural group, and the term can only be used to indicate all angiosperms that are not ...
Angiosperms 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. [8] They include all forbs (flowering plants without a woody stem), grasses and grass-like plants, a vast majority of broad-leaved trees, shrubs and vines, and most aquatic plants.
A middle Devonian (385-million-year-old) precursor to seed plants from Belgium has been identified predating the earliest seed plants by about 20 million years. Runcaria, small and radially symmetrical, is an integumented megasporangium surrounded by a cupule.
Andropogon (common names: beard grass, bluestem grass, broomsedge) is a widespread genus of plants in the grass family, native to much of Asia, Africa, and the Americas, as well as Southern Europe and various oceanic islands.
Andropogon virginicus is a perennial grass forming narrow clumps of stems up to just over a meter in maximum height (around 3 feet 3 inches). Its stems and leaves are green when new, turning purplish to orange and then straw-colored with age. It produces large amounts of seeds small enough to disperse on the wind. This grass is successful in a ...
Flower of Liriodendron tulipifera, a Mesangiosperm. Mesangiospermae is a clade that contains the majority of flowering plants (angiosperms). Mesangiosperms are therefore known as the core angiosperms, in contrast to the three orders of earlier-diverging species known as the basal angiosperms: Nymphaeales (including water lilies), Austrobaileyales (including star anise), and Amborellales.
The seeds of E. angustifolium are adapted to wind-dispersal. Eriophorum angustifolium is a hardy , herbaceous , rhizomatous , perennial plant , [ 14 ] meaning that it is resilient to cold and freezing climatic conditions, dies back at the end of its growing season , has creeping rootstalks, and lives for over two years.
Cross section of Williamsonia harrisiana (India, Jurassic - Early Cretaceous). The monosporangiate [2] female Williamsonia seed cone (sometimes described as a "flower" though this does not imply homology with angiosperm flowers [3]) consists of an ovulate receptacle enclosed by bracts (modified leaves), with the receptacle bearing sporophylls with terminal seeds/ovules, which are surrounded by ...