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The Collaborative International Dictionary

Monocotyledon \Mon`o*cot`y*le"don\, n. [Mono- + cotyledon: cf. F. monocotyl['e]done.] (Bot.) A plant with only one cotyledon, or seed lobe; a member of the Monocotyledonae.

Note: The plural, monocotyledons, is used as the name of a large class of plants (the Monocotyledones, or Monocotyledonae), and is generally understood to be equivalent to the term endogens.


n. (context botany English) Any plant whose seedlings typically have one cotyledon (seed leaf) (in contrast to the two cotyledons typical of dicots), thereby belonging to the taxonomic monocots, formerly variously known as ''(taxlink Monocotyledones class noshow=1)'', ''(taxlink Monocotyledonae class noshow=1)'', or Liliopsida, a class in the Angiospermae, the flowering plants. This group include the grasses, lilies, orchids and palms.


n. a monocotyledonous flowering plant; the stem grows by deposits on its inside [syn: monocot, liliopsid, endogen]


Monocotyledons , commonly referred to as monocots, ( Lilianae sensu Chase & Reveal) are flowering plants (angiosperms) whose seeds typically contain only one embryonic leaf, or cotyledon. They constitute one of the major groups into which the flowering plants have traditionally been divided, the rest of the flowering plants having two cotyledons and therefore classified as dicotyledons, or dicots. However, molecular phylogenetic research has shown that while the monocots form a monophyletic group or clade (comprising all the descendants of a common ancestor), the dicots do not. Monocots have almost always been recognized as a group, but with various taxonomic ranks and under several different names. The APG III system of 2009 recognises a clade called "monocots" but does not assign it to a taxonomic rank.

The monocots include about 60,000 species. The largest family in this group (and in the flowering plants as a whole) by number of species are the orchids (family Orchidaceae), with more than 20,000 species. About half as many species belong to the true grasses ( Poaceae), who are economically the most important family of monocots. In agriculture the majority of the biomass produced comes from monocots. These include not only major grains ( rice, wheat, maize, etc.), but also forage grasses, sugar cane, and the bamboos. Other economically important monocot crops include various palms ( Arecaceae), bananas ( Musaceae), gingers and their relatives, turmeric and cardamom ( Zingiberaceae), asparagus and the onions and garlic family ( Amaryllidaceae). Additionally most of the horticultural bulbs, plants cultivated for their blooms, are monocots, such as lilies, daffodils, irises, amaryllis, cannas, bluebells and tulips.

Usage examples of "monocotyledon".

Dicotyledons and amongst Monocotyledons, together with several Cryptogams, have now been described.