Poaceae

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Dissection of
Bromus catharticus

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Bromus L. Brome
Plants hermaphroditic, caespitose or rhizomatous, annual or perennial. Culms erect or ascending or decumbent or geniculate, glabrous or pubescent or hairy; internodes hollow, terete. Leaves basal and cauline, not distichous; sheaths terete, margins connate; auricles absent; ligules membranous; blades flat, lax. Panicles or rarely racemes open or narrow or contracted; primary branches spreading or ascending or appressed. Spikelets solitary, terete or laterally compressed; disarticulation above the glumes; awned or awnless, pedicellate; florets 3- 20, reduced floret at apex, callus glabrous; glumes 2, 1-5-veined, unequal, shorter than first floret, glabrous or pubescent, awnless; lemmas 5-13-veined (not distinct), membranous or subcoriaceous, glabrous to hairy, bifid or entire (rarely), awnless or more frequently 1-awned from between lobes or teeth of a bifid apex, awns straight or divergent or wavy; paleas 2-veined, adnate or not adnate to caryopses, awnless, ciliate. Stamens 1-3; anthers yellow. Caryopses laterally compressed with tuft of hair at apex. Base chromosome number x=7.

A genus of about 100 species generally from temperate regions of the world. Bromes are important livestock forages. Some taxa are introduced weeds from Europe e.g. B. catharticus, B. diandrus, B. hordeaceus, B. japonicus, B. tectorum etc. Other species are introduced pasture species e.g. B. inermis. This genus is taxonomically difficult.