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Bromus

(Genus)

Overview

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Annuals or perennials. Culms erect, tufted or with rhizomes. Leaf sheaths cl osed; leaf blades linear, usually flat; ligules membranous. Panicles spreading or contracted, branches scabrid or pubescent, elongated or arched. Spikelets large, with 3 to many florets, upper florets often sterile; rachilla disarticulating above glumes and between florets, scabrid or shortly hairy; glumes unequal or subequal, shorter than spikelet, lanceolate or nearly ovate, (1-) 5-7-veined, apex acute or long acuminate or aristiform; floret callus glabrous or both sides thinly hairy; lemmas rounded on back or compressed to keel, 5-9(-11) -veined, herbaceous or nearly leathery, margins often membranous, apex entire or 2-toothed; awn terminal or arising from lemma between teeth slightly under apex, rarely awnless or 3-awned; palea narrow, usually shorter than lemma, keels ciliate or scabrid. Lodicules 2. Stamens 3. Ovary apex with appendage; styles 2, arising from lower front of appendage. Caryopsis oblong, apex hairy, adaxial surface sulcate. Chromosomes large, x = 7, 2n = 14, 28, 42, 56, 70.

About 150 species: temperate regions, mainly in the N hemisphere, also on mountains in the tropics; 55 species (eight endemic, at least three introduced) in China.[1]

Photos

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Taxonomy

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The Genus Bromus is further organized into finer groupings including:

Footnotes

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  1. Liang Liu, Guanghua Zhu & Klaus Ammann "Bromus". in Flora of China Vol. 22 Page 370, 371. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org.

Sources

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Last Revised: September 22, 2009
2009/09/22 16:40:23