Bromus japonicus |
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Australian brome, hairy chess, Japanese brome, Japanese bromegrass, Japanese chess |
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Habit | Plants annual. |
Culms | (22)30-70 cm, erect or ascending. |
Sheaths | usually densely pilose; upper sheaths sometimes pubescent or glabrous; ligules 1-2.2 mm, pilose, obtuse, lacerate; blades 10-20 cm long, 2-4 mm wide, usually pilose on both surfaces. |
Panicles | 10-22 cm long, 4-13 cm wide, open, nodding; branches usually longer than the spikelets, ascending to spreading or somewhat drooping, slender, flexuous, sometimes sinuous, often with more than 1 spikelet. |
Spikelets | 20-40 mm, lanceolate, terete to moderately laterally compressed; florets 6-12, bases concealed at maturity; rachilla internodes concealed at maturity. |
Glumes | smooth or scabrous; lower glumes 4.5-7 mm, (3)5-veined; upper glumes 5-8 mm, 7-veined; lemmas 7-9 mm long, 1.2-2.2 mm wide, lanceolate, coriaceous, smooth proximally, scabrous on the distal 1/2, obscurely (7)9-veined, rounded over the midvein, margins hyaline, 0.3-0.6 mm wide, obtusely angled above the middle, not inrolled at maturity, apices acute, bifid, teeth shorter than 1 mm; awns 8-13 mm, strongly divergent at maturity, sometimes erect, twisted, flattened at the base, arising 1.5 mm or more below the lemma apices; anthers 1-1.5 mm. |
Caryopses | equaling or shorter than the paleas, thin, weakly inrolled or flat. |
2n | = 14. |
Bromus japonicus |
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Distribution | |
Discussion | Bromus japonicus grows in fields, waste places, and road verges. It is native to central and southeastern Europe and Asia, and is distributed throughout much of the United States and southern Canada, with one record from the Yukon Territory. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 235. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromus |
Sibling taxa | |
Synonyms | B. japonicus var. porrectus |
Name authority | Thunb. |
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