Bromus arenarius |
Bromus briziformis |
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Australian brome, Australian chess |
rattlesnake brome, rattlesnake chess, rattlesnake grass |
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Habit | Plants annual. | Plants annual. |
Culms | 20-40 cm, erect to ascending. |
20-62 cm, erect or ascending. |
Sheaths | densely retorsely pilose; ligules 1.5-2.5 mm, glabrous or pilose, obtuse, lacerate; blades 7-8 cm long, 3-6 mm wide, pilose on both surfaces. |
densely pilose; ligules 0.5-2 mm, hairy, obtuse, erose; blades 3-13 cm long, 2-4 mm wide, pilose to pubescent on both surfaces. |
Panicles | (4)10-15 cm long, 4-7 cm wide, open, nodding; branches sometimes longer than the spikelets, spreading or ascending, sinuous. |
5-15 cm long, 3-7 cm wide, open, secund, nodding; branches sometimes longer than the spikelets, curved to reflexed. |
Spikelets | 10-20 mm, lanceolate, terete to moderately laterally compressed; florets 5-9(11), bases concealed at maturity; rachilla internodes concealed at maturity. |
15-27 mm long, 8-12 mm wide, ovate, laterally compressed; florets 7-15, bases concealed at maturity; rachilla internodes concealed at maturity. |
Glumes | densely pilose; lower glumes 7-10 mm, 3-veined; upper glumes 8-12 mm, (5)7-veined; lemmas 9-11(13) mm long, 1-1.8 mm wide, lanceolate, densely pilose, distinctly 7-veined, rounded over the midvein, margins rounded, not inrolled at maturity, apices acute, bifid, teeth shorter than 1 mm; awns 10-16 mm, straight to weakly spreading, arising 1.5 mm or more below the lemma apices; anthers 0.7-1 mm. |
smooth or scabridulous; lower glumes 5-6 mm, 3-5-veined; upper glumes 6-8 mm, 7-9-veined; lemmas 9-10 mm long, 6-8 mm wide, inflated, obovate or rhombic, coriaceous, smooth or scabridulous, obscurely 9-veined, rounded over the midvein, margins hyaline, 1-1.3 mm wide, abruptly angled, not inrolled at maturity, apices acute to obtuse, bifid, teeth shorter than 1 mm; awns usually absent, sometimes to 1 mm, arising less than 1.5 mm below the lemma apices; anthers 0.7-1 mm. |
Caryopses | equaling or shorter than the paleas, thin, weakly inrolled. |
equaling or shorter than the paleas, thin, weakly inrolled or flat. |
2n | = unknown. |
= 14. |
Bromus arenarius |
Bromus briziformis |
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Distribution |
AZ; CA; NV; OR; PA
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AK; CA; CO; CT; DE; ID; IL; IN; MA; MD; MI; MT; ND; NE; NJ; NM; NV; NY; OH; OR; PA; SD; UT; VT; WA; WY; BC; ON
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Discussion | Bromus arenarius grows in dry, often sandy slopes, fields, and waste places. Native to Australia, it is now widely scattered throughout California, and is also recorded from Oregon, eastern Nevada, Arizona, New Mexico, Texas, and Pennsylvania. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Bromus briziformis grows in waste places, road verges, and overgrazed areas. It is native to southwest Asia and Europe, and is adventive in the Flora region, occurring from southern British Columbia to as far south as New Mexico, and in scattered locations eastward. The unique shape of its spikelets has led to its use in dried flower arrangements and as a garden ornamental. The common name may refer to the similarity of the spikelets to a rattlesnake's tail. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 235. | FNA vol. 24, p. 228. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromus | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromus |
Sibling taxa | ||
Synonyms | B. brizaeformis | |
Name authority | Labill. | Fisch. & C.A. Mey. |
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