Bromus catharticus |
Bromus anomalus |
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rescue brome, rescue grass, rescuegras |
Mexican brome |
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Habit | Plants annual, biennial, or perennial; loosely cespitose or tufted. | Plants perennial; not rhizomatous. | ||||
Culms | 30-120 cm tall, 2-4 mm thick, erect or decumbent. |
40-90 cm, erect; nodes (3)4-7(8), these and the internodes pubescent or glabrous. |
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Sheaths | usually densely, often retrorsely, hairy, hairs sometimes confined to the throat; auricles absent; ligules 1-4 mm, glabrous or pilose, obtuse, lacerate to erose; blades 4-30 cm long, 3-10 mm wide, flat, glabrous or hairy on both surfaces. |
glabrous or pilose, midrib of the culm leaves abruptly narrowed just below the collar; auricles often present on the lower leaves; ligules to 1 mm, truncate; blades 14-22(26) cm long, to 6 mm wide, flat, glabrous or pilose, not glaucous. |
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Panicles | 9-28 cm, usually open, erect or nodding; lower branches shorter than 10 cm, 1-4 per node, spreading or ascending, with up to 5 spikelets variously distributed. |
10-20 cm, open, nodding; branches ascending or spreading. |
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Spikelets | (17)20-40 mm, shorter than at least some pedicels and branches, elliptic to lanceolate, strongly laterally compressed, not crowded or overlapping, with 4-12 florets. |
(14)15-30 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 4-12 florets. |
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Glumes | smooth or scabrous, glabrous or pubescent; lower glumes 7-12 mm, 5-7(9)-veined; upper glumes 9-17 mm, 7-9(11)-veined, shorter than the lowest lemma; lemmas 11-20 mm, lanceolate, laterally compressed, strongly keeled, usually glabrous, sometimes pubescent distally, smooth or scabrous, 9-13-veined, veins often raised and riblike, margins sometimes conspicuous, hyaline, whitish or partly purplish, apices entire or toothed, teeth acute, shorter than 1 mm; awns absent or to 10 mm; anthers 0.5-1 mm in cleistogamous florets, 2-5 mm in chasmogamous florets. |
usually pubescent, rarely glabrous; lower glumes 5-6 mm, 1-3-veined; upper glumes 6-8 mm, 3-veined, sometimes mucronate; lemmas 7-10 mm, elliptic to lanceolate, rounded over the midvein, backs and margins pubescent, apices acute to obtuse, entire; awns 1-3(5) mm, straight, arising less than 1.5 mm below the lemma apices; anthers 2-4 mm. |
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2n | = 42. |
= 14. |
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Bromus catharticus |
Bromus anomalus |
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Distribution |
AL; AR; AZ; CA; CO; DC; FL; GA; IA; IL; KS; KY; LA; MD; MO; MS; NC; ND; NE; NJ; NM; NV; NY; OH; OK; OR; PA; SC; SD; TN; TX; UT; VA; HI; AB; NF; ON
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NM; TX; AB; BC; SK |
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Discussion | Bromus anomalus grows on rocky slopes in western Texas and adjacent Mexico. Many records of this species in the Flora region are here treated as B. porteri, a closely related species that has sometimes been included in B. anomalus. The main difference is that B. anomalus has auricles, and culm leaves with midribs that are narrowed just below the collar. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 24, p. 199. | FNA vol. 24, p. 213. | ||||
Parent taxa | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Ceratochloa | Poaceae > subfam. Pooideae > tribe Bromeae > Bromus > sect. Bromopsis | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Ceratochloa unioloides, B. willdenowii, B. unioloides | |||||
Name authority | Vahl | Rupr. ex E. Fourn. | ||||
Web links |
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