Panicum hirticaule |
Panicum ghiesbreghtii |
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Mexican panicgrass, roughstalk witchgrass, roughstalk wltchgrass, woodland panic |
Ghiesbreght's panicgrass, Ghiesbreght's witchgrass |
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Habit | Plants annual; glabrous or hispid, hairs papillose-based. | Plants perennial; cespitose. | ||||||||
Culms | 11-110 cm, erect to decumbent; nodes shortly hirsute or glabrous. |
40-120 cm tall, 2-3 mm thick, decumbent to erect, branching from the base and the middle nodes; nodes pilose, hairs spreading; internodes hirsute, hairs papillose-based. |
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Sheaths | shorter than the internodes, greenish to purplish, glabrous or with papillose-based hairs, ciliate on 1 margin, glabrous on the other; collars hirsute; ligules 1.5-3.5 mm, of hairs; blades 3-30 cm long, 3-30 mm wide, flat, usually hirsute or sparsely pubescent, hairs papillose-based, sometimes glabrous, bases rounded to cordate-clasping, margins ciliate, cilia papillose-based, apices acute. |
usually shorter than the internodes, hirsute, lower sheaths more so than those above, hairs papillose-based; collars densely pilose; ligules 0.5-4 mm; blades 16-55 cm long, 0.5-14 mm wide, erect to ascending, abaxial surfaces hirsute, hairs papillose-based, adaxial surfaces densely pilose, midveins prominent and whitish, bases truncate, margins ciliate basally, apices attenuate. |
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Panicles | 9-30 cm long, 5-8 cm wide, erect or nodding, partially included to well-exserted, rachises glabrous or sparsely hispid basally; primary branches usually alternate to opposite, divergent, secondary branches and pedicels confined to the distal 2/3; pulvini inconspicuous; secondary branches appressed; pedicels 9-27 mm, appressed. |
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Spikelets | 1.9-4 mm long, 0.8-1 mm wide, ovoid to almost spherical, often reddish-brown, glabrous, veins prominent, scabridulous, apices abruptly acuminate. |
2.6-3.4 mm long, 0.9-1.2 mm wide, ovoid, glabrous. |
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Lower glumes | 1.3-2.4 mm, 1/2 - 3/4 as long as the spikelets, 3-5-veined; upper glumes 1.8-3.3 mm, 7-11-veined; lower florets sterile; lower lemmas similar to the upper glumes, 9-veined; lower paleas 0.4-0.9 mm; upper florets 1.5-2.4 mm long, 0.4-0.8 mm wide, ellipsoid, smooth or conspicuously papillate, shiny, stramineous, often with a lunate scar at the base. |
1.4-1.7 mm, to 1/2 as long as the spikelets, acute, 5-7-veined; upper glumes and lower lemmas similar, exceeding the upper florets by 0.7-0.9 mm, 9-13-veined; lower florets sterile; lower paleas 0.5-1.3 mm; upper lorets 1.7-2.3 mm long, 0.8-1.1 mm wide, smooth, ovoid. |
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Terminal | panicles 7-35 cm long, 5-23 cm wide, about 1/2 as wide as long, shortly exerted or partially included, lax, open; axillary panicles smaller, included basally; primary branches diverging, lower branches solitary, upper branches solitary to subverticillate; secondary branching primarily in the distal 1/3; pedicels 1-4 mm, clavate, spreading to appressed. |
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2n | = unknown. |
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Panicum hirticaule |
Panicum ghiesbreghtii |
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Distribution |
AZ; CA; NM; NV; OK; TX; WA
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TX; PR |
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Discussion | Panicum hirticaule grows in rocky or sandy soils in waste places, roadsides, ravines, and wet meadows along streams. Its range extends from southeastern California and southwestern Texas southward through Mexico, Central America, Cuba, and Hispaniola to western South America and Argentina. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Panicum ghiesbreghtii grows in low, moist ground, wet thickets, and savannahs, from southern Texas through Mexico, Central America, Cuba, and the West Indies to northern South America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 25, p. 460. | FNA vol. 25, p. 466. | ||||||||
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Panicum > sect. Panicum | Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Panicum > sect. Panicum | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | P. pampinosum | |||||||||
Name authority | J. Presl | E. Fourn. | ||||||||
Web links |