Panicum hirticaule |
Panicum sect. Panicum |
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Mexican panicgrass, roughstalk witchgrass, roughstalk wltchgrass, woodland panic |
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Habit | Plants annual; glabrous or hispid, hairs papillose-based. | Plants annual or perennial; perennials usually cespitose, sometimes shortly rhizomatous. | ||||||||
Culms | 11-110 cm, erect to decumbent; nodes shortly hirsute or glabrous. |
2-300 cm, erect or decumbent, not succulent, sometimes almost woody at the base, often branching from the lower nodes. |
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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. |
not compressed. |
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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. |
usually lax and diffuse; pedicels divergent. |
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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. |
ellipsoid to lanceoloid, 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. |
(1/3)1/2 - 3/4 as long as the spikelets, (3)5-7-veined, truncate, obtuse, acute, or acuminate; lower paleas present or absent. |
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Panicum hirticaule |
Panicum sect. Panicum |
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Distribution |
AZ; CA; NM; NV; OK; TX; WA
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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 sect. Panicum includes approximately 22 species and extends from the southern United States to Argentina. Most species grow in dry, open places, but a few grow in moist sites such as river banks. (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. 456. | ||||||||
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Panicum > sect. Panicum | Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Panicum | ||||||||
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Subordinate taxa | ||||||||||
Synonyms | P. pampinosum | |||||||||
Name authority | J. Presl | unknown | ||||||||
Web links |