Panicum hallii |
Panicum mohavense |
|||||
---|---|---|---|---|---|---|
Hall panicum, Hall's panic, Hall's panicgrass, Hall's panicum, Hall's witchgrass |
Mohave witchgrass, Mojave panicgrass |
|||||
Habit | Plants perennial; cespitose. | Plants annual. | ||||
Culms | 10-100 cm, 2-10 mm thick, erect, simple or sparingly branched basally; nodes sericeous, pilose or glabrous; internodes usually glaucous. |
2-8 cm, erect-spreading; nodes 1-2, hispid; internodes pilose, hairs papillose-based. |
||||
Sheaths | rounded, much longer than the internodes, with prominent veins, hispid, hairs papillose-based; ligules 0.2-0.4 mm, membranous, ciliate; blades 1-4 cm long, 1-3 mm wide, flat or involute apically, glabrous basally, margins ciliate, cilia papillose-based. |
|||||
Leaves | often crowded basally; sheaths rounded, glabrous or hirsute, hairs fragile, papillose-based, margins sometimes ciliate distally; ligules 0.6-2 mm; blades 4-23 cm long, 1-10 mm wide, erect to spreading, flat or sometimes involute (on sterile branches), often curling at maturity, glaucous, abaxial surfaces sometimes with prominent papillae along the midribs, bases rounded or narrowing to the sheaths, margins cartilaginous, ciliate basally, scabridulous elsewhere, apices acute. |
|||||
Panicles | congested, partially included in the sheaths, less than 1.5 times longer than wide; branches ascending, narrow; primary branches appressed to the main axes, secondary branches and pedicels attached to the distal 2/3; pedicels appressed, 1-2 mm. |
|||||
Spikelets | 2.1-4.2 mm long, 0.8-1 mm wide, usually ovoid, glabrous. |
2-2.2 mm long, 1-1.3 mm wide, plump-ellipsoid, glabrous. |
||||
Lower glumes | 1.2-2.4 mm, 1/2 - 3/4 as long as the spikelets, attenuate; upper glumes and lower lemmas similar, 7-11-veined, acuminate, extending 0.3-1.2 mm beyond the upper florets; lower florets sterile; lower paleas 0.8-2 mm; upper florets 1.5-2.4 mm long, 0.7-1.2 mm wide, ovoid to ellipsoid, smooth, nigrescent. |
1.2-1.3 mm, acute to attenuate; upper glumes and lower lemmas 2-2.2 mm, 7-9-veined, apices purplish, acute; lower florets sterile; lower paleas 0.2-0.4 mm; upper florets 1.4-1.8 mm long, about 1 mm wide, broadly ovoid. |
||||
Terminal | panicles 7-31 cm long, 3-15 cm wide; rachises glabrous, tending to break at maturity; branches usually alternate, slender, stiff, ascending to divergent; pedicels 1-15 mm, appressed. |
|||||
2n | = 18. |
|||||
Panicum hallii |
Panicum mohavense |
|||||
Distribution |
AZ; CO; LA; NM; OK; TX; UT
|
AZ; NM |
||||
Discussion | Panicum hallii grows on sandy, gravelly, or rocky land, including roadsides, pastures, rangeland, oak and pine savannahs, chaparral, and moist areas in deserts and on mesas. Its range extends from the southwestern United States to southern Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Panicum mohavense is known only from arid limestone terraces in Arizona and New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||
Key |
|
|||||
Source | FNA vol. 25, p. 466. | FNA vol. 25, p. 462. | ||||
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. lepidulum | |||||
Name authority | Vasey | Reeder | ||||
Web links |