Panicum anceps
Panicum urvilleanum
beak panicgrass
desert panicgrass, silky panic grass
30-130 cm, terete to slightly compressed.
50-100 cm, erect, solitary or in small tufts from stout, scaly, creeping to vertical rhizomes or stolons, simple or branching at the base;
nodes densely villous.
laterally compressed, glabrous or sparsely to densely pilose or villous, especially at the summit;
ligules less than 0.5 mm, membranous, erose, often brownish;
blades 10-50 cm long, 4-12 mm wide, erect, adaxial surfaces pilose at least basally, glabrous or pilose abaxially.
densely villous;
ligules membranous, ciliate, hairs 1.5-2 mm;
blades 20-60 cm long, 4-10 mm wide, ascending to spreading, strigose to subglabrous, flat basally, tapering to a long, involute point.
10-40 cm, 1/4 - 2/3 as wide as long, well-exserted at anthesis;
branches relatively few, stiffly spreading or ascending; ultimate branchlets 1-sided;
pedicels 0.1-3 mm, scabridulous to scabrous, appressed.
20-30 cm long, 3-9 cm wide, narrow, shortly exserted;
branches slender, ascending;
secondary branches and pedicels 1-4 mm, crowded, ascending to appressed.
2.3-3.9 mm, narrowly ellipsoid to ovoid, usually subsessile, usually pale to yellowish-green, glabrous, often falcate and gaping at the apices, rarely lanceolate, densely crowded on short, appressed branchlets, set obliquely on short pedicels.
5-7 mm, densely villous, hairs silvery or tawny-white.
A-A as long as the spikelets, 3-veined, keels scabrous, apices acute;
upper glumes and lower lemmas subequal, keeled, beaked, usually gaping at the apices;
lower florets sterile;
lower paleas subequal to the lower lemmas;
upper florets 1.5-2.2 mm long, about 1 mm wide, 2/5 – 3/4 as long as the spikelets, apices with a tuft of minute, thick hairs;
upper lemmas thick, stiff, clasping the upper paleas throughout their length.
about 3/4 the length of the spikelets, 7-11-veined;
upper glumes and lower lemmas 7-15-veined;
lower florets staminate;
lower paleas about as long as the lower lemmas;
upper florets striate, margins of the upper lemmas villous, hairs white;
lodicules very large.
= 18, 36.
= 36.
Panicum anceps
Panicum urvilleanum
Panicum anceps grows in low, moist, primarily sandy areas, pine savannahs, the borders of flood-plain swamps, mesic woodlands, roadsides, and upland pine-hardwood forests. It is restricted to the United States.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Panicum urvilleanum grows on desert sand dunes and in creosote bush scrubland in the Mojave and Colorado desert regions of southern California, southern Nevada, and western Arizona. It also grows in Peru, Chile, and Argentina.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Spikelets 2.7-3.9 mm long, often clearly falcate; rhizomes relatively short and stout | subsp. anceps |
1. Spikelets 2.3-2.8 mm long, not clearly falcate; rhizomes relatively long and slender | subsp. rhizomatum |
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