Panicum urvilleanum

Kunth
Common names: Silky panicgrass
Treatment appears in FNA Volume 25. Treatment on page 475.

Plants perennial. Culms 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. Sheaths densely villous; ligules membra¬nous, 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. Panicles 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. Spikelets 5-7 mm, densely villous, hairs silvery or tawny-white. Lower glumes 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. 2n = 36.

Discussion

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.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."elongated" is not a number."-11-veined" is not declared as a valid unit of measurement for this property.

... more about "Panicum urvilleanum"
puberulent +
anatomy +  and kranz +
Robert W. Freckmann +  and Michel G. Lelong +
1 (?) +  and 3 (?) +
keeled +  and rounded +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
disarticulating +  and pseudopetiolate +
non-radiate +  and radiate +
20 cm200 mm <br />0.2 m <br /> (60 cm600 mm <br />0.6 m <br />) +
strigose +  and subglabrous +
tapering +
4mm;10mm +
spikelike +
slender +
not developed +
terete +  and compressed +
thick-walled +
sometimes longer +
Silky panicgrass +
small green +
branching +  and simple +
not compressed +
50 cm500 mm <br />0.5 m <br /> (100 cm1,000 mm <br />1 m <br />) +
woody +  and hard +
Calif. +  and Ariz. +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
pubescent +  and glabrous +
tuberculate +
unequal +
membranous +
well-developed +
white +, tawny-white +  and silvery +
uncinate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Oval (?) +  and Round (?) +
bracteate +  and ebracteate +
hollow +  and solid +
coriaceous +
membranous +
inconspicuous +
(5)7-9(11)-veined +
acuminate +, acute +  and truncate +
complex +  and simple +
concealed +  and prominent +
2 +  and 1 +
20cm +  and 30cm +
subterranean +
pyramidal +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
simple +  and compound +
dry +  and fleshy +
creeping +  and vertical +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
not keeled +
in triplets +  and paired +
1 +  and 60 +
unisexual +  and bisexual +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Gramineae +
Panicum urvilleanum +
Panicum sect. Urvilleana +
species +
membranous +
stipitate +  and sessile +
rugose +  and verrucose +
chartaceous-indurate +  and rigid +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +