familyPoaceae
subfamilyPoaceae subfam. Panicoideae
tribePoaceae tribe Paniceae
genusPanicum
subgenusPanicum subg. Panicum
sectionPanicum sect. Urvilleana
speciesPanicum urvilleanum

Panicum urvilleanum

Kunth
Robert W. Freckmann, Michel G. Lelong
Common names: Silky panicgrass
Treatment appears in FNA Volume 25. Treatment on page 475.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché, Linda A. Vorobik

Copyright: Utah State University

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.

Distribution

Calif., Ariz.

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

... more about "Panicum urvilleanum"
RDF feed
2n chromosome quantity
36 +
Abaxial ligule presence
absent +
Abaxial ligule quantity
common +
Adaxial cell presence
absent +
Adaxial cell shape
bulliform +
Adaxial ligule architecture or pubescence or shape
ciliate +
Adaxial ligule presence
absent +
Adaxial ligule texture
membranous +
Anther quantity
3 +
Apex architecture
gaping +
Apex architecture or shape
apiculate +
Apex pubescence
puberulent +
Apex shape
acute +
Arm cell presence
absent +
Arm cell quantity
anatomy +  and kranz +
Auricle presence
absent +
Author
Robert W. Freckmann +  and Michel G. Lelong +
Authority
Kunth +
Awn atypical quantity
1 (?) +  and 3 (?) +
Awn orientation
arising +
Awn quantity
single +
Back shape
keeled +  and rounded +
Base architecture
sulcate +
Base architecture or shape
cormlike +
Base arrangement
divergent +  and parallel +
Base position
intravaginal +, extravaginal +, branching +  and basal +
Base size
swelling +
Base texture
membranous +
Base width
thick +
Blade architecture
disarticulating +  and pseudopetiolate +
Blade architecture or arrangement
non-radiate +  and radiate +
Blade length
20 cm200 mm <br />0.2 m <br /> (60 cm600 mm <br />0.6 m <br />) +
Blade length or size
long +
Blade orientation
Ascending (?) +  and Spreading (?) +
Blade position
adaxial +
Blade prominence or shape
flat +
Blade pubescence
strigose +  and subglabrous +
Blade quantity
4 +
Blade shape
tapering +
Blade width
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Branch architecture
secund +
Branch orientation
ascending +
Branch presence
absent +
Branch reproduction
sterile +
Branch shape
spikelike +
Branch size
slender +
Branch some measurement
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Bristle presence
absent +
Bristle reproduction
sterile +
Callus development
not developed +
Caryopsis architecture or pubescence or relief
smooth +
Caryopsis architecture or shape
cleft +
Caryopsis presence
absent +
Caryopsis shape
terete +  and compressed +
Cell architecture
thick-walled +
Cell arrangement
arranged +
Cell position relational
surrounded +
Cell quantity
2;6 +
Cilium length or size
sometimes longer +
Common name
Silky panicgrass +
Crest coloration
small green +
Cross-section quantity
4 (?) +
Culm architecture
branching +  and simple +
Culm architecture or arrangement or growth form
in small tufts +  and solitary +
Culm duration
annual +
Culm growth form
climbing +
Culm growth form or location
floating +
Culm growth form or orientation
decumbent +
Culm growth form or texture
herbaceous +
Culm orientation
erect +
Culm shape
not compressed +
Culm some measurement
50 cm500 mm <br />0.5 m <br /> (100 cm1,000 mm <br />1 m <br />) +
Culm texture
woody +  and hard +
Distal cell length or size
long +
Distal cell size or width
narrow +
Distribution
Calif. +  and Ariz. +
Embryo quantity
1/2 +
Embryo shape
waisted +
Embryo size
large +
Endosperm texture
hard +
Filament shape
capillary +
Flap character
germination +
Floret architecture
pistillate +  and staminate +
Floret arrangement
adjacent +
Floret atypical quantity
3 +
Floret length or size
sometimes longer +
Floret palea development
well-developed +
Floret palea presence
absent +
Floret palea size
reduced +
Floret quantity
2 +
Floret reproduction
bisexual +
Floret shape
compressed +  and terete +
Floret size
plump +
Fusoid cell presence
absent +
Glume architecture or function or pubescence
glandular +
Glume architecture or shape
awned +
Glume growth form or texture
herbaceous +
Glume height or length or size
shorter +
Glume length or size
shorter or longer +
Glume position
subtending +
Glume pubescence
pubescent +  and glabrous +
Glume quantity
2 +
Glume relief
tuberculate +
Glume size
unequal +
Glume texture
membranous +
Glume variability
equal +
Granum development
well-developed +
Hair architecture or shape
awned +
Hair coloration
white +, tawny-white +  and silvery +
Hair quantity
lacking +
Hair shape
uncinate +
Hair some measurement
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Hilum arrangement or course or shape
linear +
Hilum coloration or relief
punctate +
Hilum shape
Oval (?) +  and Round (?) +
Illustration
Present +
Illustration copyright
Utah State University +
Illustrator
Linda A. Vorobik +  and Cindy Roché +
Inflorescence architecture
bracteate +  and ebracteate +
Inflorescence position
axillary +
Inflorescence position or structure subtype
terminal +
Inner cell architecture
thick-walled +
Inner cell arrangement
arranged +
Inner cell position relational
surrounded +
Inner cell quantity
2;6 +
Inner outer sheath architecture
thick-walled +
Inner outer sheath arrangement
arranged +
Inner outer sheath position relational
surrounded +
Inner outer sheath quantity
2 (6) +
Inner outer thinner cell-wall architecture
thick-walled +
Inner outer thinner cell-wall arrangement
arranged +
Inner outer thinner cell-wall development
centripetal +
Inner outer thinner cell-wall position relational
surrounded +
Inner outer thinner cell-wall quantity
2 (6) +
Internode architecture
hollow +  and solid +
Internode length
elongated +
Internode texture
spongy +
Layer presence
absent +
Leaf arrangement
distichous +
Leaf margin arrangement
Overlapping (?) +
Leaf position
cauline +
Lemma architecture or shape
awned +
Lemma coloration
hyaline +
Lemma texture
coriaceous +
Ligule architecture or pubescence or shape
ciliate +
Ligule presence
absent +
Ligule texture
membranous +
Lodicule fusion
free +
Lodicule height or length or size
short +
Lodicule presence
absent +
Lodicule prominence
inconspicuous +
Lodicule pubescence
glabrous +
Lodicule quantity
2 +
Lodicule shape
cuneate +
Lodicule size
large +
Lodicule texture
fleshy +
Lower floret architecture
staminate +
Lower floret reproduction
sterile +
Lower floret size
reduced +
Lower glume architecture
(5)7-9(11)-veined +
Lower glume quantity
3/4 +
Lower glume shape
acuminate +, acute +  and truncate +
Lower glume size
minute +
Lower palea coloration
hyaline +
Lower palea height or length or size
shorter +
Lower palea presence
absent +
Margin arrangement
separated +
Margin coloration
hyaline +
Margin prominence or shape
flat +
Margin pubescence
villous +
Margin shape or vernation
involute +
Microhair presence
absent +
Midrib architecture
complex +  and simple +
Node prominence
concealed +  and prominent +
Node pubescence
villous +
Number of lower taxa
0 +
Other quantity
2 +  and 1 +
Ovary presence
absent +
Ovary pubescence
glabrous +
Palea architecture or fixation
clasping +
Palea shape
keeled +
Panicle architecture
condensed +
Panicle architecture or arrangement
lax +
Panicle condition or size
contracted +
Panicle density
diffuse +
Panicle length
20cm +  and 30cm +
Panicle location
subterranean +
Panicle position
exserted +
Panicle shape
pyramidal +
Panicle size or width
narrow +
Panicle variability
varying +
Panicle width
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
Papilla architecture
simple +  and compound +
Papilla presence
absent +
Pedicel arrangement
divergent +
Pedicel fixation or orientation
appressed +
Pedicel quantity
1 +
Pericarp arrangement
separating +
Pericarp condition or texture
dry +
Pericarp texture
dry +  and fleshy +
Pericarp width
thin +
Point shape or vernation
involute +
Rachis prominence
evident +
Reference
None +
Rhizome architecture or pubescence
scaly +
Rhizome fragility or size
stout +
Rhizome orientation
creeping +  and vertical +
Rosette season
winter +
Scar shape
lunate +
Secondary branch arrangement
crowded +
Secondary branch fixation or orientation
appressed +
Secondary branch height or length or size
short +
Secondary branch orientation
ascending;appressed +
Secondary branch presence
absent +
Secondary branch some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Secondary pedicel arrangement
crowded +
Secondary pedicel fixation or orientation
appressed +
Secondary pedicel height or length or size
short +
Secondary pedicel orientation
Ascending (Appressed) +
Secondary pedicel some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Secondary position
higher +
Sheath architecture
thick-walled +
Sheath character
anatomy +
Sheath condition
closed +
Sheath position relational
surrounded +
Sheath pubescence
villous +
Sheath quantity
1 (?) +
Sheath shape
not keeled +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V25/V25 1268.xml +
Spike architecture
complex +
Spike arrangement
bisexual +
Spike reproduction
unisexual +
Spikelet architecture
sessile +
Spikelet arrangement
in triplets +  and paired +
Spikelet character
length +
Spikelet fixation
attached +
Spikelet presence
absent +
Spikelet pubescence
villous +
Spikelet quantity
1 +  and 60 +
Spikelet reproduction
unisexual +  and bisexual +
Spikelet shape
ovoid +
Spikelet some measurement
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Spikelet variability
equaling +
Stamen quantity
1 +  and 3 +
Starch-grain architecture
compound +  and simple +
Stigma coloration
red +
Style-branch arrangement
close +
Style-branch atypical quantity
4 +  and 1 +
Style-branch fusion
fused +  and free +
Style-branch quantity
2 (?) +
Style quantity
2 +  and 3 +
Subsidiary-cell shape
dome--shaped +  and triangular +
Synonyms
Gramineae +
Taxon family
Poaceae +
Taxon name
Panicum urvilleanum +
Taxon parent
Panicum sect. Urvilleana +
Taxon rank
species +
Tissue coloration
hyaline +
Tissue texture
membranous +
Tuft size
small +
Upper floret architecture
stipitate +  and sessile +
Upper floret architecture or pubescence or relief
smooth +
Upper floret coloration or pubescence or relief
striate +
Upper floret reflectance
shining +
Upper floret reproduction
bisexual +
Upper glume architecture
7-15-veined +
Upper glume height or length or size
shorter +
Upper glume length or size
much longer +
Upper glume presence
absent +
Upper glume size
subequal +
Upper glume size or length
shorter to much +
Upper lemma architecture or pubescence or relief
smooth +
Upper lemma pubescence
villous +
Upper lemma reflectance
shiny +
Upper lemma relief
rugose +  and verrucose +
Upper lemma texture
chartaceous-indurate +  and rigid +
Upper lower lemma architecture
7-15-veined +
Upper palea coloration or pubescence or relief
striate +
Upper palea relief
rugose +
Vascular-bundle arrangement
separated +
Vein presence
absent +
Vein quantity
2 (?) +
Vein size
major +
Volume
Volume 25 +
Whole organism architecture
rhizomatous +
Whole organism arrangement or pubescence
tufted +
Whole organism duration
perennial +
Whole organism growth form
plant +
Whole organism growth form or habitat
aquatic +  and terrestrial +
Whole organism growth form or texture
herbaceous +
Whole organism quantity
3 (?) +
Whole organism reproduction
dioecious +, monoecious +  and synoecious +
Whole organism variability
variable +
X chromosome atypical quantity
14 +, 12 +  and 7 +
X chromosome quantity
9 +