Piptatherum shoshoneanum

(Curto & Douglass M. Hend.) P.M. Peterson & Soreng
Common names: Shoshone piptatherum
Treatment appears in FNA Volume 24.

Plants tightly cespitose, not rhizomatous. Culms 20-50 cm, internodes smooth to scabridulous; nodes glabrate; basal branching intravaginal. Leaves basally concentrated; ligules 1.8-5.5 mm, hyaline, acute, often lacerate; blades 4-16 cm long, 1-2.5 mm wide when flat, 0.6-1 mm in diameter when involute, abaxial surfaces smooth or scabridulous, adaxial surfaces scabridulous. Panicles 3.3-22 cm, lower nodes with 1-2 (4) branches; branches 1.8-11.6 cm, flexuous, initially appressed, becoming strongly divergent to reflexed, secondary and tertiary branches appressed to the primary branches. Glumes subequal, 3.2-5.3 mm, exceeding the florets by 0.2-1.5 mm, ovate to broadly lanceolate, 1-9-veined, apices acute to acuminate; florets 2.4-4.1 mm, dorsally compressed; calluses about 0.3 mm, hairy, disarticulation scars round; lemmas coriaceous, evenly pubescent, hairs to 0.5 mm, becoming tawny with age, margins not overlapping at maturity; awns 1-2.5 mm, straight or slightly arcuate, caducous; paleas 2.1-3.6 mm, similar to the lemmas in texture and pubescence; anthers 1.7-2.2 mm, penicillate; ovaries truncate, bearing 2 styles. Caryopses 1.8-2 mm long, about 0.8 mm thick; hila linear, about 9/10 the length of the caryopses. 2n = 20.

Discussion

Piptatherum shoshoneanum is known best from eastern Idaho, where it grows in the canyons of the Middle Fork of the Salmon River and its tributaries. It has also been found 750 km to the southwest in the Belted Range of southwestern Nevada. So far, fieldwork on the intervening mountain ranges has not revealed additional populations. It usually grows in moist crevices of igneous, metamorphic, or sedimentary cliffs and rock walls.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."prolonged" is not a number.

... more about "Piptatherum shoshoneanum"
scabridulous +  and smooth +
membranous +  and scarious +
penicillate +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
awned +, bifid +, bilobed +  and entire +
not stiff +
hairy +  and glabrous +
Acute (?) +  and Acuminate (?) +
Mary E. Barkworth +
(Curto & Douglass M. Hend.) P.M. Peterson & Soreng +
twisted +  and not branched +
1 (?) +  and 3 (?) +
20 cm200 mm <br />0.2 m <br /> (?) +
arcuate +  and straight +
subterminal +  and eccentric +
2 times-geniculate scabrous +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
keeled +  and rounded +
not branching +
extravaginal +
swelling +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
4 cm40 mm <br />0.04 m <br /> (16 cm160 mm <br />0.16 m <br />) +
not evident +
tapering +
1mm;2.5mm +
spikelike +
well-developed +
0.3 cm3 mm <br />0.003 m <br /> (?) +
Shoshone piptatherum +
solid +  and hollow +
perennial +  and annual +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
not woody +
Md. +, N.J. +, Utah +, Calif. +, Pa. +, Ariz. +, Idaho +  and Nev. +
0 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
compressed +
2.4mm +  and 4.1mm +
1-10-veined +
subtending +
ovate +  and broadly lanceolate +
subequal +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.53 cm5.3 mm <br />0.0053 m <br />) +
membranous +
not spreading +
uncinate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
3 cm30 mm <br />0.03 m <br /> (40 cm400 mm <br />0.4 m <br />) +
solid +  and hollow +
smooth +  and scabridulous +
basally concentrated +  and evenly distributed +
light-brown +  and black +
ovate +, rectangular +  and lanceolate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
coriaceous +
lacerate +  and acute +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
not overlapping +
concealed +  and prominent +
1 +  and 6 +
2 +  and 1 +
pubescent +  and glabrous +
well-developed +
2(3)-veined +
not keeled +
reduced +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
3.3 cm33 mm <br />0.033 m <br /> (22 cm220 mm <br />0.22 m <br />) +
dry +  and fleshy +
not prolonged +
smooth to scabrous +
1 +  and 60 +
unisexual +  and bisexual +
laterally compressed +  and terete +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Piptatherum shoshoneanum +
Piptatherum +
species +
membranous +
plant +  and cespitose +
aquatic +  and terrestrial +