Agrostis rossiae

Vasey
Common names: Ross' bent
Endemic
Synonyms: Agrostis rossae
Treatment appears in FNA Volume 24. Treatment on page 656.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants annual. Culms 4-20 cm. Sheaths smooth, upper sheaths inflated; ligules (0.6) 1-1.5 mm, dorsal surfaces scabrous, apices truncate to rounded, lacerate to erose-ciliolate; blades 1-2.5 cm long, 1-2 mm wide, flat or folded. Panicles 1.5-6 cm long, 0.4-2 cm wide, initially lanceo¬late, becoming ovate and diffuse, bases sometimes enclosed in the upper sheaths; branches 1-3 cm, erect to spreading, scabrous; pedicels 0.5-6.3 mm. Spikelets ovate, green, slightly to strongly tinged with purple. Glumes equal, 2-2.5 mm, 1-veined, acuminate; lower glumes scabrous on the midvein; upper glumes smooth or scabrous on the midvein; callus hairs to 0.1 mm, sparse; lemmas 1.3-1.7 mm, scabrous, translucent to opaque, 5-veined, veins mostly obscure, apices truncate, entire, erose, or the veins excurrent to about 0.12 mm, unawned; paleas to 0.2 mm, thin; anthers 3, 0.5-0.9 mm, often retained at the apices of the caryopses. Caryopses 1.2-1.5 mm; endosperm semisoft. 2n = unknown.

Discussion

Agrostis rossiae is a rare species, originally known only from alkaline soils near hot springs in Yellowstone National Park, Wyoming. Tercek et al. (2003) showed that somewhat morphologically similar plants of A. scabra found around hot springs in Yellowstone and Lassen Volcanic national parks, and of A. pauzhetica Prob. found around hot springs on the Kamchatka Peninsula, Russia, are closely related to A. rossiae. They recommended, however, that the three be treated as separate species until more information has been obtained.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Agrostis rossiae"
membranous +  and scarious +
not penicillate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
entire +  and truncate +
erose-ciliolate +
lacerate +, truncate +  and rounded +
M.J. Harvey +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
geniculate +
rounded +  and keeled +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
not evident +
scabridulous +
folded +  and flat +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
erect;spreading +
spikelike +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
hairy +  and glabrous +
Ross' bent +
not branching +
4 cm40 mm <br />0.04 m <br /> (20 cm200 mm <br />0.2 m <br />) +
not woody +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
sterile +  and bisexual +
compressed +
reduced +
(1)1.3-2(4) times longer than +
subtending +
acuminate +
unequal +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
uncinate +
diffuse +  and dense +
translucent +  and opaque +
pubescent +  and glabrous +
warty-tuberculate +  and scabridulous +
lanceolate +  and ovate +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
membranous +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
membranous +
inconspicuous +
lanceolate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
minute +  and subequal +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
1.5cm +  and 6cm +
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.63 cm6.3 mm <br />0.0063 m <br />) +
dry +  and fleshy +
not prolonged +
hairy +  and glabrous +
scabrous +  and scabridulous +
tinged with purple +  and green +
1 +  and 60 +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Agrostis rossae +
Agrostis rossiae +
Agrostis +
species +
membranous +
2 (?) +  and 5 (?) +
not convergent +
scabrous +  and scabridulous +
stoloniferous +  and rhizomatous +
aquatic +  and terrestrial +