familyPoaceae
subfamilyPoaceae subfam. Pooideae
tribePoaceae tribe Poeae
genusHelictotrichon
speciesHelictotrichon mortonianum
Helictotrichon mortonianum
Common names: Alpine oatgrass
Endemic
Synonyms: Avena mortoniana
Treatment appears in FNA Volume 24. Treatment on page 701.
Culms 5-20 cm. Ligules 0.5-1 mm, truncate to rounded, ciliate; blades 3-6 cm long, 1-2 mm wide, involute or convolute, strigose, particularly on the adaxial surfaces. Panicles 2-5 (8) cm; branches erect, usually with 1 spikelet each. Spikelets 8-12 mm, with (1) 2 (3) florets. Glumes equal or nearly so, 8-11 mm, acuminate or awn-tipped, awns 0.3-0.5 mm; lowest lemmas 7-10 mm, 3-veined, apices 4-toothed, awns 10-16 mm; distal lemmas unawned or awned; anthers 1.5-2 mm. 2n = 14, 28.
Distribution
Utah, Colo., N.Mex., Wyo.
Discussion
Helictotrichon mortonianum grows in alpine and subalpine meadows and summits, at 3000-4200 m. It is restricted to the central and southern Rocky Mountains of the contiguous United States.
Selected References
None.
Lower Taxa
None.
"decumbent" is not a number.
... more about "Helictotrichon mortonianum"
absent +
common +
absent +
bulliform +
absent +
4-toothed +
absent +
absent +
twisted +
straight +
arising +
single +
close +
free +
hard +
thick +
parallel +
not evident +
strigose +
erect +
spikelike +
1 cm10 mm <br />0.01 m <br /> (?) +
developed +
strigose +
acute +
Alpine oatgrass +
not branching +
annual +
climbing +
floating +
erect +
not woody +
reduced +
solid +
capillary +
adjacent +
sometimes longer +
distal +
compressed +
reduced +
awn-tipped +
shorter +
shorter or longer +
subtending +
absent +
acuminate +
unequal +
uncinate +
punctate +
Present +
compound +
hollow +
absent +
absent +
distichous +
3-5-veined +
shorter +
longer +
ciliate-erose +
absent +
membranous +
veined +
truncate +
inconspicuous +
lobed +
membranous +
3-veined +
simple +
absent +
pubescent +
well-developed +
shorter +
absent +
2-keeled +
minute +
8 cm80 mm <br />0.08 m <br /> (?) +
spikelike +
reduced +
narrow +
absent +
separating +
thin +
not developed +
absent +
prolonged +
pilose +
evident +
open +
closed +
open +
Endemic +
ebracteate +
mixed +
attached +
viviparous +
compressed +
parallel-sided +
Helictotrichon mortonianum +
Helictotrichon +
species +
hyaline +
membranous +
absent +
perennial +