Danthonia parryi

Scribn.
Common names: Parry's oatgrass
Endemic
Treatment appears in FNA Volume 25. Treatment on page 305.

Culms 30-80 (100) cm, not disarticulating at maturity. Sheaths glabrous or sparsely pubescent; blades 15-25 cm long, to 4 mm wide, glabrous or scabrous (rarely pilose), uppermost cauline blades erect or diverging less than 20° from the culm at maturity. Inflorescences usually paniculate, sometimes racemose, with (3) 4-11 spikelets; branches appressed to ascending, somewhat flexible; pedicels on the lowest branch from shorter than to as long as the spikelets. Spikelets 16-24 mm. Calluses of middle florets longer than wide, concave abaxially; lemma bodies 5.5-10 mm, backs usually pilose, especially near the base (rarely glabrous), margins pilose, teeth 2.5-8 mm, aristate; awns 12-15 mm; anthers to 6.5 mm. Caryopses rarely produced, 3.5-5.2 mm long, 0.9-1.8 mm wide. 2n = 36.

Distribution

Alta., Sask., Colo., N.Mex., Wyo., Mont.

Discussion

Danthonia parryi is endemic to western North America and is often a major component of grasslands on the eastern foothills of the Rocky Mountains. It grows in open grassland, open woods, and rocky slopes, at elevations up to 4000 m. It rarely produces caryopses in the terminal inflorescences. This and its somewhat intermediate morphology have led to speculation that it is derived from hybridization between D. californica and D. intermedia.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Danthonia parryi"
0 cm0 mm <br />0 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
obtuse +, awned +  and mucronate +
Stephen J. Darbyshire +
Scribn. +
1 (?) +  and 3 (?) +
geniculate +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not pseudopetiolate +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
scabrous +  and glabrous +
involute +, flat +  and rolled +
0 cm0 mm <br />0 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
appressed;ascending +
hirsute +  and scabrous +
spikelike +
longer than wide +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
flattened +, ovate +  and obovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
not disarticulating +
Parry's oatgrass +
not disarticulating +
perennial +  and annual +
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
woody +  and herbaceous +
Alta. +, Sask. +, Colo. +, N.Mex. +, Wyo. +  and Mont. +
small +  and large +
capillary +
sometimes longer +
1 +, 3 +  and 12 +
compressed +
cleistogamous +  and chasmogamous +
(1)3-7-veined +
subtending +
subequal +
non-uncinate +
1/3 +  and 3/4 +
spicate +  and ebracteate +
racemose +  and paniculate +
solid +  and hollow +
scabrous +  and glabrous +
0.55 cm5.5 mm <br />0.0055 m <br /> (1 cm10 mm <br />0.01 m <br />) +
scabrous +  and glabrous +
rounded +
coriaceous +
acute +  and aristate +
inconspicuous +
with a few hairs +  and glabrous +
extended +
concealed +  and prominent +
2 +  and 1 +
well-developed +
sometimes slightly longer +
hirsute +  and scabrous +
dry +  and fleshy +
0 cm0 mm <br />0 m <br /> (12 cm120 mm <br />0.12 m <br />) +
hirsute +  and scabrous +
pubescent +  and glabrous +
4 +  and 11 +
sterile +, bisexual +  and unisexual +
compressed +  and terete +
1.6 cm16 mm <br />0.016 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
1 +  and 3 +
2 (?) +  and 3 (?) +
Gramineae +
Danthonia parryi +
Danthonia +
species +
membranous +
aristate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
plant +  and cespitose +
aquatic +  and terrestrial +