Deschampsia danthonioides

(Trin.) Munro
Common names: Annual hairgrass
Treatment appears in FNA Volume 24. Treatment on page 631.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants annual; tufted. Culms 10-40 (70) cm, erect. Leaves not forming a basal tuft; ligules (0.5) 2-3 (4.7) mm, acute to acuminate, entire; blades 0.3-1.5 mm wide, involute or flat. Panicles 5-15 (25) cm long, 2-8 cm wide, contracted to open, erect; branches with the spikelets confined to the distal portion. Spikelets 4-9 mm, bisexual, narrowly V-shaped, usually pale green. Glumes exceeding the distal florets, glabrous to scabridulous, 3-veined; lower glumes 4-9 mm; upper glumes 3.5-8.5 mm; callus hairs 0.4-1.6 mm; lemmas 1.5-3 mm, smooth, shiny, glabrous, pale green or purplish, apices blunt, erose to 4-toothed, ciliate, awns 4-9 mm, attached from near the base to about the middle of the lemmas, strongly geniculate, geniculation above the lemma apices, distal segment 1.5-5 mm; anthers 0.3-0.5 mm. 2n = 26.

Distribution

Maine, Oreg., N.Mex., Wash., N.Y., Utah, Alaska, Ohio, Idaho, Mont., B.C., Yukon, Wyo., Ariz., Calif., Nev.

Discussion

Deschampsia danthonioides grows in temperate and cool-temperate regions, usually in open, wet to dry habitats and often in disturbed ground. Its primary range extends from southern British Columbia, through Washington and Idaho, to Baja California, Mexico. It also grows, as a disjunct, in Chile and Argentina.

Records from the Yukon Territory date from the late 1800s and early 1900s; it has not been seen since in the region. Records from east of the primary region are also probably introductions; it is not known whether the species has persisted at these locations.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Deschampsia danthonioides"
membranous +  and scarious +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
4-toothed +  and blunt +
Mary E. Barkworth +
(Trin.) Munro +
1 (?) +  and 3 (?) +
straight +
attached +
subapical +
geniculate +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
flat +  and involute +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
spikelike +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
Annual hairgrass +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not woody +
Maine +, Oreg. +, N.Mex. +, Wash. +, N.Y. +, Utah +, Alaska +, Ohio +, Idaho +, Mont. +, B.C. +, Yukon +, Wyo. +, Ariz. +, Calif. +  and Nev. +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
viviparous +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
scabridulous +
acute +  and acuminate +
subequal +  and unequal +
uncinate +
(3)5-7-veined +
purplish +  and pale green +
rounded +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
acute +  and acuminate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
membranous +
inconspicuous +
lanceolate +  and ovatelanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
5cm +  and 15cm +
spikelike +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
dry +  and fleshy +
1 +  and 60 +
v--shaped +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Deschampsia danthonioides +
Deschampsia +
species +
membranous +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
parallel +  and converging +
stoloniferous +  and rhizomatous +
aquatic +  and terrestrial +