Danthonia californica

Bol.
Common names: California oatgrass
Synonyms: Danthonia macounii Danthonia californica var. americana
Treatment appears in FNA Volume 25. Treatment on page 305.

Culms (10) 30-130 cm, disarticulating at the nodes at maturity. Sheaths glabrous or pilose, upper sheaths usually glabrous or unevenly pilose; blades 10-30 cm long, (1) 2-5 (6) mm wide, flat to rolled or involute, glabrous or pilose, uppermost cauline blades strongly divergent to reflexed at maturity. Inflorescences usually racemose, with (2) 3-6 (10) widely-spreading spikelets; branches flexible, strongly divergent to reflexed at maturity, pulvini usually present at the base; pedicels on the lowest branch longer than the spikelets, often crinkled. Spikelets (10) 14-26 (30) mm. Calluses of middle florets usually longer than wide, concave abaxially; lemma bodies 5-10 mm, glabrous or sparsely pilose over the back, margins pubescent (rarely glabrous), apical teeth (2) 4-6 (7) mm, aristate; awns (7) 8-12 mm; anthers to 4 mm. Caryopses 2.5-4.2 mm long, 1.3-1.6 mm wide. 2n = 36.

Distribution

Mass., N.Mex., Wash., Utah, Calif., Oreg., Alta., B.C., Sask., Mont., Wyo., Colo., Ariz., Idaho, Nev., S.Dak.

Discussion

Danthonia californica grows in prairies, meadows, and open woods. It has a disjunct distribution, one por¬tion of its range being located in western North America, the other in Chile. An introduced population has been found at Mansfield, Massachusetts.

Plants with pilose foliage have been called Danthonia californica var. americana (Scribn.) Hitchc. and plants with sparsely pilose lemma backs D. californica var. macounii Hitchc, but the variation does not appear to be taxonomically significant.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Danthonia californica"
0 cm0 mm <br />0 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
obtuse +, awned +  and mucronate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Stephen J. Darbyshire +
1 (?) +  and 3 (?) +
7 cm70 mm <br />0.07 m <br /> (?) +
geniculate +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
pilose +  and glabrous +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not pseudopetiolate +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
pilose +  and glabrous +
flat +  and rolled or involute +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
hirsute +  and scabrous +
spikelike +
usually longer than wide +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.42 cm4.2 mm <br />0.0042 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 />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
not disarticulating +
California oatgrass +
disarticulating +
perennial +  and annual +
30 cm300 mm <br />0.3 m <br /> (130 cm1,300 mm <br />1.3 m <br />) +
woody +  and herbaceous +
Mass. +, N.Mex. +, Wash. +, Utah +, Calif. +, Oreg. +, Alta. +, B.C. +, Sask. +, Mont. +, Wyo. +, Colo. +, Ariz. +, Idaho +, Nev. +  and S.Dak. +
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 +
solid +  and hollow +
scabrous +  and glabrous +
pilose +  and glabrous +
0.5 cm5 mm <br />0.005 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 +
pilose +  and glabrous +
sterile +, bisexual +  and unisexual +
compressed +  and terete +
1.4 cm14 mm <br />0.014 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
1 +  and 3 +
2 (?) +  and 3 (?) +
Danthonia macounii +  and Danthonia californica var. americana +
Danthonia californica +
Danthonia +
species +
membranous +
pilose +  and glabrous +
plant +  and cespitose +
aquatic +  and terrestrial +