Dichanthelium acuminatum subsp. thermale

(Bol.) Freckmann & Lelong
Common names: Geyser panicgrass
Synonyms: Panicum thermale
Treatment appears in FNA Volume 25. Treatment on page 426.

Plants often densely cespitose, densely and softly pubescent throughout, with soft, thin, spreading, papillose-based hairs on the culms and lower sheaths. Culms usually over 30 cm. Midculm sheaths about 1/2 as long as the internodes; blades at midculm generally 6.5-12 cm long, usually more than 7 times as long as wide, suberect, softly pubescent on the abaxial surface, without papillose-based cilia on the distal 1/2. Primary panicles usually poorly exserted, peduncles shorter than 6 cm. Spikelets mostly 1.8-2 mm.

Discussion

Dichanthelium acuminatum subsp. thermale grows on the mineralized crust of warm, moist soil at the Geysers, Sonoma County, California; it is listed as endangered in that state.

Selected References

None.

Lower Taxa

None.

"usually distinctly longer and narrower" is not a number."decumbent" is not a number."thin" is not a number.

decumbent +, spreading +  and erect +
rounded +  and attenuate +
anatomy +  and kranz +
Mary E. Barkworth +
(Bol.) Freckmann & Lelong +
1 (?) +  and 3 (?) +
keeled +  and rounded +
well-differentiated +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
subcordate +  and rounded +
swelling +
disarticulating +  and pseudopetiolate +
grayish-green +  and olivaceous +
distinct +
2 cm20 mm <br />0.02 m <br /> (12 cm120 mm <br />0.12 m <br />) +
ovate +  and lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
spikelike +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not developed +
terete +  and compressed +
papillose-based +
sometimes longer +
Geyser panicgrass +
decumbent +  and sprawling +
decumbent +, ascending +  and erect +
1 cm10 mm <br />0.01 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Conn. +, N.J. +, N.Y. +, Wash. +, Va. +, Del. +, D.C. +, Wis. +, W.Va. +, Alta. +, B.C. +, Man. +, N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Mass. +, Maine +, N.H. +, R.I. +, Vt. +, Fla. +, Wyo. +, N.Mex. +, Tex. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Calif. +, Puerto Rico +, Colo. +, Miss. +, Ala. +, Ark. +, Kans. +, Mo. +, N.Dak. +, Nebr. +, Okla. +, S.Dak. +, Mich. +, Minn. +, Ill. +, Ga. +, Ind. +, Iowa +, Ariz. +, Idaho +, Md. +, Ohio +, Utah +, Oreg. +, Mont. +, Pacific Islands (Hawaii) +, Nev. +  and Ky. +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
unequal +
membranous +
papillose-based +
uncinate +
3 cm30 mm <br />0.03 m <br /> (?) +
Oval (?) +  and Round (?) +
bracteate +  and ebracteate +
olive green or grayish-green +  and yellowish-green +
glabrous +  and pubescent +
cauline +  and basal +
coriaceous +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
membranous +
inconspicuous +
1/4 +  and 1/2 +
obtuse +  and acute +
glabrous +  and ciliate +
whitish-scabridulous +
6.5 cm65 mm <br />0.065 m <br /> (12 cm120 mm <br />0.12 m <br />) +
complex +  and simple +
concealed +  and prominent +
pubescent +  and glabrous +
swollen +
2 +  and 1 +
subterranean +
6 cm60 mm <br />0.06 m <br /> (?) +
dry +  and fleshy +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
pilose +, puberulent +  and glabrous +
pubescent +, densely +  and glabrous +
in triplets +  and paired +
yellowish-green +  and olivaceous or purplish +
1 +  and 60 +
unisexual +  and bisexual +
subacute +, obtuse +, obovoid +  and ellipsoid +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1 +  and 3 +
fused +  and free +
2 +  and 3 +
dome--shaped +  and triangular +
Panicum thermale +
Dichanthelium acuminatum subsp. thermale +
Dichanthelium acuminatum +
subspecies +
membranous +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
obtuse +  and acute or minutely umbonate or apiculate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
chartaceous-indurate +
decumbent +, spreading +  and erect +
involute +  and flat +
decumbent +, spreading +  and erect +
decumbent +, spreading +  and erect +
decumbent +, spreading +  and erect +
decumbent +, spreading +  and erect +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +