Aristida ramosissima

Engelm. ex A. Gray
Common names: S-curve threeawn
Endemic
Synonyms: Aristida ramosissima var. chaseana
Treatment appears in FNA Volume 25. Treatment on page 326.

Plants annual. Culms 20-60 cm, wiry. Leaves cauline; sheaths usually shorter than the internodes, mostly glabrous, sparsely hairy near the summit; collars hispidulous, occasionally glabrous; ligules 0.2-0.5 mm; blades 3-22 cm long, to 2 mm wide, flat to involute, glabrous abaxially, sparsely pilose adaxially, without a prominent midrib but with a thickened vein near each margin, pale to gray-green, sometimes slightly glaucous. Inflorescences paniculate or racemose, 5-12 cm long, 2-4 cm wide; primary branches barely developed. Spikelets appressed to slightly divergent from the axillary pulvini. Glumes subequal, apices bifid, awned from the sinuses; lower glumes (9) 11-16 mm, 3-7-veined, awns 0.5-2 (4) mm; upper glumes 11-18 mm, 1-3-veined, awns 3-7 mm; calluses 0.4-1 mm; lemmas (8) 15-20 (22) mm, dark, occasionally banded or spotted, apices narrowed but not beaklike; central awns 12-25 mm, bases with a semicircular bend; lateral awns 1-4 mm, erect, occasionally lacking; anthers 3, about 3 mm, brown. Caryopses 9-11 mm, dark-brown to black. 2n = unknown.

Distribution

Tenn., Okla., Tex., La., Mo., Ohio, Kans., Ark., Ill., Miss., Ind., Iowa, Ky.

Discussion

Aristida ramosissima grows in open, dry, sterile ground, fallow fields, and roadsides. It is restricted to the United States.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."elongated" is not a number.

... more about "Aristida ramosissima"
3 cm30 mm <br />0.03 m <br /> (?) +
awned +  and bifid +
Kelly W. Allred +
Engelm. ex A. Gray +
1 (?) +  and 3 (?) +
4 cm40 mm <br />0.04 m <br /> (?) +
straight +
ascending +  and spreading +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
keeled +  and rounded +
coiled +, disarticulating +  and twisted +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
straight +
pale +  and gray-green +
3 cm30 mm <br />0.03 m <br /> (22 cm220 mm <br />0.22 m <br />) +
glaucous +, pilose +  and glabrous +
flat +  and involute +
0mm;2mm +
spikelike +
well-developed +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
dark-brown +  and black +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
non-radiate +  and radiate +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
glabrous +  and hispidulous +
S-curve threeawn +
20 cm200 mm <br />0.2 m <br /> (60 cm600 mm <br />0.6 m <br />) +
not woody +
Tenn. +, Okla. +, Tex. +, La. +, Mo. +, Ohio +, Kans. +, Ark. +, Ill. +, Miss. +, Ind. +, Iowa +  and Ky. +
large +  and small +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
subtending +
acute +  and acuminate +
subequal +
racemose +  and paniculate +
5cm +  and 12cm +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
spotted +, banded +  and dark +
scabridulous +
fusiform +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
coriaceous +
indistinguishable +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
inconspicuous +
1.1 cm11 mm <br />0.011 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
concealed +  and prominent +
2 +  and 1 +
concealing +
0 +  and 1/2 +
dry +  and fleshy +
divaricate +  and divergent +
ascending;usually appressed;ascending +
not prolonged +
hairy +  and glabrous +
1 (?) +  and Anatomy (?) +
1 +  and 60 +
1 (?) +  and 3 (?) +
triangular +  and dome--shaped +
2 (?) +  and 3 (?) +
Aristida ramosissima var. chaseana +
Aristida ramosissima +
Aristida +
species +
membranous +
1.1 cm11 mm <br />0.011 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
aquatic +  and terrestrial +