Aristida mohrii

Nash
Common names: Mohr's threeawn
Treatment appears in FNA Volume 25. Treatment on page 337.

Plants perennial; cespitose, bases knotty. Culms 55-110 cm, erect, unbranched. Leaves cauline; sheaths shorter or longer than the internodes, glabrous, not disintegrating at maturity; collars glabrous, or sparsely pilose at the sides; ligules about 0.2 mm; blades 5-25 cm long, 1-2 mm wide, flat or loosely folded, pale green, cauline leaves usually glabrous adaxially, innovation leaves pilose. Inflorescences spikelike racemes, 20-45 cm long, 1-2 cm wide; nodes glabrous, with only 1 spikelet. Spikelets solitary, not overlapping. Glumes 9-11 mm, equal or the lower glumes slightly longer than the upper, narrowly oblong, often slightly falcate, tan to brown, 1-veined; lower glumes occasionally with 1-2 faint lateral-veins, awn-tipped, awns about 0.5 mm; upper glume awned, awns 1-2.5 mm; calluses 1-1.5 mm; lemmas 7-10 mm, brown, lead-colored, or purplish, not beaked, junction with the awns not evident; awns equally thick, not disarticulating at maturity; central awns 14-20 mm, slightly longer than the lateral awns, strongly curved basally, distal portion reflexed; lateral awns horizontal to reflexed; anthers 3, about 4.5 mm, purplish. Caryopses 4-5 mm, chestnut-colored. 2n = unknown.

Discussion

Aristida mohrii is endemic to the southeastern United States, growing on dry, sandy pinelands and oak barrens, and occasionally in waste places. It is some¬times confused with A. simpliciflora because both have reduced, spikelike inflorescences, but A. simpliciflora has lateral awns that are only about half as thick as the central awn, and its spikelets are borne in pairs.

Selected References

None.

Lower Taxa

None.

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

... more about "Aristida mohrii"
4.5 cm45 mm <br />0.045 m <br /> (?) +
Kelly W. Allred +
not disarticulating +
1 (?) +  and 3 (?) +
straight +
ascending +  and spreading +
not evident +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
keeled +  and rounded +
coiled +, disarticulating +  and twisted +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
straight +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
folded +  and flat +
1mm;2mm +
spikelike +
well-developed +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
chestnut-colored +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
non-radiate +  and radiate +
1.4 cm14 mm <br />0.014 m <br /> (2 cm20 mm <br />0.02 m <br />) +
pilose +  and glabrous +
Mohr's threeawn +
55 cm550 mm <br />0.55 m <br /> (110 cm1,100 mm <br />1.1 m <br />) +
not woody +
S.C. +, Fla. +, Ala. +  and Ga. +
large +  and small +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
subtending +
acute +  and acuminate +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
20cm +  and 45cm +
horizontal +  and reflexed +
purplish +, lead-colored +  and brown +
scabridulous +
fusiform +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
coriaceous +
indistinguishable +
0.2 cm2 mm <br />0.002 m <br /> (?) +
inconspicuous +
awn-tipped +  and 1-veined +
falcate +  and oblong +
concealed +  and prominent +
2 +  and 1 +
concealing +
0 +  and 1/2 +
dry +  and fleshy +
divaricate +  and divergent +
ascending;usually appressed;ascending +
spikelike +
not prolonged +
not disintegrating +
shorter or longer +
1 (?) +  and Anatomy (?) +
not overlapping +
1 (?) +  and 3 (?) +
triangular +  and dome--shaped +
2 (?) +  and 3 (?) +
Gramineae +
Aristida mohrii +
Aristida +
species +
membranous +
plant +  and cespitose +
aquatic +  and terrestrial +