Aristida patula

Chapm. ex Nash
Common names: Tall threeawn
Endemic
Treatment appears in FNA Volume 25. Treatment on page 321.

Plants perennial; loosely cespitose, bases knotty, sometimes shortly rhizomatous. Culms (60) 70-100 cm, stiffly erect, unbranched. Leaves cauline; sheaths longer than the internodes, mostly glabrous, summit with hairs; collars hispid, hairs 0.2-0.8 mm; ligules less than 0.5 mm; blades 20-55 cm long, 2-4 mm wide, light bluish-green, flat to loosely folded, glabrous abaxially, scabridulous adaxially. Inflorescences paniculate, 30-50 cm long, 15-25 cm wide; rachis nodes glabrous or with straight hairs shorter than 0.5 mm; primary branches 8-22 cm, ascending to divaricate or drooping, with axillary pulvini, basal portion without spikelets. Spikelets appressed along the branches. Glumes brown to purplish, 1-veined, with a 1-2 mm awn; lower glumes 10-13 mm, slightly longer than the upper glumes; calluses 0.5-1 mm; lemmas 10-12 (15) mm, glabrous, light gray to brownish, narrowing to a beak, beak less than 7 mm, not or only slightly twisted, junction with the awns not conspicuous; awns unequal, not disarticulating at maturity; central awns 20-25 mm, straight; lateral awns 3-10 mm, to 1/2 as long as and about 1/2 as thick as the central awns, usually divergent; anthers 3, about 3 mm, yellow-green. Caryopses about 8 mm. 2n = unknown.

Discussion

Aristida patula grows in sandy fields, low pinelands, and roadsides. It is endemic to Florida.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Aristida patula"
yellow-green +
3 cm30 mm <br />0.03 m <br /> (?) +
Kelly W. Allred +
Chapm. ex Nash +
not disarticulating +
1 (?) +  and 3 (?) +
straight +
ascending +  and spreading +
not conspicuous +
unequal +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
keeled +  and rounded +
rhizomatous +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
straight +
0 cm0 mm <br />0 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
light bluish-green +
20 cm200 mm <br />0.2 m <br /> (55 cm550 mm <br />0.55 m <br />) +
scabridulous +
flat +  and loosely folded +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
spikelike +
well-developed +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
8 cm80 mm <br />0.08 m <br /> (?) +
non-radiate +  and radiate +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Tall threeawn +
70 cm700 mm <br />0.7 m <br /> (100 cm1,000 mm <br />1 m <br />) +
not woody +
large +  and small +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
brown +  and purplish +
subtending +
acute +  and acuminate +
straight +
0.5 cm5 mm <br />0.005 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
30 cm300 mm <br />0.3 m <br /> (?) +  and 50 cm500 mm <br />0.5 m <br /> (?) +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
light gray +  and brownish +
scabridulous +
fusiform +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
coriaceous +
narrowing +
indistinguishable +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
inconspicuous +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
concealed +  and prominent +
2 +  and 1 +
concealing +
0 +  and 1/2 +
dry +  and fleshy +
drooping;ascending +
8 cm80 mm <br />0.08 m <br /> (22 cm220 mm <br />0.22 m <br />) +
not prolonged +
with straight hairs +  and glabrous +
1 (?) +  and Anatomy (?) +
1 +  and 60 +
1 +  and 3 +
triangular +  and dome--shaped +
2 (?) +  and 3 (?) +
Gramineae +
Aristida patula +
Aristida +
species +
membranous +
plant +  and cespitose +
aquatic +  and terrestrial +