Aristida palustris

(Chapm.) Vasey
Common names: Longleaf threeawn
Endemic
Treatment appears in FNA Volume 25. Treatment on page 338.

Plants perennial; cespitose, bases hard, knotty. Culms 90-150 cm, often thickened basally, stiffly erect, usually unbranched; internodes hollow. Leaves cauline; sheaths usually shorter than the internodes, glabrous, remaining intact at maturity; collars glabrous; ligules to 0.1 mm; blades (8) 10-30 (35) cm long, 2-4 mm wide, usually flat, occasionally loosely involute, lax, glabrous, light yellow-green to bluish-green when young, drying brownish. Inflorescences paniculate, 25-45 (55) cm long, 3-6 cm wide; nodes glabrous; primary branches 2-8 cm, usually single or paired, appressed to erect, occasionally ascending, without axillary pulvini, with (1) 2-12 spikelets. Spikelets overlapping, appressed. Glumes (7.5) 9-13.5 mm, subequal, stiff, glabrous or scabridulous, light-brown or greenish-brown; lower glumes prominently 2-veined, 2-keeled by the development of 1 lateral-vein, shortly (1-2 mm) awn-tipped; upper glumes 1-veined, shortly (0.5-1 mm) awn-tipped; calluses 1-1.4 mm; lemmas 6-9 mm, glabrous, 0.3-0.5 mm wide distally, light tan to brown, junction with the awns not evident; awns not disarticulating at maturity; central awns 15-40 mm, usually strongly curved basally, strongly divergent to horizontal distally; lateral awns 8-35 mm, at least 1/2 as long as the central awns, erect to strongly divergent; anthers 3, about 3 mm, purplish. Caryopses 4.4-5 mm, chestnut-brown. 2n = unknown.

Distribution

Tex., La., Ala., Ga., Miss., Ky., Fla., N.C., S.C., Va.

Discussion

Aristida palustris is endemic to the southeastern United States, where it grows in seepage bogs, pitcher plant savannahs, wet pine flatwoods, bald-cypress depressions, and wet prairies. It is a distinctive species of the southeastern coastal plain region that differs from A. lanosa in several reproductive, vegetative, and habitat characteristics.

Selected References

None.

Lower Taxa

None.

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

... more about "Aristida palustris"
3 cm30 mm <br />0.03 m <br /> (?) +
Kelly W. Allred +
(Chapm.) Vasey +
not disarticulating +
1 (?) +  and 3 (?) +
straight +
ascending +  and spreading +
not evident +
keeled +  and rounded +
coiled +, disarticulating +  and twisted +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
straight +
brownish +, light yellow-green +  and bluish-green +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
usually linear +  and lanceolate occasionally ovate +
2mm;4mm +
spikelike +
well-developed +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
chestnut-brown +
0.44 cm4.4 mm <br />0.0044 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
non-radiate +  and radiate +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Longleaf threeawn +
90 cm900 mm <br />0.9 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
not woody +
Tex. +, La. +, Ala. +, Ga. +, Miss. +, Ky. +, Fla. +, N.C. +, S.C. +  and Va. +
large +  and small +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
greenish-brown +  and light-brown +
subtending +
scabridulous +
acute +  and acuminate +
subequal +
0.9 cm9 mm <br />0.009 m <br /> (1.35 cm13.5 mm <br />0.0135 m <br />) +
25cm +  and 45cm +
0.8 cm8 mm <br />0.008 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
light tan +  and brown +
scabridulous +
fusiform +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
coriaceous +
0.3mm +  and 0.5mm +
indistinguishable +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
concealing +
0 +  and 1/2 +
dry +  and fleshy +
ascending;appressed;erect +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
not prolonged +
1 (?) +  and Anatomy (?) +
2 +  and 12 +
1 (?) +  and 3 (?) +
triangular +  and dome--shaped +
2 (?) +  and 3 (?) +
Gramineae +
Aristida palustris +
Aristida +
species +
membranous +
awn-tipped +  and 1-veined +
plant +  and cespitose +
aquatic +  and terrestrial +