Aristida purpurea var. fendleriana

(Steud.) Vasey
Common names: Fendler's threeawn
Synonyms: Aristida fendleriana
Treatment appears in FNA Volume 25. Treatment on page 332.

Culms 10-40 cm. Leaves mostly cauline; blades 4-10 cm, involute. Panicles 3-14 (15) cm; primary branches mostly appressed, stiff, straight, without axillary pulvini, with few spikelets. Lower glumes 5-8 mm; upper glumes 10-15 mm; lemmas 8-14 mm long, apices 0.2-0.3 wide; awns subequal, 18-40 mm long, occasionally slightly longer, 0.2-0.3 mm wide at the base. 2n = 22, 44.

Distribution

N.Mex., Tex., Utah, Colo., Mont., Nebr., Wyo., Calif., Kans., N.Dak., Nev., Okla., Ariz., S.Dak.

Discussion

Aristida purpurea var. fendleriana grows on open slopes, hills, and sandy flats, at low to medium elevations, from the western United States into northern Mexico. It is often confused with var. longiseta, having short basal leaves and short panicles, but plants of var. fendleriana have narrower lemma apices and thinner, shorter awns than those of var. longiseta.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.2;0.3 +
Kelly W. Allred +
(Steud.) Vasey +
not disarticulating +
divaricate +
1 (?) +  and 3 (?) +
8 cm80 mm <br />0.08 m <br /> (?) +
straight +
1.8 cm18 mm <br />0.018 m <br /> (4 cm40 mm <br />0.04 m <br />) +
not conspicuous +
subequal +
1.3 cm13 mm <br />0.013 m <br /> (14 cm140 mm <br />0.14 m <br />) +
0.2mm;0.3mm +
keeled +  and rounded +
coiled +, disarticulating +  and twisted +
spreading +  and appressed +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
straight +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
4 cm40 mm <br />0.04 m <br /> (25 cm250 mm <br />0.25 m <br />) +
scabridulous +
curled +, tightly involute +  and flat +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
spikelike +
well-developed +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
tan +  and chestnut +
0.6 cm6 mm <br />0.006 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
non-radiate +  and radiate +
pilose +  and glabrous +
Fendler's threeawn +
erect +  and ascending +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not woody +
N.Mex. +, Tex. +, Utah +, Colo. +, Mont. +, Nebr. +, Wyo. +, Calif. +, Kans. +, N.Dak. +, Nev. +, Okla. +, Ariz. +  and S.Dak. +
large +  and small +
thread-like +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
subtending +
acute +  and acuminate +
unequal +
straight +
3 cm30 mm <br />0.03 m <br /> (?) +  and 30 cm300 mm <br />0.3 m <br /> (?) +
2 cm20 mm <br />0.02 m <br /> (12 cm120 mm <br />0.12 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (14 cm140 mm <br />0.14 m <br />) +
whitish +  and purplish +
0.8 cm8 mm <br />0.008 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
tuberculate +  and scabridulous +
fusiform +
0.6 cm6 mm <br />0.006 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
coriaceous +
indistinguishable +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
inconspicuous +
scabridulous +  and smooth +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
concealed +  and prominent +
with straight +  and glabrous +
2 +  and 1 +
concealing +
0 +  and 1/2 +
15 cm150 mm <br />0.15 m <br /> (?) +
3 cm30 mm <br />0.03 m <br /> (14 cm140 mm <br />0.14 m <br />) +
dry +  and fleshy +
ascending;usually appressed;ascending +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
not prolonged +
not disintegrating +
shorter or longer +
1 (?) +  and Anatomy (?) +
1 +  and 3 +
triangular +  and dome--shaped +
2 (?) +  and 3 (?) +
Aristida fendleriana +
Aristida purpurea var. fendleriana +
Aristida purpurea +
variety +
membranous +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
plant +  and cespitose +
aquatic +  and terrestrial +