Aphanostephus skirrhobasis var. skirrhobasis

Endemic
Treatment appears in FNA Volume 20. Treatment on page 352.

Plants 10–30 (–50) cm. Stems erect to decumbent, puberulent, hairs spreading-deflexed, 0.1–0.3 mm. Leaves not strongly thickened or felty gray-hairy. Ray-florets (18–) 24–45. Pappi coroniform, usually uneven, ciliate, 0.1–0.3 mm, rarely of awn-tipped scales. 2n = 6.


Phenology: Flowering (Mar–)Apr–Jul(–Aug).
Habitat: Sand, sandy loam, sandy clay, silt, gravel, river terraces, oak woodlands, mesquite savannas, fields, roadsides
Elevation: 10–900 m

Distribution

V20-810-distribution-map.gif

Ark., Kans., La., N.Mex., Okla., Tex.

Discussion

Selected References

None.

Lower Taxa

None.

not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Guy L. Nesom +
(de Candolle) Trelease +
bulbous-swollen +
indurate +
Keerlia skirrhobasis +
broadly oblanceolate;linear-lanceolate +
rugulose +  and muricate +
barbellulate +  and barbellate +
not 2-lipped +  and actinomorphic +
yellow +  and white +
subterete +, 4-angled +  and angular-columnar +
fertile +  and bisexual +
fertile +  and bisexual +
Ark. +, Kans. +, La. +, N.Mex. +, Okla. +  and Tex. +
10–900 m +
glabrous +, strigose +, hirsute +  and hispid +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sand, sandy loam, sandy clay, silt, gravel, river terraces, oak woodlands, mesquite savannas, fields, roadsides +
spreading-deflexed +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
depressed-hemispheric +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
gray-hairy +  and felty +
deltate +
dentate to pinnatifid +  and entire +
pinnatifid +  and entire +
2-carpellate +
persistent +
coroniform +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Flowering (Mar–)Apr–Jul(–Aug). +
ovatelanceolate +
unequal +  and subequal +
acute +  and short-acuminate +
Rep. (Annual) Arkansas Geol. Surv. +
bearing subulate enations +, hairy +  and bristly +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
exalbuminous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
erect +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Keerlia de +
Aphanostephus skirrhobasis var. skirrhobasis +
Aphanostephus skirrhobasis +
variety +
tubular +
puberulent +  and hirsuto-pilose +
5 cm50 mm <br />0.05 m <br /> (45 cm450 mm <br />0.45 m <br />) +