Aphanostephus ramosissimus var. humilis

(Bentham) B. L. Turner & Birdsong

Phytologia 45: 501. 1980.

Basionym: Leucopsidium humile Bentham Pl. Hartw., 18. 1839
Synonyms: Aphanostephus arizonicus A. Gray Aphanostephus humilis (Bentham) A. Gray
Treatment appears in FNA Volume 20. Treatment on page 353.

Plants 6–15 cm. Involucres 4.7–7.5 mm. Ray-florets 26-–35. Cypselae (1.1–) 1.4–1.6 mm; pappi 0 or minutely ciliate rings 0.1–0.2 mm, sometimes nearly smooth. 2n = 8.


Phenology: Flowering Apr–Jun(–Oct).
Habitat: Sand and gravel bars, limestone soils, Larrea flats, mesquite savannas, roadsides, disturbed sites
Elevation: 700–1600 m

Distribution

V20-815-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (Nuevo León), Mexico (Tamaulipas), Mexico (Zacatecas)

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 +
(Bentham) B. L. Turner & Birdsong +
decurrent +
Leucopsidium humile +
broadly oblanceolate;linear-lanceolate +
rugulose +  and muricate +
barbellulate +  and barbellate +
not 2-lipped +  and actinomorphic +
yellow +  and white +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
subterete +, 4-angled +  and angular-columnar +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, N.Mex. +, Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +, Mexico (Nuevo León) +, Mexico (Tamaulipas) +  and Mexico (Zacatecas) +
700–1600 m +
glabrous +, strigose +, hirsute +  and hispid +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sand and gravel bars, limestone soils, Larrea flats, mesquite savannas, roadsides, disturbed sites +
straight +
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 +
0.47 cm4.7 mm <br />0.0047 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
deltate +
dentate to pinnatifid +  and entire +
pinnatifid +  and entire +
2-carpellate +
persistent +
acute +  and coroniform +
Flowering Apr–Jun(–Oct). +
ovatelanceolate +
unequal +  and subequal +
bearing subulate enations +, hairy +  and bristly +
0.1mm +  and 0.2mm +
setiform +
exalbuminous +
Illustrated +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
deflexed +, erect +  and decumbent or ascending +
appendaged +  and truncate +
papillate +  and smooth +
Aphanostephus arizonicus +  and Aphanostephus humilis +
Aphanostephus ramosissimus var. humilis +
Aphanostephus ramosissimus +
variety +
tubular +
hispidulo-puberulent +
10 cm100 mm <br />0.1 m <br /> (45 cm450 mm <br />0.45 m <br />) +