Sclerocarpus uniserialis

(Hooker) Bentham & Hooker f. ex Hemsley

Biol. Cent.-Amer., Bot. 2: 164. 1881.

Illustrated
Basionym: Gymnopsis uniserialis Hooker Icon. Pl. 2: plate 145. 1837
Synonyms: Sclerocarpus uniserialis var. austrotexanus B. L. Turner
Treatment appears in FNA Volume 21. Treatment on page 137.

Stems often densely hairy (hairs whitish, pustule-based, antrorse-appresssed, stiff). Leaf-blades 2–5 cm, margins toothed mostly distally, apices acute. Peduncles 3–10 cm. Ray laminae rotundly elliptic, 5–15 mm. Disc corollas usually yellow with reddish veins (sometimes purple). Cypselae: perigynia brown, ± warty. 2n = 24.


Phenology: Flowering late summer–winter.
Habitat: Disturbed sites, caliche, limestone, and sandy soils
Elevation: 0–300 m

Distribution

V21-334-distribution-map.gif

Tex., Mexico, Central America (Guatemala)

Discussion

Of the four varieties sometimes recognized within Sclerocarpus uniserialis, only var. uniserialis and var. austrotexanus B. L. Turner occur within the flora area. Variety austrotexanus is said to differ by having the disc corollas longer and more uniformly purple and by growing mainly on dunes.

Selected References

None.

Lower Taxa

None.
... more about "Sclerocarpus uniserialis"
not tailed +, rounded +  and obtuse +
pale +  and dark +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Neil A. Harriman +
(Hooker) Bentham & Hooker f. ex Hemsley +
cuneate +  and rounded +
Gymnopsis uniserialis +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
ovate;rhombic or lanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
usually yellow +  and orange +
hairy +  and glabrous +
arcuate +, obovoid +  and compressed +
fertile +  and bisexual +
fertile +  and bisexual +
Tex. +, Mexico +  and Central America (Guatemala) +
0–300 m +
scabrous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Disturbed sites, caliche, limestone, and sandy soils +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
rotate;hemispheric +
alternate +  and opposite +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
coroniform +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering late summer–winter. +
Biol. Cent.-Amer., Bot. +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +
sprawling +  and erect +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Sclerocarpus uniserialis var. austrotexanus +
Sclerocarpus uniserialis +
Sclerocarpus +
species +
cylindric +
toothed +  and entire +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
shrub +  and subshrub +