Sclerocarpus

Jacquin

Icon. Pl. Rar. 1: 17, plate 176. 1781.

Common names: Mexican bone-bract
Etymology: Greek skleros, hard, and karpos, fruit, alluding to hardened paleae enfolding disc cypselae
Treatment appears in FNA Volume 21. Treatment on page 137. Mentioned on page 135.
 TaxonIllustrator 
FNA21 P23 Sclerocarpus uniseria.jpegSclerocarpus uniserialis
Tithonia thurberi
Simsia calva
Linny Heagy
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Annuals [perennials or subshrubs], 60–200 cm. Stems sprawling to erect, branched from bases or ± throughout. Leaves mostly cauline; opposite (proximal) or alternate; petiolate [sessile]; blades 3-nerved, ovate to rhombic or lanceolate, bases cuneate to rounded, margins coarsely toothed, faces glabrous or ± scabrous. Heads radiate, borne singly. Involucres rotate to hemispheric, 12–20 mm diam. Phyllaries persistent, 5–8 [–21] in 1 (–2) series (green, oblong to linear). Receptacles low-conic, paleate (paleae each closely investing subtended floret, each forming a hard perigynium around a fruit and shed with it). Ray-florets 5–8, neuter; corollas (readily falling) yellow to orange. Disc-florets 10–50, bisexual, fertile; corollas usually yellow to orange, sometimes with purple, tubes much shorter than cylindric throats, lobes 5, lance-linear. Cypselae (within perigynia) weakly compressed, obliquely obovoid or arcuate (glabrous); pappi 0, or coroniform (of distinct or connate scales or bristles). x = 12.

Distribution

s United States, Mexico, Central America, one species in Old World tropics

Discussion

Species ca. 12 (1 in the flora).

... more about "Sclerocarpus"
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 +
Jacquin +
cuneate +  and rounded +
ovate;rhombic or lanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Mexican bone-bract +
usually yellow +  and orange +
hairy +  and glabrous +
arcuate +, obovoid +  and compressed +
fertile +  and bisexual +
fertile +  and bisexual +
s United States +, Mexico +, Central America +  and one species in Old World tropics +
Greek skleros, hard, and karpos, fruit, alluding to hardened paleae enfolding disc cypselae +
scabrous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
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 +
Icon. Pl. Rar. +
bearing subulate enations +, hairy +  and bristly +
feddema1966a +
exalbuminous +
sprawling +  and erect +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Sclerocarpus +
Asteraceae (tribe Heliantheae) subtribe Helianthinae +
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 +