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FNA | Family List | FNA Vol. 20 | Asteraceae | Aphanostephus

1. Aphanostephus skirrhobasis (de Candolle) Trelease, Rep. (Annual) Arkansas Geol. Surv. 4: 191. 1891.

Arkansas lazydaisy

Keerlia skirrhobasis de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 310. 1836

Annuals, 5–45 cm; vestiture hirsuto-pilose and/or puberulent, stem hairs spreading to deflexed, 0.1–0.3 mm. Phyllary apices acute to short-acuminate. Ray florets (10–)25–45. Disc floret corollas: bases (mature) bulbous-swollen, indurate. Cypselae: hairs apically 1-directionally coiled; pappi usually coroniform, uneven, rarely of acute to awn-tipped scales 0.2–2 mm.

Varieties 3 (3 in the flora): s United States, n Mexico.

1 Leaves thickened, densely, almost felty gray-hairy; sand dunes along Gulf Coast   1c Aphanostephus skirrhobasis var. thalassius
+ Leaves not strongly thickened or felty gray-hairy; sandy soils, interior localities   (2)
2 (1) Pappi of acute or awn-tipped scales or setiform scales 0.4–2 mm   1a Aphanostephus skirrhobasis var. kidderi
+ Pappi coroniform, uneven, ciliate, 0.1–0.3 mm, rarely of awn-tipped scales   1b Aphanostephus skirrhobasis var. skirrhobasis


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