[For "Dr. Asahel Clapp, of New Albany, Indiana, one of the most zealous botanists of our Western States…." Quoted from protologue.]

John L. Strother

Subshrubs or shrubs, to 30+ cm (± succulent or fleshy). Stems mostly erect, branched from bases or throughout. Leaves cauline; opposite (proximally) or mostly alternate; sessile; blades linear (subterete), margins mostly entire, rarely distally 3-lobed, faces glabrous. Heads radiate, borne singly. Involucres hemispheric, 6–8 mm diam. Phyllaries 12–16 in 3–4+ series (broadly ovate to obovate, unequal, striate with resinous nerves). Receptacles convex, epaleate (± densely setose with subulate enations). Ray florets 10–15, pistillate, fertile; corollas yellow. Disc florets 30–100+, bisexual, fertile; corollas yellow; tubes about equaling or longer than narrowly funnelform throats; lobes 5, narrowly deltate. Cypselae columnar to clavate (10–12-ribbed, sparsely hairy on ribs); pappi persistent, of 12–25 subulate scales in 1 series. x = 16.

Species 1: Texas, Mexico.

Lower Taxon

• Clappia suaedifolia A. Gray