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FNA | Family List | FNA Vol. 21 | Asteraceae | Asteraceae tribe Heliantheae

187m.16. Asteraceae Martinov (tribe Heliantheae) subtribe Clappiinae H. Robinson, Phytologia. 41: 39. 1978.

Subshrubs or shrubs, 5–40 cm (often succulent or fleshy). Leaves mostly cauline; opposite (proximal) or distally or mostly alternate; sessile; blades mostly linear to filiform (terete or subterete), margins entire, faces glabrous. Heads radiate, borne singly. Calyculi 0. Involucres hemispheric or obconic. Phyllaries persistent, 12–16 in 2–4+ series (distinct, obovate or ovate to lanceolate or linear, unequal, striate with resinous nerves in Clappia). Receptacles convex, usually epaleate (paleae rarely scattered, subulate scales; receptacles sometimes with setiform or subulate enations). Ray florets 2–11 or 10–15, pistillate, fertile; corollas yellowish or yellow. Disc florets 20–100+, bisexual, fertile; corollas yellowish or yellow, tubes shorter than to longer than funnelform throats, lobes 5, deltate to narrowly lance-ovate; anther thecae pale; stigmatic papillae in 2 lines. Cypselae clavate to columnar (10–12-ribbed, sparsely hairy); pappi persistent, either of 12–25 subulate scales in 1 series, or of ca. 50 bristles or setiform scales in 3–4 series.

Genera 2, species 3 (2 genera, 3 species in the flora): sw United States, Mexico.

Traditionally, Clappia has been included in Helenieae and Pseudoclappia in Senecioneae. H. Robinson (1981) suggested that the two genera are related to Varilla (Varillinae).

1 Ray florets 10–15; pappi of 12–25 subulate scales in 1 series   328 Clappia, p. 251
+ Ray florets 2–4; pappi of ca. 50 bristles or setiform scales in 3–4 series   329 Pseudoclappia, p. 252

Lower Taxa


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