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FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Stephanomeria

4d. Stephanomeria exigua Nuttall subsp. exigua

Stephanomeria pentachaeta D. C. Eaton; S. exigua var. pentachaeta (D. C. Eaton) H. M. Hall; S. schottii (A. Gray) A. Gray

Heads in paniculiform arrays. Peduncles 10–40 mm, glabrous or sparsely glandular . Calyculi of appressed bractlets. Involucres glabrous or sparsely glandular. Florets 5–8. Cypselae 2.6–3.2 mm; pappi of 5–13 white to light tan bristles (widened bases persistent, bases connate in groups of 2–4, if bristles 5, breaking off completely, bristles plumose on distal 50%). 2n = 16.

Flowering May–Jul. Sandy soils, deserts, sagebrush, creosote bush, pinyon-juniper woodlands, Joshua Tree communities; 100–2000 m; Ariz., Calif., Colo., Idaho, Nev., N.Mex., Oreg., Tex., Utah, Wash; Mexico (Baja California).

Subspecies exigua is morphologically variable. Plants with pappi of 5 bristles (often called Stephanomeria pentachaeta) are found throughout its distribution; they are fully interfertile with plants having more bristles. Stephanomeria schottii A. Gray from southern Yuma County, Arizona, described as having a pappus of 4–6 bristles, "sparsely short-plumose toward the summit," appears to be a synonym of subsp. exigua.


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