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

52. Erigeron sivinskii G. L. Nesom, Phytologia. 71: 416. 1992.

Sivinski’s fleabane

Perennials, 5–8 cm; taprooted, caudex branches relatively short, thick, retaining old leaf bases. Stems erect (greenish), closely strigose (hairs white, equal), eglan-dular. Leaves basal (persistent, persistent portions relatively short and broad) and cauline (petioles erect, greenish, bases broadened or not, not thickened and whitish-indurate); blades linear, 12–30 × 0.5–0.8 mm, cauline unreduced for ± 1 / 2 stems, margins entire, eciliate, faces sparsely strigose, eglandular. Heads 1. Involucres 5–6 × (8–)10–14 mm. Phyllaries in 2–3 series (greenish, relatively thinly herbaceous), sparsely hirsuto-pilose along midribs, minutely glandular. Ray florets 21–33; corollas white, with abaxial lilac midstripe, 7–9 mm, laminae coiling. Disc corollas 3–3.8 mm. Cypselae (narrowly oblong) 2.8–3.1 mm, 2(–3)–nerved, margins sparsely ciliate, faces glabrous; pappi: outer of setae, inner of 21–27 bristles.

Flowering May–Jun. Red clay slopes of Summerville Formation and eroded, shale slopes of the Chinle Formation, desert scrub and pinyon-juniper woodland; of conservation concern; 1700–2300 m; Ariz., N.Mex.


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