Erigeron melanocephalus

(A. Nelson) A. Nelson

Bull. Torrey Bot. Club 26: 246. 1899.

Common names: Black-head fleabane
Basionym: Erigeron uniflorus var. melanocephalus A. Nelson Wyoming Agric. Exp. Sta. Bull. 28: 131. 1896
Treatment appears in FNA Volume 20. Treatment on page 323. Mentioned on page 266.

Perennials, 3–12(–21 at lower elevations) cm; fibrous-rooted, rhizomatous, caudices decumbent, often branched, rhizomelike, sometimes taprootlike. Stems erect, distally villous (hairs with black cross walls), minutely glandular near heads. Leaves mostly basal (persistent), some cauline; blades spatulate to oblanceolate, (10–)20–50(–150) × 4–6(–15) mm, cauline linear, bractlike, margins entire (apices rounded to retuse), faces glabrous or sparsely hirsute, eglandular. Heads 1. Involucres 6–9 × 10–14 mm. Phyllaries in 2(–3) series, sparsely villoso-sericeous (hairs flattened, cross walls black, imparting distinct black color to involucres), glandular. Ray florets 45–74; corollas white to purple, 7–11 mm (mostly 1–2 mm wide), laminae spreading, tardily coiling. Disc corollas 2.4–3.2 mm. Cypselae (oblanceoloid-oblong) 2–2.3 mm, 2-nerved, faces strigoso-hirsute; pappi: outer of setae, inner of 15–30 bristles. 2n = 18.

Phenology: Flowering Jul–Aug.
Habitat: Rocky slopes, talus, alpine and subalpine meadows, subalpine spruce-fir
Elevation: 3100–4000 m


Selected References


Lower Taxa

... more about "Erigeron melanocephalus"
Guy L. Nesom +
(A. Nelson) A. Nelson +
Erigeron uniflorus var. melanocephalus +
Black-head fleabane +
Colo. +, N.Mex. +, Utah +  and Wyo. +
3100–4000 m +
Rocky slopes, talus, alpine and subalpine meadows, subalpine spruce-fir +
Flowering Jul–Aug. +
Bull. Torrey Bot. Club +
Achaetogeron +  and Trimorpha +
Erigeron melanocephalus +
Erigeron +
species +