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FNA | Family List | FNA Vol. 21 | Asteraceae | Wyethia

8. Wyethia arizonica A. Gray, Proc. Amer. Acad. Arts. 8: 655. 1873.

Plants 20–30(–100) cm. Basal leaves: blades elliptic or lance-elliptic to lanceolate, 12–30 cm, margins entire, not ciliate, faces usually ± hirsutulous or scabrellous, sometimes glabrate; cauline leaves mostly smaller, narrower, distal-most usually petiolate, rarely sessile and clasping. Heads borne singly or 2–4+ in ± corymbiform arrays. Involucres turbinate to hemispheric, 18–25+ mm diam. Phyllaries 16–34, subequal, ± herbaceous, margins ciliate, faces glabrous or strigillose to hispidulous; outer 18–22(–30) mm (not or seldom surpassing discs). Ray florets 11–12; laminae (25–)35–50 mm (abaxially hirsutulous). Cypselae 9–10 mm, glabrous. 2n = 38.

Flowering Apr–Jun. Meadows, openings in pine, oak, or spruce-fir forests; 600–2200(–3000) m; Ariz., Colo., N.Mex., Utah.

At the northern margin of the range, glabrate plants with the general habit of Wyethia arizonica (introgressants with W. amplexicaulis) exhibit greater frost-hardiness (a characteristic of W. amplexicaulis) than do other members of the species.


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