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

3. Thelesperma subnudum A. Gray, Proc. Amer. Acad. Arts. 10: 72. 1874.

Thelesperma caespitosum Dorn; T. marginatum Rydberg; T. pubescens Dorn; T. pubescens var. caespitosum (Dorn) C. J. Hansen; T. subnudum var. alpinum S. L. Welsh; T. subnudum var. marginatum (Rydberg) Cronquist; T. subnudum var. pubescens (Dorn) S. L. Welsh; T. windhamii C. J. Hansen

Perennials, 10–30(–40+) cm (caudices often woody). Cauline leaves mostly crowded over proximal 1/4(–1/2) of plant heights, internodes mostly 1–5(–35 mm); lobes mostly oblanceolate to linear, (5–)10–35(–45+) × (1–)2–3(–5) mm. Calyculi of 7–9 deltate to lance-linear bractlets 2–4+ mm. Ray florets 0, or 8; laminae yellow, (6–)12–20+ mm. Disc corollas yellow, sometimes with red-brown nerves, throats equal to or longer than lobes. Cypselae 5–7 mm; pappi usually 0, rarely 0.1–0.5 mm. 2n = 22, 24.

Flowering May–Sep. Openings in pinyon/juniper or yellow-pine forests, often on talus or "balds"; 1000–2900 m; Alta.; Ariz., Colo., Mont., Nev., N.Mex., N.Dak., Utah, Wyo.

As here circumscribed, Thelesperma subnudum includes plants that have been treated as distinct species and/or varieties (some of which have been treated as of conservation concern). See C. J. Hansen et al. (2002) for an alternate interpretation of T. subnudum.


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