Deut. Bot. Herb.-Buch,87. 1841
n North America, centered in n Eurasia.
Species 40–50 (6 in the flora).
Species of Tephroseris are variable and poorly defined; their nomenclature is complex. The present treatment is provisional.
Tephroseris has been treated within Senecio in most North American floristic studies (T. M. Barkley 1999). Moreover, the tradition has been to treat much of the variation as varieties or subspecies within a broadly circumscribed Senecio (Tephroseris) atropurpureus (e.g., Barkley 1978; E. Hultén 1968; H. J. Scoggan 1978–1979, part 4; S. L. Welsh 1974); current thought is to recognize more species and thereby bring North American species concepts more into accord with those of Russian botanists (e.g., S. S. Kharkevich 1992, vol. 6; I. M. Krasnoborov 1997, vol. 13; E. Wiebe 2000). The circumscription of Tephroseris was discussed by B. Nordenstam (1978).
The Eurasian Tephroseris atropurpureus (Ledebour) B. Fedtschenko, in the strict sense, and T. subfrigida (Komarov) Holub may occur in far western Alaska. The former resembles T. frigida; it has smaller heads, narrower, purplish phyllaries, and a different “aspect.” Tephroseris subfrigida is a relatively tall, thin plant with phyllaries purplish on the distal one-third; the bases of the heads have a light yellowish, non-woolly tomentum.
|1||Annuals or biennials (rarely perennials; caudices fibrous-rooted); leaves basal and cauline (basal and proximal sometimes withering before flowering, mid-stem leaves prominent at flowering); heads (4–)6–20(–40+)||Tephroseris palustris|
|1||Perennials (rhizomes spreading, sometimes suberect); leaves basal and cauline (basal and proximal cauline usually evident at flowering; distal cauline smaller, bractlike); heads 1–4(–6+)||> 2|
|2||Basal and proximal leaves: margins usually irregularly toothed; phyllaries brown-woolly||Tephroseris kjellmanii|
|2||Basal and proximal leaves: margins subentire or denticulate (if shallowly toothed, phyllaries yellow-hairy at bases); phyllaries ± villous or floccose- or lanate-tomentose (hairs yellow, white, or purplish), sometimes glabrate||> 3|
|3||Phyllaries floccose-tomentose (hairs yellow)||Tephroseris yukonensis|
|3||Phyllaries ± villous or floccose- or lanate-tomentose (hairs white or purplish), sometimes glabrate||> 4|
|4||Involucres tapering to peduncles; phyllaries (and distal herbage) ± villous (at least some hairs purplish or with purplish cross-walls)||Tephroseris frigida|
|4||Involucres ± abruptly contracted to peduncles; phyllaries floccose- or lanate-tomentose (hairs white) to unevenly glabrate||> 5|
|5||Phyllaries purple (at least distal 1/3); corollas orange or orange-yellow; laminae of ray corollas usually 15–25 mm||Tephroseris lindstroemii|
|5||Phyllaries greenish (tips sometimes purplish); corollas yellow; laminae of ray corollas (8–)10–15 mm||Tephroseris tundricola|
|Author||Theodore M. Barkley† + and David F. Murray +|
|Basionym||Cineraria Tephroseris +|
|Etymology||Greek tephros, ashlike or ash-colored, and seris, endive or chicory, presumably alluding to color of the densely woolly leaves +|
|Illustrator||Yevonn Wilson-Ramsey +|
|Taxon name||Tephroseris +|
|Taxon parent||Asteraceae tribe Senecioneae +|
|Taxon rank||genus +|
|Volume||Volume 20 +|