Panarctic Flora

862804 Tephroseris integrifolia (L.) Holub

• Holub, Folia Geobot. Phytotax. 8: 173 (1973). - Othonna integrifolia L., Sp. Pl.: 925 (1753). Described from Europe and Siberia. Type not designated (Jarvis 2007: 715). - Senecio integrifolius (L.) Clairv., Man. Herbor. Suisse: 241 (1811).
• Cineraria campestris Retz., Fl. Scand. Prodr.: 159 (1779). Described from Sweden. - Senecio campestris (Retz.) DC., Prodr. 6: 361 (1838). - Tephroseris campestris (Retz.) Rchb., Fl. Saxon.: 147 (1842).

2n= (1) 46-48 48 (2x, x = 24). - Europe (C), Russia (N, S), Siberia (N, S), Far East (N). - Numerous reports.
(2) 64 (4x, x = 16). - Europe (Slovakia). - Májovský et al. (1970); Váchová (1970).
Zhukova and Petrovsky (1987b) assigned the number of 2n = 48 to Senecio integrifolius, that of 2n = ca. 80 to S. tundricola. As seen from the numbers above, 2n = ca. 48 is known from a wide range including central Europe and 2n = 64 from central Europe.
Not included: Reports of the higher numbers of 2n = 72, 90, and 96 from the northern Russian and Siberian areas have been transferred to Tephroseris tundricola.
A report of 2n = 18 from the Caucasus (Magulaev 1982). Such low-ploid counts are otherwise not reported for this genus (note the American assumption of x = 24). The affinity of the Caucasus plant is uncertain.

Geography: European - Asian: NOR RUS SIB RFE.

Notes: Murray and Elven: Tephroseris integrifolia s. lat. is a large and intricate group where the plants in western and central Europe, European Russia, and Siberia often are divided on several races or species. We accept a collective species (except for T. lenensis) but an extensive disintegration of T. integrifolia s. lat. might be expected.

The (collective) species reaches the Arctic in one major area in northern Europe and in another in northeastern Siberia and the Russian Far East, but these two areas with connection through central and southern Siberia and central Asia. The morphological variation and taxonomy is complicated and not analysed by any modern means. There is a significant variation in the reported chromosome numbers. Löve and Löve (1975a) accepted only reports of 2n = 46-48 for this species, which they stated to be purely Eurasian. Among their accepted reports is one of Johnson and Packer (1968) from Ogotoruk Creek in northwestern Alaska (probably T. lindstroemii). Also their assignment of the Russian Far East counts should be checked. The most reliable arctic chromosome number reports for this species seem to be Sokolovskaya and Strelkova (1941) of 2n = 46 from Kolguev and Zhukova and Petrovsky (1987b) of 2n = 48 from northeastern Asia.

Wiebe (1997) accepted only a collective T. integrifolia for Siberia. The northwestern Siberian plants most probably belong to T. integrifolia s. str. The northeastern Siberian plants have been assigned by other authors to the related T. lenensis, also accepted by Barkalov (1992) for non-arctic parts of the Russian Far East. It reaches the Arctic along the lower Lena River and is provisionally entered below.

Wiebe reported another, related species to be present in arctic Yakutia but without specification of localities: T. kirilowii (Turcz. ex DC.) Holub, Folia Geobot. Phytotax. 8: 173 (1973) [Senecio kirilowii Turcz. ex DC., Prodr. 6: 361 (1838), described from eastern Siberia]. In absence of exact records from arctic localities, we have not evaluated or included it.