| Asteraceae |
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%20GRIERSON_jpg.jpg) Tanacetum tomentellum (BOISS.) GRIERSON |
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Tanacetum L. (EMEND. BRIQ.) |
| T. tomentellum (Boiss.) Grierson in Notes R.B.G. Edinb. 33:435 (1975). Syn: Pyrethrum tomentellum Boiss., Fl. Or. 3:354 (1875)! Figure 14, p. 267. Herb with woody, creeping rootstock. Stems 23-30 cm, grey or silvery-white tomentose, leafy. Basal leaves 5-7 cm, on 2-3.5 cm petioles, 2-pinnatisect, ovate in outline, primary segments 3-4-paired, up to 2 cm, each bearing 3-4 segments 5-7.5 x 1.5 mm, oblanceolate, entire or 3-5-toothed, subacute at apex, ± densely silvery-white tomentose; cauline leaves similar, shorter, uppermost pinnatisect. Capitula 8-30 in dense corymbs, base turbinate. Involucre 5-6 mm broad, cylindrical-campanulate; phyllaries ± densely tomentose, outer lanceolate, acute, 5x1 mm, carinate, inner ones linear-lanceolate, 6x1.5 mm, with short obtuse scarious apices. Female flowers absent. Hermaphrodite flowers 20-30, corollas 2.5-3 mm. Achenes yellowish-brown, glandular, 5-ribbed, 2.5-3 mm; corona unilateral, developed on posterior side only, 1.25-1.5 mm, irregularly toothed at apex. Fl. 8. Metamorphic rock ledges and crevices, 1900-2300 m. Type: [Turkey B9 Bitlis] ab urbe Bitlis orientem versus, Kotschy 481 (iso. K!). S.E. Anatolia. B8 Bitlis: Kambos Da. nr Çatak, 2200-2300 m, McNeill 631! Anti-Lebanon (a more slender variant ?). The differences between this species and T. argenteum are obvious when viewing the specimens, but are difficult to express. The leaves generally bear more numerous primary segments but this is not always the case. The number of capitula that make up the terminal corymb is comparable, but in T. argenteum the corymb is more compact and less branched and the branches tend to be close together near the apex of the stem. In the present species, however, the branches are more widely separated. The involucre in T. argenteum is campanulate-hemispherical, rounded at the base, 4-5 mm long; in T. tomentellum cylindrical and turbinate at the base, 6-8 mm. All of the majority of the phyllaries of the former are scarious at the apex and only slightly or not at all carinate. Only the inner phyllaries of T. tomentellum are scarious-tipped, the outer are non-scarious and distinctly carinate. The achenes and corona of T. argenteum are distinctly smaller. Species doubtfully recorded Chrysanthemum montis-stellarum Bornm. in Feddes Rep. Beih. 89:399 (1944). Probably conspecific with Anthemis anthemiformis (see p. 191) |