大头华蟹甲 da tou hua xie jia

Koyamacalia macrocephala H. Robinson & Brettell, Phytologia 27: 272. 1973, based on Cacalia macrocephala Handel-Mazzetti, Notizbl. Bot. Gart. Berlin-Dahlem 13: 633. 1937, not (Lessing) Kuntze (1891).

Stems erect, conspicuously striate, robust, 8-10 mm in diam. at base, fistulose, 80-100 cm tall, simple, sparsely puberulent, glabrescent. Leaves subradical, thickly papery, long petiolate; petiole 8-15 cm, stout, expanded and somewhat amplexicaul at base, sparsely puberulent or subglabrous; blade adaxially dark green, broadly ovate-orbicular, 14-16 × 20-30 cm, thickly papery, abaxially arachnoid, soon glabrescent, adaxially glabrous, veins prominent on both surfaces, base cordate, margin irregularly repand-denticulate, apex rounded, mucronate. Stem leaves bractlike, ovate-lanceolate, 2-3 cm × 4-6 mm, many veined, sparsely arachnoid, glabrescent, apex acuminate. Capitula large, 5-22, arranged in a terminal or compound corymb; peduncles 1-3.5 cm, stout, fulvous arachnoid; bracteoles 2 or 3, linear-lanceolate, 6-10 × 1-1.5 mm. Involucres obconic-campanulate, 13-15 × 6-10 mm; phyllaries 8, green, linear-oblong or linear-lanceolate, ca. 15 × 2-3.5 mm, herbaceous, glabrous or subglabrous, with puberulent tips and broadly scarious margins, obscurely 3-5-veined, apically acuminate. Ray florets 5 or 6, yellow, with 8-8.5 mm tube; lamina linear-oblong, 15-18 × 3-3.5 mm, 6- or 7-veined, apically minutely 2- or 3-dentate. Disk florets numerous; corolla yellow, 1.2-1.3 cm, with 5-5.5 mm tube and funnelform limb; lobes oblong-lanceolate, ca. 2 mm, apically acuminate; anthers oblong, 4-4.5 mm, shortly obtusely caudate, appendages ovate-oblong; style branches ca. 1.5 mm. Achenes cylindric, 5-6 mm, glabrous, ribbed. Pappus white, 1.3-1.5 cm, scabrid. Fl. Sep-Nov.

● W Hubei (near Yichang).