Jacobaea racemulifera (Pavlov) C. Ren & Q.E. Yang, 2021

Fei, Wen-Qun, Li, Hui-Min, Ren, Chen & Yang, Qin-Er, 2021, Nuclear ITS / ETS sequence data indicate the membership of Senecio racemulifer, but not S. acutipinnus and S. graciliflorus, within the genus Jacobaea (Asteraceae, Senecioneae), Phytotaxa 512 (3), pp. 129-146 : 140

Jacobaea racemulifera (Pavlov) C. Ren & Q.E. Yang , comb. nov. Senecio racemulifer Pavlov (1950: 21) . Figs. 1–3

Type :— Uzbekistan: Tashkent , Bostanliq [Bostandyk], in a dry rocky channel under a large snowfield, at the top of Aksar-say [in Russian], 24 Jul 1949, N. V . Pavlov 150 (holotype: AA, not seen; isotype: MW!) .

Description:—Herbs, perennial, rhizomatous. Stems few, weakly glaucous, glabrous, sometimes pubescent only in inflorescence, simple or branching in upper part, 45–70 cm high. Leaves ovate or oblong-ovate, 5.0– 10 cm long, 1.0– 3.5 cm broad, herbaceous, green, glabrous on both surfaces, apically obtuse or shortly acuminate, marginally entire, pinnatilobed or less often with few teeth, narrowed toward base; basal and lower stem leaves shortly petiolate, petiole ca. 1 cm long; upper stem leaves smaller and narrower, subsessile. Inflorescence corymbose. Capitula several, long pedunculate; peduncle 1.5–4.5 cm long, distally white puberulous; bracts narrowly linear, 0.7–1.0 cm long. Involucres 6–8 mm long, 6–10 mm in diameter, calyculate; bracts of calyculus (supplementary bracts) 2–4, linear, subglabrous abaxially, 4–5 mm long; phyllaries ca. 11, oblong-obovate, 6–8 mm long, acute, white puberulous abaxially, distally brownish. Ray florets 4–6; corolla oblanceolate, yellow, ca. 15 mm long. Disk florets ca. 20; corolla yellow, ca. 7 mm long, with ca. 2.8 mm long tube and infundibuliform limb; lobes ovate-triangular, ca. 0.9 mm long, acute. Anthers linear, ca. 2.8 mm long, obtusely shortly auriculate at the base, appendages ovate-lanceolate; anther collars rather elongated, somewhat dilated at the base. Style arms ca. 1.5 mm long. Achenes (not fully mature) 2–3 mm long, cylindrical, glabrous. Pappus ca. 5 mm long, white. 2 n = 40.

Distribution:— Jacobaea racemulifera is distributed in China (Xinjiang), Kazakhstan, Kyrgyzstan, and Uzbekistan (Western Tian-Shan).

Figures

FIGURE 1. Isotype sheet of Senecio racemulifer (= Jacobaea racemulifera) kept at MW.

FIGURE 2. Selected specimens of Senecio racemulifer (= Jacobaea racemulifera) from Wuqia county in Xinjiang, China. A, B. Northwest Inst. Bot. Xinjiang Exped. 1726 (WUK). C, D. H.M. Li & Y.P. Zeng 599 (IBSC).

FIGURE 3. Senecio racemulifer (= Jacobaea racemulifera) in the wild (Wuqia county, Xinjiang, China).A. Habitat. B. Habit. C. Rhizome and roots. D. Basal to distal stem leaves. E. Synflorescence. F. Capitulum. G. Longitudinal section of involucre. H. Ray florets. I. Disc florets. Photographed by Hui-min Li.