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FOC | Family List | FOC Vol. 20-21 | Asteraceae | Crepidiastrum

7. Crepidiastrum tenuifolium (Willdenow) Sennikov, Bot. Zhurn. 82(5): 115. 1997.

细叶假还阳参 xi ye jia huan yang shen

Crepis tenuifolia Willdenow, Sp. Pl. 3: 1606. 1803; Barkhausia tenuifolia (Willdenow) Candolle; Berinia tenuifolia (Willdenow) Schultz Bipontinus; Chondrilla baicalensis (Ledebour) Schultz Bipontinus; Crepis altaica (Babcock & Stebbins) Roldugin; C. baicalensis Ledebour; C. pulcherrima Fischer ex Link; Geblera tenuifolia (Willdenow) Kitagawa; Hieracioides tenuifolia (Willdenow) Kuntze; Lagoseris tenuifolia (Willdenow) Reichenbach; Youngia altaica (Babcock & Stebbins) Czerepanov; Y. tenuifolia (Willdenow) Babcock & Stebbins; Y. tenuifolia subsp. altaica Babcock & Stebbins.

Herbs 10-70 cm tall, perennial, rosulate. Taproot strong, woody. Caudex woody, branching with age, with residues of old leaf bases. Stems solitary or few, erect, usually branching in upper half, leafy; branches ascending-erect. Rosette leaves numerous; petiole 3-9 cm, adaxially long brown tomentose, base ± expanded; leaf blade narrowly elliptic, 7-17 × 2-5 cm, pinnatisect to pinnatipartite; lateral lobes 6-12 pairs, opposite to alternate, very variable, narrowly elliptic, lanceolate, or linear, undivided or sparsely divided with linear segments, apex acute; terminal lobe similar to lateral ones. Stem leaves similar to rosette leaves but gradually smaller and less or not divided upward on stem. Synflorescence corymbiform or paniculiform-corymbiform, with some capitula. Capitula with 10-15 florets. Involucre narrowly cylindric, 8-11 mm. Phyllaries dark green, abaxially sparsely curled pilose or rarely glabrous, frequently crested or corniculate below apex, apex acute; outer phyllaries few, narrowly ovate, longest 1/3-1/2 as long as inner ones, apex acute; inner phyllaries 8. Achene black to blackish, fusiform, 4-6 mm, with 10-12 ribs, shortly and rather inconspicuously scabrid, apex attenuate to weakly beaked. Pappus white, 4-6 mm. Fl. and fr. Jul-Sep. 2n = 10.

Mountain slopes, meadows, floodplains, by water, gravelly areas; 1500-4000 m. Hebei, Heilongjiang, Jilin, Liaoning, Nei Mongol, Xinjiang, Xizang [Mongolia, E Russia].

The related species, previously treated as Youngia serawschanica (B. Fedtschenko) Babcock & Stebbins (incl. Y. distincta (Popov & Vvedensky) Babcock & Stebbins), distributed in Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan, and distinguished by a pale brownish pappus and inner phyllaries often with long pale bristles on the midvein, was also included for Xinjiang by C. H. An (Fl. Xinjiang. 5: 451. 1999), but this record is presumably erroneous (Sennikov & I. D. Illarionova, Komarovia 5: 96. 2008, under Crepidifolium).


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