细裂假还阳参 xi lie jia huan yang shen

Basionym: Prenanthes diversifolia Ledebour ex Sprengel, Syst. Veg. 3: 657. 1826; Crepis tenuifolia Willdenow var. altaica Bongard & C. A. Meyer; Youngia diversifolia (Ledebour ex Sprengel) Ledebour; Y. tenuifolia (Willdenow) Babcock & Stebbins subsp. diversifolia (Ledebour ex Sprengel) Babcock & Stebbins.

Herbs 18-40 cm tall, perennial, rosulate. Taproot strong, woody. Caudex woody, branching with age, with residues of old leaf bases. Stems solitary or few, erect, branching from base or middle, leafy. Rosette leaves petiolate; petiole 2-6 cm, long brown tomentose, base expanded; leaf blade narrowly elliptic, 6-9 × 2-4 cm, pinnatipartite to pinnatisect; lateral lobes 6-9 pairs, lanceolate to linear, margin entire or with few teeth; 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 10-16 florets. Involucre broadly cylindric, 1-1.4 cm. Phyllaries abaxially dark green, sparsely curled pilose, frequently crested or corniculate below apex; outer phyllaries few, ovate-lanceolate, longest 1/4-1/3 as long as inner ones, apex acute; inner phyllaries 8. Achene brown to blackish, fusiform, 5-7.5 mm, with 10-14 ribs, shortly scabrid, apex attenuate to weakly beaked. Pappus white, 6-7 mm. Fl. and fr. Jul-Sep. 2n = 15, 20.

Mountain slopes, rock slopes, gravelly areas on floodplains; 1800-4700 m. Gansu, Xinjiang, Xizang [N India, Kashmir, Kazakhstan, Mongolia, Nepal, E Russia].

Crepidiastrum diversifolium is a triploid or tetraploid taxon closely related to and perhaps not sharply delimited from C. tenuifolium, being distinguished mainly by larger involucres and florets. It was considered conspecific by Sennikov and I. D. Illarionova (Komarovia 5: 93. 2008, under Crepidifolium); closer investigations are necessary.