圆叶苦荬菜 yuan ye ku mai cai

Ixeris capillaris Nakai; I. stolonifera subsp. capillaris (Nakai) Kitamura; I. stolonifera var. sinuata (Makino) Takeda; Lactuca nummulariifolia H. Léveillé & Vaniot; L. stolonifera (A. Gray) Bentham ex Maximowicz; L. stolonifera var. sinuata Makino.

Herbs 10-15 cm tall, perennial, rosulate, glabrous. Taproot with lateral shoot-bearing roots, producing secondary leaf rosettes. Stems several, flagelliform, long creeping above ground; nodes 1-7 cm apart, most with adventitious roots and a single leaf. Flowering stems from rosettes and leaf axils of creeping stems, erect, to 15 cm, leafless. Leaves present at anthesis; petiole 1-4 cm; leaf blade orbicular, broadly elliptic, ovate, or obovate, 1-3 × 0.8-1.5 cm, undivided or weakly pinnatifid, base rounded, cuneate, or truncate, margin entire, apex obtuse, rounded, or emarginate and often mucronulate; lateral lobes (if present) 1(or 2) pair(s), on basal half of leaf blade, triangular, small. Synflorescence laxly and weakly corymbiform, with 1-6 capitula. Capitula with 15-25 florets; peduncle capillaceous, to 10 cm. Involucre narrowly cylindric, 7-8 × 3-4 mm at anthesis, to 10 mm in fruit. Phyllaries abaxially glabrous; outer phyllaries ovate to lanceolate, longest to 2(-3) mm, apex acute; inner phyllaries 8, apex acute to obtuse. Florets yellow. Anther tube and style greenish to blackish upon drying. Achene brown, fusiform, 4-6 mm, apex attenuate into a filiform 1.5-3 mm beak. Pappus 4-5 mm. Fl. and fr. May-Oct. 2n = 16*.

Moist areas on gravelly mountain slopes; 1500-2000 m. ?Anhui, Jiangsu, Jiangxi, Taiwan, Zhejiang [Japan, Korea; introduced to E North America].