Vasilis Teodoridis:
Aristolochiaceae | Asarum
1. Asarum caudigerum Hance; J. Bot. 19: 142. 1881.
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Asarum arrhizoma H. Léveillé & Vaniot; A. caudigerum var. leptophyllum (Hayata) S. S. Ying; A. caudigerum var. triangulare (Hayata) S. S. Ying; A. leptophyllum Hayata; A. leptophyllum var. triangulare Hayata.
Herbs. Rhizomes vertical; 2-4 mm in diam.; internodes less than 1 cm. Leaves paired; petiole 5-20 cm; villous; leaf blade adaxially dark green with white blotches along veins; broadly ovate; triangular-ovate; or ovate-cordate; 4-10 x 3.5-10 cm; abaxial surface densely pubescent; adaxial surface sparsely pubescent; base auriculate or cordate; lateral lobes 3-4 x 3-3.5 cm; apex acute or long acuminate; cataphylls ovate or ovate-lanceolate; 0.8-1.3 x 0.4-0.6 cm. Peduncle erect to ascending; 1-2 cm. Calyx green to purplish green; ± campanulate; 2-5 x 1-2 cm; sepals free beyond attachment to ovary; abaxially white villous; pseudotube subglobose; 0.6-1.0 x 0.9-1.5 cm; lobes erect or spreading; 1-3 x 0.4-1.2 cm; base ovate-oblong; apex abruptly narrowed to a slender cauda 10-25 mm. Stamens 12; filaments as long as anthers; connectives extended beyond anthers; ligulate to awl-shaped. Ovary inferior. Styles connate; apex 6-cleft; lobes entire; stigmas terminal. Fl. Mar-May.
Mixed forests; mountain slopes; along streams; 300-1700 m. Fujian; Guangdong; Guangxi; Guizhou; Hubei; Hunan; Sichuan; Taiwan; Yunnan [Vietnam].