34. Asarum longerhizomatosum C. F. Liang & C. S. Yang, Acta Phytotax. Sin. 13(2): 21. 1975.
长茎金耳环 chang jing jin er huan
Herbs slender, with fibrous roots. Rhizomes horizontal, 2-3 mm in diam., internodes 6-12 cm. Leaves solitary; petiole 7-18 cm, glabrous; leaf blade uniformly colored, oblong-ovate or narrowly elliptic-ovate, 8-14 × 5-8 cm, abaxial surface glabrous, adaxial surface sparsely pubescent, more densely so along veins and margin, base auriculate or nearly hastate, lateral lobes nearly triangular, 3-3.5 × 2-2.5 cm, apex acuminate; cataphylls narrowly ovate, 1-1.5 × 0.5-0.7 cm. Flowers solitary. Peduncle ascending, ca. 1.5 cm. Calyx purplish green, urceolate-campanulate, 2-3 × 2-3 cm; sepals connate beyond attachment to ovary, abaxially glabrous; tube cylindric, ca. 1.5 × 1 cm, strongly constricted at throat, adaxially longitudinally corrugate, orifice ring ca. 2 mm wide; lobes broadly ovate, ca. 1.5 × 1.5 cm, base with papillate-corrugate area. Stamens 12; filaments much shorter than anthers; connectives slightly extended beyond anthers, ligulate. Ovary half-inferior. Styles free, apex 2-forked; stigmas lateral. Fl. Jul-Dec.
* Thickets, open mountain slopes, moist shady areas; ca. 200 m. Guangxi.
The protologue apparently cites two types, “C. L. Chang 001” and “C. L. Chang 002” deposited in CMMI (Institute of Chinese Materia Medica, Beijing) and IBK (Guangxi Institute of Botany), respectively, which would make the name invalid. However, all other information for these specimens is identical, so we prefer to regard the specimens as holotype and isotype and the name, therefore, as valid.