Elatostema subtrichotomum W. T. Wang

Herbs perennial, monoecious or dioecious, ca. 50 cm tall. Stems ascending or erect, simple or branched, glabrous. Leaves alternate, glabrous; nanophylls absent; stipules linear, 3-4 × 0.8-1 mm; petiole 2-14 mm; leaf blade obliquely oblong, 12-17 × 3.5-5 cm, herbaceous or nearly papery, major basal lateral veins ± absent and venation pinnate, cystoliths conspicuous, dense; base with broader half cuneate or nearly rounded, margin denticulate, apex acuminate. Male inflorescences in pairs, branched, ca. 10 mm in diam.; peduncle 2-3 mm; receptacle absent; bracts alternate, narrowly ovate or narrowly triangular, 0.8-1.2 mm. Female inflorescences in pairs, ca. 2 mm in diam., sessile; receptacle ca. 1.2 mm in diam.; bracts narrowly triangular; bracteoles lanceolate-linear. Male flowers 5-merous; perianth lobes with apex corniculate or not. Fl. Apr.

N Guangdong, C Hunan, SE Yunnan.

* Valley forests, streamsides, rock crevices; 1700-1900 m.

Elatostema subtrichotomum var. corniculatum W. T. Wang.

Elatostema subtrichotomum là loài thực vật có hoa trong họ Tầm ma. Loài này được W.T.Wang mô tả khoa học đầu tiên năm 1980.

歧序楼梯草（学名：Elatostema subtrichotomum）是荨麻科楼梯草属的植物，是中国的特有植物。分布于中国大陆的湖南、广东等地，生长于海拔800米至1,700米的地区，多生在山谷溪边林中或石上，目前尚未由人工引种栽培。