Acronema tenerum (DC.) Edgew.

Despite this species being the most widespread in the genus, fruiting material is still lacking for many areas (including China). This species is similar and closely related to Acronema hookeri, with which larger specimens of A. tenerum can be confused. The presence of bracteoles and shorter petal apices are useful in recognizing such specimens of A. tenerum.

Plants 5–30 cm. Rhizome narrowly conic, or elongate-globose, ca. 5 mm across. Stem solitary, slender. Basal leaves petiolate, petioles 2–5 cm, sheaths narrowly lanceolate; blade triangular, 1.5–2.5 × 1.5–3 cm, 2–3-ternate-pinnate; ultimate segments cuneate-obovate or obovate, ca. 5 × 5 mm, apex often 3-toothed. Umbels 2–3 cm across; peduncles 2–5 cm, slender; bracts usually absent; rays 3–4, 1–2 cm, unequal; bracteoles 1–3, 2–3 mm; umbellules 6–14 mm across, 3–5-flowered; pedicels 2–7 mm, unequal. Calyx teeth obsolete. Petals purple-red, ovate, ca. 2 mm; apex linear, ca. 1 mm. Fruit broad-ovoid, ca. 1–1.5 × 1–1.5 mm; vittae minute, 2 in each furrow, 2 on commissure. Fl. Aug.

Himalaya (Kumaun to Bhutan), N. Burma, Yunnan.

E Xizang, NW Yunnan [Bhutan, NE India, E Nepal, Sikkim, N Thailand].

2800-4000 m

Damp shady crevices; 3400–3500 m.

Acronema tenerum là một loài thực vật có hoa trong họ Hoa tán. Loài này được (DC.) Edgew. mô tả khoa học đầu tiên năm 1851.

丝瓣芹（学名：Acronema tenerum）是伞形科丝瓣芹属的植物。分布于锡金、印度以及中国大陆的西藏、云南等地，生长于海拔3,500米的地区，多生在岩石边或阴湿岩隙中，目前尚未由人工引种栽培。