Pternopetalum delavayi (Franch.) Hand.-Mazz.

This species has reputed medicinal value.

Plants (15–)30–60(–150) cm. Stems erect, sparsely pubescent, 3–5(–7)-branched. Basal and lower leaves petiolate, petioles 4–15 cm, glabrous; blade triangular-ovate, 3–7 × 2.5–6 cm, 2-ternate; ultimate segments rhomboidal or flabelliform, 1–5 × 2–3 cm, veins and margins pubescent. Upper leaves 1–2-ternate; ultimate segments elongate-linear, 4–10 × 0.3–0.8 cm. Inflorescence branching, umbels 2–4 cm across in flower, to 8 cm in fruit, terminal on stem and branches; bracts absent; rays (4–) 13–18(–25), 0.5–5 cm; bracteoles 2–4, 0.5–1.2 mm; umbellules (2–)3–4-flowered; pedicels 0.2–2.5 mm. Calyx teeth subulate, ca. 0.3 mm. Petals white, sometimes tinged pink, ca. 1.1 × 0.8 mm. Stylopodium conic; styles elongate; stylopodium and style ca. 0.9 mm. Fruit oblong-ovoid, 2–4 × 1.2–2 mm, sometimes 1 mericarp aborted in fruit; ribs filiform; vittae 1–3 in each furrow, 4 on commissure. Fl. Jun–Jul, fr. Aug–Sep.

W Sichuan, E Xizang, NW Yunnan.

Forests, forest margins, alpine scrub and meadows; 2300–4500 m.

Flowering from June to July; fruiting from August to September.

Pternopetalum delavayi is close relative of Pternopetalum cardiocarpum, but differs from the latter in its white (vs. purplish) petals, elongate (vs. as long as the stylopodium) styles, oblong-ovode (vs. ovoid) fruit.

Pternopetalum delavayi is occurring in W Sichuan, E Xizang, NW Yunnan of China.

Phenetic analysis was conducted for the taxa of Pternopetalum Franchet by using UPGMA algorithm implemented in DELTA packages, based on morphological characters (Wang, 2007). The results shown that the Pternopetalum was divided into two distinct phenetic groups, corresponding to sections Denterioideae H. Wolff and Pteridophyllae H. Wolff (Shan and Pu, 1978).

Plants 30-120 cm. Stems erect, sparsely pubescent, 3-7-branched. Basal and lower leaves petiolate, petioles 4-15 cm, glabrous; blade triangular-ovate, 3-7 cm long, 2.5-6 cm wide, 2-ternate; ultimate segments rhomboidal or flabelliform, 1-5 cm long, 2-3 cm wide, veins and margins pubescent. Upper leaves 1-2-ternate; ultimate segments elongate-linear, 4-10 cm long, 0.3-0.8 cm wide. Inflorescence branching, umbels 2-4 cm across in flower, to 8 cm in fruit, terminal on stem and branches; bracts absent; rays 13-18, 0.5-5 cm; bracteoles 2-4, 0.5-1.2 mm; umbellules 3-4-flowered; pedicels 0.2-2.5 mm. Calyx teeth subulate, ca. 0.3 mm. Petals white, sometimes tinged pink, ca. 1.1 mm long, ca. 0.8 mm wide. Stylopodium conic; styles elongate; stylopodium and style ca. 0.9 mm. Fruit oblong-ovoid, 2-4 mm long, 1.2-2 mm wide, sometimes 1 mericarp aborted in fruit; ribs filiform; vittae 1-3 in each furrow, 4 on commissure.

Growing in forests, forest margins, alpine scrub and meadow; 2300-4500 m.

Pternopetalum delavayi is used medicinally.

Pternopetalum delavayi là một loài thực vật có hoa trong họ Hoa tán. Loài này được (Franch.) Hand.-Mazz. miêu tả khoa học đầu tiên năm 1933.

澜沧囊瓣芹（学名：Pternopetalum delavayi）为伞形科囊瓣芹属的植物，是中国的特有植物。分布在中国大陆的四川、云南、西藏等地，生长于海拔2,300米至3,600米的地区，多生长于草坡、河边、山涧、灌丛以及林下，目前尚未由人工引种栽培。