拉萨厚棱芹 la sa hou leng qin

Plants acaulescent, 10–20 cm. Taproot rather thick. Leaves petiolate, petioles 2–3 cm, sheaths inflated at base; blade oblong-lanceolate, 3–6 × 1–2 cm, 2–3-pinnate, pinnae 4–7 pairs, remote; ultimate segments ovate-lanceolate, 2–3 × ca. 1 mm. Umbels 8–10 cm across, sessile; rays 11–14, extremely unequal, 4–20 cm; bracteoles 6–8, 1–2-pinnate. Calyx teeth linear, several times longer than stylopodium. Petals white, oblong-ovate. Stylopodium conic; styles elongate, ca. 2 mm. Fruit ovoid, 3–4 × ca. 2 mm; all ribs evenly spaced; vittae 1 in each furrow, vittae absent on commissure. Fl. and fr. Jul–Sep.

Alpine meadows; 4300–4600 m. W Sichuan, S Xizang.