叉枝西风芹 cha zhi xi feng qin

Plants 30–60(–70) cm, monocarpic. Caudex simple. Stem solitary, dichotomously branched nearly from base, finely grooved, lower parts minutely puberulent, branches elongate. Basal leaves several, petioles short; blade oblong, 5–10 × 2.5–3 cm, 2–3-pinnatisect; pinnae 4 pairs, remote; ultimate segments narrowly linear, 5–12 × 0.5–1 mm, glabrous, margins entire and revolute. Synflorescence corymbose; umbels 3–10 cm across; bracts absent; rays 6–13, 1–70 mm, very unequal; bracteoles 10–12, linear-lanceolate, about equaling flowers, bases connate, densely white pubescent, margins scarious; umbellules 20–25-flowered, capitate; pedicels very short, 1–2 mm, pubescent. Petals yellowish, abaxially white puberulous. Stylopodium low-conic; styles reflexed. Fruit ovoid or oblong-ovoid, slightly dorsally compressed, 2.2–4 × 0.8–1.5 mm, densely puberulent; ribs prominent, equal, obtuse-keeled; vittae 1 in each furrow, 2 on commissure. Fl. Jul–Aug, fr. Aug–Sep.

Stony mountain slopes, semi-deserts, conglomerate terraces, clayey soils; 1500–2300 m. Xinjiang (Bogda Shan, Zhaosu) [Kazakhstan, Kyrgyzstan].