青海柴胡 qing hai chai hu

Plants 30–80 cm, perennial. Root yellowish-brown, woody, slender. Stem erect, green, base without fibrous remnant sheaths. Basal leaves linear, 10–14 × 0.3–0.5 cm, 5-nerved, papery, base tapering into petiole. Cauline leaves linear, 8–10 × 0.4–0.5 cm, 5-nerved, petiolate, clasping. Apical leaves short-linear. Umbels 2–3.5 cm across; bracts 3–4, oblong, 2–7 × 1–2 mm, 5-nerved; rays 6–13, 4–33 mm, unequal; bracteoles 5–7, obovate, 3–4 × 1–2 mm, green, 3-nerved, thickly papery, exceeding the flowers; umbellules 5–8 mm across, 5–26-flowered; pedicels 1–2 mm, very slender. Petals yellow. Stylopodium low-conic, yellow. Fruit oblong, brown, 2–3 × ca. 1.5 mm; ribs prominent; vittae 3 in each furrow, 4 on commissure. Fl. and fr. Jun–Aug.

Sunny slopes, grassy places; 3200–3700 m. Qinghai (Wanglin).

This rather poorly known taxon is recorded only from a few collections.