Oreocomopsis xizangensis Pimenov & Kljuykov

This rather poorly known taxon is recorded from only a few collections. One of us (Pu) has examined no specimens. The species is closely allied to Oreocomopsis stelliphora (Cauwet & Farille) Pimenov & Kljuykov, from Nepal, in having bracts foliaceous and bracteoles 2–3 × as long as umbellules, but it differs most noticeably in having pilose rays, bracts, and bracteoles; rays 12–26 (vs. 6–8); and calyx teeth absent (vs. evident).

Plants 25–30 cm, roots cylindric. Stem erect, 4–5 mm thick, often violet at base. Basal leaves petiolate, petioles 8–10 cm, glabrous; blade rhomboid in outline, 6–12 × 6–12 cm, 3–4-pinnate, primary pinnae petiolate, but distal sessile; ultimate segments rhomboid or ovate ca. 6–10 mm, margin pinnate, dentate or lobed on each side. Upper leaves few (1–2), similar to basal, but reduced. Umbels 6–10 cm across; bracts 6–10, ca. equaling rays, 1–2-pinnate, pilose; rays 12–26, unequal, 4–9 cm, pilose; bracteoles numerous, filiform, entire or 2-lobed, 2–3 × umbellules, reflexed, pilose. Petals deep violet, 1.2–2.3 mm. Fruit 6–6.5 × 3.5–4 mm. Fr. Sep.

S Xizang (Nyalam, Rinbung).

Rhododendron forests, valleys; 5100–5300 m.