Tongoloa tenuifolia H. Wolff

This incompletely known species is recorded only from a few collections.

Plants ca. 50 cm. Stem little-branched. Basal leaves few; petiole sheaths oblong; blade broadly triangular or rhombic-triangular, 3–4-pinnate; primary and secondary pinnae petiolulate; ultimate segments linear, 3–5 × 0.5–1 mm. Umbels to 15 cm across; peduncles 8–25 cm; bracts and bracteoles absent; rays thick, 6–11, 4–9 cm, spreading-ascending; umbellules many-flowered, ca. 1.5 cm across; pedicels slender. Calyx teeth minute, ovate. Petals obovate, white, rarely pinkish, apex obtuse-acute. Anthers yellow or tinged with purplish. Young fruit broad-ovoid, 2–2.5 × ca. 2 mm (mature fruit unknown). Fl. Aug.

Sichuan, Xizang, Yunnan.

Damp slopes, marshy areas; 3500–4300 m.