Description from Flora of China
Carum cardiocarpum Franchet, Bull. Soc. Philom. Paris, sér. 8, 6: 120. 1894; Cryptotaeniopsis cardiocarpa (Franchet) Dunn
Plants (8–)20–40(–90) cm. Stem single, 3–5-branched. Basal and lower leaves petiolate, petioles 4–12 cm; blade triangular-ovate, 3–6 × 2.5–6 cm, 1–2-ternate; ultimate segments flabelliform or rhomboidal, ca. 1 × 1 cm, veins and margins pubescent. Upper leaves several, 1–2-ternate; ultimate segments elongate-linear, 10–25 × ca. 2 mm. Inflorescence branching, umbels 1.5–2.5 cm across in flower, to 5 cm in fruit, terminal on stem and branches; bracts absent; rays 5–25, 1.5–3 cm; bracteoles 1–3, ca. 0.5 mm; umbellules 2–4-flowered; pedicels 0.1–2 mm. Calyx teeth subulate, size ca. 0.4 mm. Petals purple-white. Stylopodium low-conic; styles ca. 0.5 mm, as long as stylopodium, reflexed. Fruit ovoid, 2–3 × 1.5–2 mm; ribs filiform; vittae 1–3 in each furrow, 4 on commissure. Fl. Jun–Jul, fr. Aug–Sep.
This plant may be conspecific with the E Himalayan Pternopetalum radiatum (W. W. Smith) P. K. Mukherjee & Constance (Acronema radiatum (W. W. Smith) H. Wolff; Pimpinella radiata W. W. Smith), but further work and collections from NE India and N Myanmar are needed to confirm this.
Coniferous forests, forest margins, scrub, alpine meadows; 2700–4300 m. W Sichuan, E Xizang, NW Yunnan.