Seseli tachiroei Franchet & Savatier, Enum. Pl. Jap. 2: 373. 1878; Cnidium filisectum Nakai & Kitagawa; C. tachiroei (Franchet & Savatier) Makino; Ligusticum filisectum (Nakai & Kitagawa) M. Hiroe; L. koreanum H. Wolff; L. tachiroei var. filisectum (Nakai & Kitagawa) S. Y. He & W. T. Fan; Rupiphila tachiroei (Franchet & Savatier) Pimenov & Lavrova; Tilingia filisecta (Nakai & Kitagawa) Nakai & Kitagawa; T. tachiroei (Franchet & Savatier) Kitagawa.

Plants 10–30 cm tall, slender, glabrous. Root cylindrical. Stem single or multicipital, little-branched or unbranched. Basal petioles 5–7(–12) cm; blade ovate, 5–10 × 5–7 cm, 3-pinnate, primary pinnae 5–7 pairs; ultimate segments linear, 3–15 × 0.5–1 mm. Cauline leaves similar to basal, reduced. Umbels terminal and lateral, 2–4 cm across; bracts 2–7, lanceolate, margins white membranous, usually caducous; rays 5–10, unequal, 5–15(–40) mm; bracteoles 5–8, similar to bracts, ca. equaling pedicels. Calyx teeth conspicuous, lanceolate, ca. 0.5 mm. Petals white or pinkish, base shortly clawed. Styles ca. 2 × stylopodium. Fruit oblong, 3–4 × 1–2 mm; ribs prominent, subequal; vittae 1 in each furrow, 2 on commissure. Seed face plane to slightly concave. Fl. Jul–Aug, fr. Aug–Sep.

Pebbly slopes, damp river banks, rock crevices; 1200–2500 m. Hebei, Henan, Jilin, Liaoning, Shanxi [Japan, Korea, Mongolia].