Description from Flora of China
Homopteryx Kitagawa; Physolophium Turczaninow.
Herbs, perennial. Stem hollow. Leaves 2–3-pinnate or 2–3-ternate-pinnate, sheaths inflated. Umbels compound, terminal or lateral. Calyx teeth obsolete. Petals white, long-elliptic, apex inflexed. Stylopodium short-conic, margin often sinuolate. Fruit ellipsoid or ovoid-ellipsoid, slightly flattened dorsally, glabrous; ribs all broad, thickly winged, lateral ribs slightly broader than the dorsal or nearly equal; vittae 1–3 in each furrow, 2–4 on commissure. Seed face plane or concave. Carpophore 2-cleft to base.
This genus differs from Angelica and other related genera in its nearly equally winged fruit and chromosome number n = 14; see also the taxonomic comment under Angelica.
About four species: E Asia, North America; two species in China.
(Authors: Pan Zehui (潘泽惠); Mark F. Watson)