Changium smyrnioides is a species of flowering plant in the Apiaceae, of the monotypic genus Changium. It is plants 50–100 cm. Taproot surface tawny to pale yellow, inner parts white, starchy. Branches remote and spreading, often alternate, branchlets alternate or opposite. Petiole 3–15 cm; blade 4–10 × 2–5 cm; pinnae broadly ovate, pinnatifid; ultimate segments oblong-lanceolate, 2–4 × 1–2 mm. Leaves reduced upwards, the uppermost reduced to linear or bladeless sheaths. Umbels 3–8 cm across; bracts absent or 1–3, small, ca. 1 cm; rays 4–10, 2.5–10 cm, spreading; bracteoles few, linear, 4–6 mm; umbellules 8–20-flowered. Petals pale purplish when young becoming white. Ten compounds were isolated and identified as lignoceric acid (1), beta-sitosterol (2), stigmasterol (3), 5-hydroxy-8-methoxypsoralen (4), glycerylmonopalmitate (5), L-pyroglutamic acid (6), succinic acid (7), vanillic acid-4-O-beta-D-glucopyranoside (8 ), vanillic acid (9), daucosterol (10).