Slender glabrous perennial herb, 55–70 cm., with a swollen tuberous root ± 2.5 cm. in diameter.. Stem slender, terete, sparingly to moderately branched in the inflorescence; upper flowering branches alternate, opposite or sometimes verticillate.. Leaves principally basal, the lamina finely denticulate, usually narrowly lanceolate-elliptic or oblong, 6–11 × 1–3 cm., rarely almost round, 4–7 × 3–6.5 cm., with the principal veins originating from the base or a little above, usually gradually but rarely abruptly narrowed into a distinct or obscure petiole 1.5–15 cm. long; cauline leaves below the inflorescence 1–2, very narrow, denticulate or rarely pinnate with short narrow segments, sheaths long; inflorescence leaves much reduced, trisect or pinnate with short, very narrow segments.. Umbels of (2–)4–7 slender rays 1.5–2.5 cm. long; involucre absent; partial umbels 4–8(–10)-flowered; pedicels 2–7 mm. long; involucel absent; peduncles slender, 1.5–6 cm.. Calyx absent.. Petals white, broadly obcordate, 1.5 mm., distincdy emarginate, glabrous.. Ovary glabrous.. Fruit shortly ellipsoid to subglobose, 2–2.5 mm., blackish when ripe with green ribs, glabrous; stylopodia shortly conical, the disk with an undulate margin; styles short and rather thick, divergent or deflexed, scarcely exceeding the width of the disk.. Fig. 21.
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