UW Burke Herbarium species comparison

Leaves ternate-pinnately dissected into linear or filiform segments 3-10 mm. long and up to 1 mm. wide.

Leaves cauline and basal, irregularly pinnately dissected into unequal narrow segments up to 1 cm. long. Taproot short, tuberous-thickened or with 2 or more globose-thickened portions.

Inflorescence a compound umbel, the rays unequal, 4-13 mm. long; with usually only 2-5 fertile flowers;

involucre wanting;

bractlets of the involucel ternately or bi-ternately divided;

calyx teeth obsolete, flowers yellow.

Inflorescence of compound umbels, the rays 3-7 cm. long at maturity;

involucre none;

involucel of inconspicuous, narrow bractlets;

calyx teeth obsolete, flowers yellow;

pedicels 4-10 mm. long.

Fruit glabrous, 8-13 mm. long and 5-7 mm. wide, the corky-thickened lateral wings half as wide as and the same color as the body.

Fruit glabrous, elliptic, 5-8 mm. long, the lateral wings well-developed, but barely as wide as the body.