UW Burke Herbarium species comparison

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

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.

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.