S. Pecten: annual; stem branching, erect, or spreading, 1/2-1 foot high, hairy; leaves twice or thrice pinnate, with short segments cut into linear lobes; umbels terminal of 2-3 rays, without general involucres; partial involucres of several lanceolate bracts, often 2-3 lobed at the top; flowers small and white, with a few large outer petals; carpels cylindrical and ribbed, terminated in a stiff, flattened beak three times their length, sometimes compared to the tooth of a comb. - Venus's Comb. - A cornfield weed. Fl. June to August.