Prionosciadium cuneatum Coult. & Rose

Prionosciadium cuneatum Coult. & Rose, Proc Wash. Acad. 1 : 149. 1900.
Plants stout, 1.5-3 m. high, glaucous, hispidulous throughout; basal leaves deltoid in general outline, excluding the petioles 1.5-3.5 dm. long, ternate to bipinnate, the leaflets oblong or oblanceolate, obtuse or abruptly acute at the apex, tapering or blunt at the base, 3-7 cm. long, 1-4 cm. broad, crenate to crenate-serrate, confluent by the broad winged rachis, which is crenate-dentate at the summit but rapidly tapering and entire below, the main rachis winged at least above; petioles unwinged or only slightly winged at the summit; cauline leaves opposite, the uppermost simple, linear, bractlike; inflorescence a whorl of branches bearing opposite peduncles below and whorled ones terminally; peduncles rather stout, 3-6 cm. long; involucre wanting; involucel of several filiform bractlets 3-4 mm. long, shorter than the flowers and fruit; fertile rays 8-15, spreading, subequal, 1-2 cm. long; fertile pedicels 1-3, 2-4 mm. long; calyxteeth evident but minute, triangular; flowers purple, the ovary glabrous; fruit oblong, rounded at the apex, or retuse at both apex and base, 7-1 5 mm. long, 5-8 mm. broad, glabrous, the dorsal ribs narrowly winged, the lateral broadly winged, the wings about equaling the body; oil-tubes 1 or 2 in the intervals, about 5 on the commissure; seed scarcely channeled under the intervals, the face involute.
Type locality: "On grassy slope of barranca near Guadalajara," Jalisco, Pringle 3868. Distribution: Jalisco (Pringle 8636, Rose & Hough 4822).