Prionosciadium dissectum Coult. & Rose

Prionosciadium dissectum Coult. & Rose, Proc. Wash Acad. 1: 151. 1900.
Plants stout, 1-2 m. high, glabrous and more or less glaucous throughout; basal leaves
ovate in general outline, excluding the petioles 3-3.5 dm. long, ternate to bipinnate, the leaflets
ovate-lanceolate, acuminate at the apex, truncate to cuneate at the base, 3.5-9 cm. long, 1.5-6
cm. broad, distinct, petiolulate, again 1-2-pinnatifid, the lobes lanceolate, remotely serrate,
the rachis unwinged; upper cauline leaves opposite or solitary, bipinnatifid with conspicuous
orbicular purplish sheaths; inflorescence of several verticils of peduncles, or these occasionally
alternate; peduncles slender, 4.5-10 cm. long; involucre of 1-several filiform bracts 5-10 mm.
long, or wanting; involucel of several filiform bractlets 3-6 mm. long, about equaling the
flowers but shorter than the fruit; fertile rays 15-25, spreading, subequal, 2-3.5 cm. long;
fertile pedicels 2-5, 2-3 mm. long; calyx-teeth obsolete; flowers purple, the ovary glabrous;
fruit oblong, rounded at the apex, retuse at the base, 9-1 1 mm. long, 5-6 mm. broad, glabrous,
the dorsal ribs prominent, the lateral broadly thinwinged, the wings about as broad as the body;
oil-tubes 1 or 2 in the intervals, 4-6 on the commissure; seed unchanneled under the intervals,
the face involute.
Type locality: "Between San Cristobal and Guadalajara," Jalisco, Pringle 3002. Distribution: Jalisco (Pringle 8641, Rose 3060).