Rhodosciadium pringlei S. Wats.

Rhodosciadium pringlei S. Wats. Proc. Am. Acad. 25: 151. 1890
Rather slender, from a simple or branched short tuberous rootstock, 8-12 dm. high, glaucous throughout, the foliage puberulent; leaves deltoid in general outline, excluding the petioles 10-30 cm. long, ternate-pinnate, the leaflets ovate, acute at the apex, cuneate at the base, confluent, sessile to petiolulate, 2.5-5 cm. long, 1-2.5 cm. broad, deeply incised to pinnatifid, puberulent on the veins above and sometimes beneath; petioles slender, 7-20 cm. long; upper cauline leaves lanceolate; inflorescence widely branched, the peduncles slender, 2-7 cm. long; involucre of 1 or 2 minute, linear bracts; involucel similar to the involucre; rays 1-5, slender, spreading, subequal, 0.5-1.5 cm. long; pedicels 1 or 2, spreading, about 1 mm. long; petals purple; fruit oval, cordate at apex and base, 6-10 mm. long, 4-8 mm. broad, the dorsal ribs filiform, the lateral wings equaling the body; seed-face slightly concave.
Type locality: "Hillsides near Guadalajara," Jalisco, Pringle 2981.
Distribution: Jalisco to Michoac&n (Arsene 2S76, Pringle 3869, Rose & 1 Painter 7675).