Rhodosciadium macrophyllum Mathias & Constance

Rhodosciadium macrophyllum Math. & Const. Bull Torrey Club 68: 124. 1941.
Deanea glauca Coult. & Rose, Proc. Wash. Acad. 1: 156. 1900. Not Rhodosciadium glaucum Coult. & Rose, 1895.
Stout, 9-12 dm. high, very glaucous, the inflorescence scaberulous; leaves ovate-deltoid in general outline, excluding the petioles 30-60 cm. long, ternate-pinnate, the leaflets oblonglanceolate, acuminate at the apex, sessile and confluent by a broad, toothed rachis-wing, 18-24 cm. long, S— 10 cm. broad, crenate-serrate and incised toward the base, very glaucous beneath; petioles stout, 25 cm. or more long; upper cauline leaves lanceolate, ternate or simple, with obsolete sheaths and elongate acuminate lobes; inflorescence compound-umbellate, irregularly branched, leafy, usually some umbels sessile, the peduncles slender, 2-5 cm. long, each subtended by a foliaceous bract; involucre of several filiform or foliaceous bracts 10-15 mm. long; involucel of several filiform bractlets 2-4 mm. long, exceeding the flowers but shorter than the fruit; rays 4-8, divaricate, subequal, 1-2.5 cm. long, scaberulous; pedicels 1-4, divaricate, 2-5 mm. long, scaberulous; petals apparently purple; immature fruit ovoid, acute at the apex, cordate at the base, 7-9 mm. long, 4-5 mm. broad, glaucous, the dorsal ribs apparently filiform, the lateral wings broader than the body.
Type locality: "Foothills between Aguacata and Dolores," Nayarit, Rose 2029. Distribution: Sinaloa to Nayarit (Rose 1781).