Rhodosciadium montanum (Coult. & Rose) Mathias & Constance

Rhodosciadium montanum (Coult. & Rose) Math. & Const
Bull. Torrey Club 68: 124. 1941.
Deanea monlana Coult. & Rose, Proc. Wash. Acad. 1: 155. 1900.
Rather stout, about 10 dm. high, glabrous and somewhat glaucous throughout; leaves deltoid in general outline, excluding the petioles 15-20 cm. long, 1-2-ternate-pinnate, the leaflets ovate, acute at the apex, euneate at the base, distinct and rather remote, sessile, 1.5-3 cm. long, 1-2 cm. broad, serrate and somewhat incised and lobed; petioles stout, 10-20 cm. long; uppermost cauline leaves ternate, the middle lobe elongate; inflorescence trifurcate, the peduncles rather slender, 8-20 cm. long, the terminal umbel often sessile; involucre of 1 or 2 filiform bracts 10-15 mm. long; involucel of several filiform bractlets 3-6 mm. long, shorter than the fruit; rays 6-10, spreading-ascending, unequal, 2-6 cm. long; pedicels 1-4, spreading-ascending, 2-4 mm. long; petals not seen; fruit oval, rounded at apex and base, 7-8 mm. long, 5 mm. broad, the dorsal ribs prominent, the lateral wings a little narrower than the body; seed-face slightly concave.
Type locality: "On the Sierra de los Morones near Plateado," Zacatecas, Rose 3623. Distribution: Zacatecas to Durango (Nelson 4548).