Rhodosciadium longipes (Rose) Mathias & Constance

Rhodosciadium longipes (Rose) Math. & Const Bull. Torrey Club 68: 124. 1941.
Deanea longipes Rose, Contr. U. S. Nat. Herb. 10: 128. 1906.
Stout, 8-18 dm. high, glabrous throughout or the foliage occasionally scaberulous; leaves deltoid in general outline, excluding the petioles 30-40 cm. long, ternate-bipinnate, the leaflets ovate to lanceolate, acuminate at the apex, truncate to cuneate at the base, the terminal confluent, petiolulate to sessile, 3-6 cm. long, 1.5-3.5 cm. broad, sharply serrate and incised or lobed toward the base, glabrous or minutely scaberulous on the veins beneath; petioles stout, 60-80 cm. long, somewhat inflated; inflorescence usually 1-2-trifurcate, the peduncles slender, 4-16 cm. long, but the terminal umbel usually sessile; involucre of 1-3 foliaceous bracts, or wanting; involucel of several linear bractlets 2-4 mm. long, shorter than the flowers and fruit; rays 3-6, spreading-ascending, subequal, 5-10 cm. long; pedicels 1-4, spreading-ascending, 10-15 mm. long; petals greenish-yellow; fruit oval to slightly obcordate, rounded at the apex, cordate at the base, S-l 1 mm. long, 7-8 mm. broad, the dorsal ribs prominent, the lateral wings equaling or a little broader than the body ; seed-face slightly concave.
Type locality: "At Trinidad, Puebla," Pringle 13,496 (apparently an error for "Trinidad Iron Works, Hidalgo").
Distribution: Hidalgo (Pringle 10,297).