Rhodosciadium glaucum Coult. & J. N. Rose

Rhodosciadium glaucum Coult. & Rose, Contr. U. S. Nat
Herb. 3:309. 1895.
Slender, from a short tuberous, often forked rootstock, 8-1 5 dm. high, glaucous throughout, the foliage scaberulous; leaves ovate-deltoid in general outline, excluding the petioles 5-25 cm. long, biternate or ternate-pinnate, the leaflets lanceolate to ovate-lanceolate, acute or acuminate at the apex, cuneate at the base, distinct, sessile, 2-9 cm. long, 0.5-2 cm. broad, crenate-serrate to slightly incised, scaberulous on the veins above and sometimes beneath; petioles slender, 5-35 cm. long; upper cauline leaves oblong; inflorescence widely branched, the peduncles slender, 2-8 cm. long, frequently some umbels sessile and proliferating; involucre wanting, or of 1 or 2 minute bracts; involucel similar to the involucre; rays 3-7, slender, spreading, subequal, 1-3 cm. long; pedicels 1-4, spreading, 2-3 mm. long; petals greenish-yellow; fruit oval, cordate at apex and base, 6-10 mm. long, 5-8 mm. broad, the dorsal ribs filiform, the lateral wings broader than the body; seedface slightly concave to sulcate.
Type locality: "On foothills above Oaxaca," Oaxaca, Pringle 5539.
Distribution: Morelos and Oaxaca, south to Guatemala {Galeotli 27S4, Pringle 4S23).