Rhodosciadium tolucense (Kunth) Mathias

Rhodosciadium tolucense (H.B.K.) Mathias, Brittonia 2: 245. 1936.
Ferula tolucensis H.B.K. Nov. Gen. & Sp. 5: 12. 1821.
Pastinaca tolucensis Spreng. Syst. 1: 913. 1825.
Peucedanum tolucense Hemsl. Biol. Centr. Am. Bot. 1: 570. 1881.
Deanea longibracteata Coult. & Rose, Proc. Wash. Acad. 1: 154. 1900.
Deanea tolucensis Rose, Contr. U. S. Nat. Herb. 10: 128. 1906.
Rather stout, from a vertical or oblique fusiform taproot, 3-12 dm. high, glabrous throughout or the inflorescence scaberulous; leaves ovate-lanceolate in general outline, excluding the petioles 10-35 cm. long, 5-15 cm. broad, bipinnate, the leaflets ovate, acute to obtuse at the apex, cuneate at the base, the lower distinct, sessile, 2-6 cm. long, 1-3 cm. broad, pinnatifid; petioles stout, 5-25 cm. long; inflorescence of a solitary umbel or accompanied by 2 or 3 axillary umbels, the peduncles stout, 10-40 cm. long, or some umbels occasionally sessile; involucre of a solitary foliaceous bract 3-13 mm. long, or frequently wanting; involucel of several spatulatelinear to filiform bractlets 5-35 mm. long, exceeding the flowers and fruit; rays 10-20, slender, spreading-ascending, very unequal, 3-11 cm. long; pedicels 1-6, spreading-ascending, 3-8 mm. long, sometimes scaberulous; petals greenish-yellow or purplish; fruit oval to orbicular, cordate at apex and base, 6-9 mm. long, 6-8 mm. broad, the dorsal ribs prominent, the lateral wings equaling the body; seedface slightly concave.
Type locality: "Crescit in frigidis juxta urbetn Toluca, alt. 1380 hex. (Nova Hispania)," Humboldt &* Bonpland.
Distribution: Jalisco and Vera Cruz, south to Mexico and Puebla (Pringle 4233, Pur pus 1680, Rose &= Hay 5717).