Coaxana purpurea Coult. & Rose

Coaxana purpurea Coult. & Rose, Contr. U. S. Nat Herb. 3:297. 1895. Plants 3-18 dm. high, often more or less purplish throughout; leaves ovate in general outline, excluding the petioles 1-3 dm. long, 3-ternate or bipinnate, the leaflets sharply doubly serrate with spinulose teeth and somewhat incised, paler and reticulate beneath; petioles slender, 1-3 dm. long; cauline leaves reduced upward, with conspicuously inflated sheaths; peduncles 5-20 cm. long; involucre of a leaflike bract 3-4 cm. long, or wanting; involucel of several oblanceolate, toothed bractlets, 10-25 mm. long; rays 8-20, subequal to unequal, 3-5 cm. long; fertile pedicels 5 mm. long; fruit oblong-oval, 4-7 mm. long, 2-4 mm. broad.
Type locality: On southwest side of summit of Mount Zempoaltepec, Oaxaca, 10,000-11,000 feet, Nelson 646.
Distribution: Oaxaca to Guatemala {Steyermark 34,691, 35,741).