Tauschia filiformis (J. M. Coult. & Rose) J. M. Coult. & Rose

Tauschia filiformis Coult. & Rose, Proc. Wash Acad. 1:137. 1900.
Arracacia filiformis Coult. & Rose, Contr. U. S. Nat. Herb. 3: 296. 1895 (nomen subnudum) ; Coult. & Rose in Hook. Ic. pi. 2429. 1896.
Slender, caulescent, erect from a stout taproot, 1-2 dm. high, glabrous throughout; leaves ovate-deltoid in general outline, excluding the petioles 3-7 cm. long, ternate-pinnately decompound, the ultimate divisions linear to filiform, 5-25 mm. long, entire or few-toothed; petioles 5-12 cm. long; peduncles slender, 7-15 cm. long; involucre wanting; involucel of several linearspatulate, entire or trifid bractlets, 1-2 cm. long, exceeding the flowers and fruit; fertile rays 4-8, slender, very unequal, 20-80 mm. long; pedicels 2-5 mm. long; calyx-teeth minute; flowers white or purplish; styles short, reflexed; carpophore 2-cleft to the base, the halves divergent for their apical third, forming a Y; fruit oblong-oval, truncate, 3-4 mm. long, 2-3 mm. broad, with a V-shaped depression at the commissure, the ribs low and obtuse, about equaling the intervals; oil-tubes rather large, flattened, solitary in the intervals, 2 on the commissure; seed-face concave to slightly sulcate.
Type locality: Cerro de San Felipe, Oaxaca, Pr ingle 47 14. Distribution: High mountains of Oaxaca (Nelson 621, 108S).