Brongniartia argentea Rydb.

Brongniartia argentea Rydberg, sp. nov
A shrub; young branches densely white-viilous, almost tomentose; leaves 5-8 cm. long; petiole 0.5-1.5 cm. long, as well as the rachis white-tomentose; stipules ovate, 5-8 mm. long; leaflets 13-17, elliptic, about 1.5 cm. long, silvery on both sides, white beneath; petiolules very short; flowers mostly solitary in the axils; pedicels 1 cm. long or less; bractlets ovate, 4-6 mm. long, white-silky; calyx 15 mm. long, silky, the lobes narrowly lanceolate, attenuate, the lowest slightly longer; corolla about 2 cm. long, rose-purple; petals all broad, the banner orbicular.
Type collected in the district of Miahuatlan, Oaxaca, May 17, 1917, Conzalti &■ Reko 3Z80 (U. S. Nat. Herb. no. 763898).