Polygala gracillima S. Wats.

Polygala gracillima S. Wats. Proc. Am Acad. 22: 398. 1887.
Very slender erect glabrous annual, 9-21 cm. high; leaves in 1 or 2 whorls of 3 below, obovate, 3-3.5 mm. long, the others scattered, linear, cuspidate, 2-7 mm. long, 0.3-0.6 mm. wide; racemes very slenderly conic-cylindric, dense, 6-28 mm. long, 2-2.6 mm. thick; pedicels 0.2 mm. long; bracts persistent, lance-subulate, 0.8 mm. long; flowers white or rosy; sepals ovate to oval, 0.6 mm. long; wings oblong-oval, 1.3 mm. long, 0.7 mm. wide, rounded; keel 1-1.1 mm. long, the crest of 2 lobes on each side; capsule suborbicular, 1.1 mm. long; seed black, glabrous, ellipsoid-fusiform, striate, 0.5 mm. long; aril extremely minute; stamens 6.
Type locality: Rio Blanco, Jalisco.
Distribution: Sinaloa to Morelos and Michoacan; Guatemala.