Eutetras palmeri A. Gray

Eutetras palmeri A. Gray, Proc. Am. Acad. 15: 40. 1879 A low shrub; stem 1 dm. high or more, densely puberulent and glandular; leaves subopposite, petioled; petioles about 1 cm. long; blades deltoid-ovate, dentate, cinereouspubescent, triple-ribbed at the base, 1-2 cm. long, 0.75 cm. wide; heads short-peduncled; involucre broadly campanulate, 7 mm. broad; bracts about 20, subequal in 2 series, 5 mm. high; ray-flowers 9-12; ligules white or tinged with rose, oblong, 3 mm. long; disk-flowers numerous, tubular, 4-toothed; achenes oblong-linear, 4-angled, nearly glabrous, 2.5 mm. long; squamellae 0.3 mm. long; awns 2 mm. long.
Type locality: Near Angostura, 100 miles east of San Luis Potosi.
Distribution: Known only from the type locality.