DITAXIS AROniAEA. sp. nov. 
Root perennial; stems many, from crown of root, terete, slender. 25-35 cm, 
tall, and mostly 1-2 mm, in diameter, silvery with short appressed hairs; leaves 
alternate, entire, 3-nerved at the base, elliptis to ovate, silvery on both 
surfaces with short appressed hairs, up to 4 cm, long and mostly 5-8 mm, broad; 
flowers dioecious, but only fruiting specimens were collected; pistillate flowers 
axillary, solitary, pedunculate; peduncle shorter than subtending leaf, 
bibracteolate at 1-2 mm. below the cayx, relatively stout, 5-8 mm. long; pistillate 
flowers with 5 petals, these about ,5 ram. broad and 2 ram, long, acute, midvein 
prominent; sepals 5, ovate-lanceolate, up to 4 mm, long and less than half as 
broad, outer sufface densely silvery-pubescent, the inner surface less densely 
so, with the basal portion frequently green and glabrate; ovary and styles densely 
short-villous; capsules deeply 3-lobed, densely silvery-pubescent, about 5 ram. 
broad and 3 mm. high; seeds insufficiently developed for description. 
This species agrees with Ditaxis aphoroides in being dioecious, but differs 
therefrom in its silvery pubescence, its narrower leaves, in its smaller fruits, 
and in its smaller seeds. 
Type specimen. No, 14972, was collected June 23, 1935, in the western 
edge of the Mustang Desert, at 10|- miles east of Cotulla in LaSalle County, 
Texas, I am indebted to Dr, I, M, Jolinston of the Arnold Arboretum for calling 
to ray attention that this plant is undescribed, and also for suggesting the suita¬ 
bility of argyraea as an appropriate specific name. 
