320 CONTRIBUTIONS FROM THE NATIONAL TLERBARIUM.,. 
blades ovate or deltoid-ovate, 20 to 40 mm, long and 10 to 25 mm. wide, obtuse 
or acutish at the apex, the base varying, unequal, semicordate, rounded, trun- 
cate, or broadly cuneate, very minutely and sparsely puberulent; petioles 
as long as the blades or longer, pubescent; peduncles longer than the leaves; 
bracts narrowly lanceolate, acuminate, 8 mm. long and 1.5 mm, wide, puberulent, 
‘ciliolate; flowers 15 to 18 mm. long, bright purplish-red, the tubes viscid- 
pubescent; fruit 7 mm. loug and 5 or 6 mm. wide, hispidulous, with a short, 
narrow beak, which is usually depressed below the wings; wings narrow, thin, 
their corners rounded above, surmounted by conspicuous flat disks; seed 2 to 
2.5 mm. long, lanceolate in outline, black, smooth. 
This plant can be separated from A, angustifolia, its nearest relative, by 
its smaller, narrower seed, broader leaves which are not attenuate at the base, 
and more densely pubescent stem. Type U. S. National Herbarium no. 8380254, 
collected at Mesilla, Donna Ana County, New Mexico, June 15, 1897, Wooton 11. 
The plant is very common on the sandhills of the Mesilla Valley, flowering 
from early spring until late in autumn, It has been confused with A. turbinata, 
from which it can readily be distinguished by its prostrate habit and red flow- 
ers, The fruit is distinct, also, and the general appearance of the plant is very 
different. I have little doubt that this is the plant to which Doctor Torrey 
originally applied the name A, turbinata. Doctor Watson, however, in publish- 
ing the description had in mind another plant, one from Nevada which he bim- 
self had collected and which he took to be the same as Doctor Torrey’s. It 
is the Nevada plant which is figured in the plate accompanying the original 
description of A. turbinata, and which is accordingly to be taken as the type, 
although Doctor Watson also mentions several plants which are to be placed 
‘ather in A. torreyi. 
Additional specimens examined: 
New Mexico: Camp 2, Emory’s 55th monument, 1892, J/earns 165; Mexican 
Boundary Survey 1120; Mesilla Valley, 1904, Wooton, and numerous 
other collections from the same locality. 
Texas: Wright 1710 aud 601; El Paso, 1881, Vasey; 1 Paso, 1884,' Jones 
3706; El Paso, 1893, Mearns 1486. 
CninvuaAHua: Paso del Norte (Ciudad Juarez), ISS8S5, Pringle T7; Juarez, 
1901, Pringle 9465; sandhills below El] Paso, 1846, Wislizenus 98; 
Ciudad Juarez, 1905, Purpus, 
EXPLANATION OF PLATE NXXVIIT.—a«. Vlant of Abronia torreyi; b, fruit of same, 
a, Seale 1: b, seale 2. 
26. Abronia angustifolia Greene, Pittonia 3: 344. 189s. 
Abronia turbinata forma stenophylla Weimerl, Ann, Cons, et Jard. Geney, 
5: 190, 1901. 
Abronia angustifolia is much like A. torrcyi; its leaves, however, are lan- 
ceolate, narrowly cuneate at the base; stems minutely puberulent: flowers 15 
mm. long; seed 1.5 mm. or less in length, ovate in outline. 
Specimens cramined: 
New Mexico: White Sands, 1897, Wooton 157, type, and several other 
collections from the same locality by the same collector. 
This is one of the rather few plants that grow upon the great dunes of 
pure white gypsum sand which occur in eastern Donna Ana County, White- 
flowered specimens are occasionally found. The White Sands are separated by 
a high range of mountains from the nearest locality at which A. torreyi occurs, 
the valley of the Rio Grande 40 miles to the west. 
