THE YUCCEAE. 117 
The species may be differentiated as follows : — 
Perianth-tube conical, under 10 mm. long. S. Faxoniana. 
Perianth-tube 12 to 25 mm. long. 8. Carnerosana. 
S. Faxoniana Trelease. 
Yucca australis Trelease, Rept. Mo. Bot. Gard. 43190. pl. 4, 5.— 
Coulter, Contr. U. S. Natl. Mus. 2 3 436, in part. 
Y. macrocarpa Sargent, Gard. & Forest. 8 3301, 305. f. 42. 9¢ 104. 
Siiva. 103 13. pl. 499. 
Arboreous, 1.5 to 5 m. high, .3 to .6 m. thick, simple or few branched 
at top. Leaves 50 to 75 mm. wide, 1 to 1.25 m. long, openly concave to 
the end, shagreen-scabrid only on the dorsal angles if at all, coarsely 
filiferous but at length with only a few persistent short pectinate threads 
near the apex and a cobwebby mass of detached fibers at base. Panicle 
short stalked, broadly pyramidal, rather loosely branched, with very large 
persistent at length brittle white bracts. Flowers expanding 50 to 100 mm., 
white; perianth tube scant 10 mm. long. Fruit oblong-ovoid, 25 to 75 
mm. long and 25 mm. in diameter. — Plates 69-71. 78, f. 2. 81, f. 11. 
About Sierra Blanca, Texas, and presumably extending 
southwards into Mexico. — Plate 94, f. 2. 
Travelers who pass Sierra Blanca, in western Texas, by 
daylight, are usually interested in the scattering forest of 
low Yucca-like trees covering the surrounding country, a 
number of which are planted about the section-house and 
in what was formerly a very attractive collection of succu- 
lents at the railroad station. 
In the absence of type material or any collections from 
the type localities, these trees have been considered to 
represent the Yucca baccata macrocarpa of Torrey, and, 
under the name Y. macrocarpa or its partial synonym 
Y. australis, are described and figured in several places. 
Associated with them are numerous specimens of Y. radiosa 
and, in smaller numbers, the true Y. macrocarpa of the 
great bend of the Rio Grande, which, as has been shown 
above, is a well-marked species and preserves all of the 
floral characters of a true Yucca; and, as indicative of their 
probable range to the southward, it may be mentioned that 
they are accompanied by Agave applanata, which, in its 
typical form, is not known elsewhere in the United States. 
