118 MISSOURI BOTANICAL GARDEN. 



As it occurs from a little way east of Sierra Blanca to 

 the vicinity of Malone, this tree is usually 2 or 3m. high, 

 rarely reaching 5 meters, and the thin-barked stem, which 

 may reach a diameter of about half a meter, very rarely 

 branches, though occasionally one or two ascending 

 branches are produced. Well developed plants, even if 

 small, differ conspicuously from those of Yucca macrocarpa 

 in their rounder head and the usually greater number of 

 their spreading leaves, which, smooth or at most slightly 

 roughened on the occasional dorsal angles, are of a crab- 

 apple green, openly concave to the very short stout spine, 

 and though at first coarsely filiferous, later have only a few 

 short pectinate thickish fibers toward the tip, while the 

 remainder become detached to the base, where they remain 

 in a loosely cobwebby mass between the leaves, which in age 

 become reflexed and normally persist as a thatch on the 

 trunk even to its base. On vigorous plants the leaves 

 attain a width of 75 mm. and a length of 1.25 m. 



This species, which is well described by Professor Sar- 

 gent, under the name Yucca macrocarpa, I take pleasure in 

 dedicating to Mr. C. E. Faxon, whose excellent figures of 

 it in the Silva faithfully represent its technical characters. 



S. Carnerosana Trelease. 



A simple or rarely slightly branched tree, 1.5 to 6 m. high, at length 

 .7 m. in diameter. Leaves as in the last. Panicle on a stout white- 

 bracted stalk, densely branched close above the leaves, glabrous or 

 exceptionally tomentose. Flowers expanding 75 to 100 mm. ; the cylin- 

 drical tube 12 to 25 mm. long. Fruit oblong, 50 to 75 mm. long, 40 mm. 

 in diameter : seeds 7 to 9 X 8 to 10 mm. Frontispiece to article and 

 plates 72-75. 76,f. 1, 77. 81, f. 12. 83, f. 2. 



Northeastern Mexico, from the Carneros pass to about 

 Catorce and Cardenas. Plate 94, f. 2. 



Some years since, Mr. C. G. Pringle made characteris- 

 tically excellent herbarium specimens of a tree which 

 forms large forests about Carneros, Mexico, which were 

 distributed as doubtfully representing a variety of Yucca 



