100 MISSOURI BOTANICAL GARDEN. 



mm. and therefore much larger than usual in Y. Schottii, 

 is not otherwise different from the leaves of that species. 

 In 1892 Mr. Marcus E. Jones collected and photographed 

 a Yucca at Chiquilistlan, to which he gives the local name 

 " desoti, " which is doubtless merely a phonetic variant 

 of isote or izote ; and good specimens, evidently of the same 

 species, were made by Mr. Pringle at Zapotlan (no. 4392) 

 and distributed under the name Y. Schottii. 



While the herbarium specimens of this izote of the 

 Mexican state of Jalisco are hardly referable elsewhere 

 than to Y. Schottii, Mexicans in the vicinity of the Pajarito 

 mountains, west of Nogales, assured me that the true 

 Y. Schottii of that region is not the izote that they knew 

 further south, which, as they asserted, is a larger, more 

 branched tree. Photographs taken by Mr. Jones, in fact, 

 show this to be true, at Chiquilistlan, as does the accom- 

 panying plate from photographs taken by me in 1901 at 

 Zapotlan, where, though very abundant in the suburbs, in 

 hedge-rows, etc., the izote appears to occur only as a culti- 

 vated plant. The much larger size, stout trunk enlarged 

 below, more branched habit, and rather more staring 

 leaves, are the only characters by which I am able to dis- 

 tinguish it from Y. Schottii^ so that at most I should call 

 it a variety of the latter. The tree figured by Dr. Eose* 

 from a photograph taken in the vicinity of the city of 

 Mexico, and supposed to represent the izote, is doubtless 

 Y. australis. 



33. Leaves thick and firm, with usually coarser fibers. 

 4. Leaves narrow, falcate, smooth. 



Y. BREVIFOLIA Schott, in Torrey, Bot. Bound. 221. 

 (1859). Engelmann, Trans. Acad. St. Louis. 3: 46. 

 Y. puberula Torrey, Bot. Bound. 221. 



Shortly caulescent, scarcely reaching a height of 2 m., mostly cespi- 

 tose. Leaves green, smooth, rigidly divergent, often falcate, thick, plano- 

 convex, very pungent, .3 to .6 m. long, 6 to 25 mm. wide, the margin freely 



* 1. c.pl. 38. 



