THE YUCCEAE. 115 
Y. longifolia Karwinsky in Schultes, Syst. Veg. 17731715. (1830). 
This was referred to the genus Dasylirion, under the same specific 
name, by Zuccarini (Allgem, Gartenzeit. 18388. — Pl. nov. v. min. cogn. 
4: 224. pl. 7. — Regel, Gartenflora. 8 : 37), and afterward and apparently 
correctly to Beaucarnea, under the same name, by Baker (Lond. Journ. 
Bot. 1872: 324). Hemsley (Biol. Cent.-Amer. $3372) uses the same 
specific name under the equivalent genus Nolina. Professor Radlkofer 
has kindly sent me specimens from the plants still cultivated at Munich, 
from Karwinsky’s seeds. 
Y. pitcairnifolia Karwinsky in Sweet, Hort. Brit. 707. (1839). [ed. 3.] 
Published without description but ascribed to Mexico, and from the 
specific name perhaps the plant collected by Karwinsky to which Zucca- 
rini (Allgem. Gartenzeit. 6: 258) gave this specific name under the genus 
Dasylirion, from which in 1840 he transferred it to Hechtia under the 
specific name glomerata, (Plant. nov. v. min. cogn. 4: 240. pl. 6). 
Y. rubescens Pasquale, Cat. R. Ort. Bot. di Napoli. 108. (1867). 
A catalogue name only, not capable of being placed. 
Y. serratifolia Karwinsky in Schultes, Syst. Veg. 17? : 1716. (1830). 
This was correctly referred to Dasylirion, under the same specific 
name, by Zuccarini (Allgem. Gartzenzeit. 1888, — Plant. nov. v. min. 
cogn. 4: 225). I am indebted to Dr. Radlkofer for specimens from 
plants still cultivated in Munich, from Karwinsky’s seeds. 
Y. spinosa HBK. Nov. Gen. Sp. 1 : 289. (1815). 
The original specimen of this, from Actopan, Mexico, in the Berlin 
herbarium, is said by Engelmann (Trans. Acad. St. Louis. 8 : 24, 55) to 
be composed of the flowers of Yucca, similar to those of Y. Treculeana 
(which occurs in that region) and the leaves of Dasylirion acrotrichum. 
It would be very far-fetched to apply this name, based on foreign leaves, 
to Y. Treculeana, over which it has long priority. 
Y¥. stenophylia Steudel, Nomenclator. 2 ; 795. (1841). [ed. 2]. 
This name, without description, which is substituted for Karwinsky’s 
name Y. angustifolia, pertains to a Mexican plant, which might equally 
well belong to Yucca, Beaucarnea, or Dasylirion, and concerning which I 
have been able to get no information. 
The following artificial hybrids which Mr. Sprenger pro- 
poses fully characterizing shortly, but which can not be 
placed even in the analytical key given above, are included 
by him in two trade lists, issued respectively in September, 
1901, and January, 1902 :— 
Y. < albella Sprenger, Lists 1, 2. 
Y. X elegantissima Sprenger, Lists 1, 2. (Y. filamentosa major 2 & 
Y. gloriosa). 
