THE YUCCEAE. 67 



Y. X rigida Deleuil, described by M. Andre*,* is a garden 

 hybrid obtained from Y. gloriosa fertilized by Y. cornuta 

 (which is considered to be a synonym of Y. Treculeana), 

 and, as the name rigida, being preoccupied, cannot be re- 

 tained for it, it may be named, after its originator, Y. X 

 Deleuili, in case, as seems desirable for convenience of 

 reference, it and other hybrids are to be designated by 

 binomials. 



Y. RUPICOLA Scheele, Linnaea. 23:143. (1850). Le- 

 maire, 111. Hort. 13: 96. Baker, Gard. Chron. 

 1870: 828. Engelmann, Trans. Acad. St. Louis. 

 3: 48. Garden. 1: 161. Watson, Proc. Amer. 

 Acad. 14 : 253. Baker, Journ. Linn. Soc. Bot. 18 : 

 222. Coulter, Contr. U. S. Natl. Herb. 2 : 436. 

 Bot. Mag. iii. 47.pl. 7172. Reverchon, Gard. & 

 Forest. 6: 64. Kept. Mo. Bot. Gard. 3: 163. 

 pi. 51. 



Y. rupicola tortifolia Eugelmann, 1. c. 



Y. lutescens Carriere, Rev. Hort. 1858 : 579. 



Y. tortilis Hort. 



Y. contorta Hort. 



Acaulescent. Leaves glaucous, pungent, firm or flaccidly spreading, 

 often twisted, .3 to .5 m. long, 25 to 30 mm. wide, the yellowish finely 

 denticulate margin soon turning brown. Inflorescence glabrous, panicled 

 mostly above the leaves. Flowers white or greenish: style white or 

 greenish, oblong, often 3-sided. Capsule thin-walled, with flat or con- 

 cave mucronate valves : seeds rather dull, 5 to 6 X 7 to 9 mm. Plates 

 37-39. 84, f. 2. 



South-central Texas, from Tarrant County southwest- 

 ward to and probably across the boundary. Plate 93, f. 2. 



One of the early discoveries of Lindheimer (1845), and 

 Tre'cul (1848-9), sufficiently distinct from all of its con- 

 geners. Dr. Engelmann designated it as a. tortifolia, to 

 distinguish it from his /3. rigida, spoken of above, with the 

 statement that it is cultivated under the two garden names 

 given in the synonymy. 



* Revue Horticole. 55: 110. (1883). 67: 81. (1895). 



