THE YUCCEAE. 67 
Y. X rigida Deleuil, described by M. André,* 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. rupicota Scheele, Linnaea. 23: 143. (1850). — Le- 
maire, Ill. Hort. 18: 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.— Rept. Mo. Bot. Gard. 3: 163. 
eee 
Y. rupicola tortifolia Engelmann, 1. c. 
Y. lutescens Carriére, Rev. Hort. 1858 : 579. 
Y. tortilis Hort. 
¥. 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 to6 x 7 to 9 mm. — Plates 
37-39. 84,f.2. 
South-central Texas, from Tarrant County southwest- 
ward to and probably acrossthe boundary.—Plate 93, f. 2. 
One of the early discoveries of Lindheimer (1845), and 
Trécul (1848-9), sufficiently distinct from all of its con- 
geners. Dr. Engelmann designated it as a. tortifolia, to 
distinguish it from his 8. 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). 
