THE YUCCEAE. 83 
Y. plicata, and Y. angustifolia verag and Y. Treculeana 9 
with various species; and I have knowledge that within 
recent years a very large series of reciprocal crosses have 
been effected by Mr. Carl Sprenger between these sub- 
entire-leaved forms as well as between them and both 
baccate and capsular species, and within the latter groups.* 
In Texas, also, spontaneous hybrids between Y. rupicola 
and Y. Louisianensis appear to occur. 
Everything considered, therefore, the garden intermedi- 
ates between Y. gloriosa, Y. recurvifolia and Y. flexilis 
may at least quite as properly be looked on as being the 
probable results of occasional unrecorded crossing between 
these forms as merely very aberrant sports. Few of them 
appear now procurable, but as far as a knowledge of them 
can be obtained from the brief descriptions, the known hy- 
brids of M. Deleuil are capable of natural arrangement 
under one or the other of these so-called species. 
With respect to the latter, themselves, the same line of 
inquiry suggests itself. The garden Y. flexilis, though in 
its typical form much narrower- and greener-leaved and with 
more elongately pedunculate and lax panicle, appears mor- 
phologically to represent only an extreme development of © 
Y. recurvifolia, with which, except that it lends itself read- 
ily to the coordination of a number of forms in this respect 
comparable with those similarly grouped under Y. recurvi- 
folia, it would logically be connected. The latter itself 
presents to the eye a blending of the characters of Y. glori- 
osa and Y. flaccida, which led one of the best students of 
woody plants, Koch,t to suggest some years since that it 
may be a hybrid between Y. gloriosa and Y. filamentosa, — 
under which name he doubtless meant the recurved-leaved 
plant here called Y. flaccida. No greater reason exists for 
* On the results reached by M. Deleuil see Revue Horticole. 52 ; 226. 
55:109. 68:63. 67381. /. 21-23. — Gard. Chron. n. s. 18 ; 807. 
+ Dendrol. 273 344. 
