84 MISSOURI BOTANICAL GARDEN. 
the rejection of this supposition than in case of the similar 
one that intermediates between Y. gloriosa, Y. recurvifolia 
and Y. flexilis may be the results of various intercrossing, 
since the possibility of crossing Y.gloriosa and Y. flaccida 
has been demonstrated by some of the experiments referred 
to above; and M. Deleuil’s selection of 150 very diverse 
seedlings from a single one of his crosses gives reason to 
suppose that on the one hand a number of different aber- 
rants of these species might have come from even one cross 
seeding, while on the other hand several well verified hybridi- 
zations between Y. gloriosa and Y. flaccida might perhaps 
fail to produce typical recurvifolia. The occurrence of the 
latter along the South Atlantic coast of the United States, 
while it suggests the spontaneous hybrid origin of the typi- 
cal form of this species, does not preclude the possibility 
that the same form, and particularly its aberrant varieties, 
may have originated by a comparable process in gardens, 
where, in fact, they are alone known at present. 
Though Y. gloriosa and Y. jfilamentosa are typically 
very dissimilar in aspect as well as in technical characters, 
I have seen side by side on the sand dunes of Tybee Isl- 
and, Georgia, an acaulescent plant of the spontaneous 
variety plicata of the former and a normal plant of the 
form of the latter known as var. concava, so similar in 
foliage appearance that it was only on close approach that 
the thinner texture and freely filiferous margin of the 
leaves of the latter served for its recognition, and I should 
be even more disposed to believe Y. gloriosa plicata a 
hybrid between Y. gloriosa and Y. filamentosa concava 
than to accept the suggestion of Koch concerning Y. re- 
curvifolia. 
As to Y. gloriosa, I have long thought that I saw in its 
characters somewhat of a blending of those of Y. filamentosa 
and Y. aloifolia, the leaves having something of the firmness 
and thickness of texture of the latter, and something of the 
thinness and concavity of the former or its variety, with 
