198 BOTANICAL GAZETTE [SEPTEMBER 
that in damp or rainy weather they do not open at all, and some- 
times very imperfectly even on sunny days. I have observed anthers, 
one or two of whose cells never open, and the remaining cells do 
so only partly. The anthers seem to develop normally in every 
respect except that the tissues do not become differentiated com- 
pletely at the usual point of opening, so as to allow the escape 
of the abundantly formed pollen grains in the ordinary way. It 
was often necessary to exert strong pressure on the cover glass before 
the anther wall would separate at the usual place, and this was true 
even in thin cross-sections. 
The ovary of Jaeta is more pubescent than that of O. Lamarckiana 
or O. biennis. 
The capsule is about the size of that of O. Lamarckiana, but 
different in form from either parent. They form very long spikes 
of fruit before the close of the flowering period. 
Velutina, the other twin hybrid form, is also distinctly different 
from /aeta and all other forms. 
Its stem is about the same height as that of /aeta, somewhat more 
branched, and light grayish, due to the dense pubescence. The 
hairiness of the whole plant is much more pronounced than in any 
of the other forms described, and this fact alone would serve to dis- 
tinguish it from any of them. The stem is not quite so stout as that 
of /aeta, and the aspect of the whole plant is somewhat less vigorous. 
The leaves are grayish green, narrow (more so than in /a¢la), 
trough-shaped, tapering toward each end, and much more pubescent 
than the leaves of any of the other forms. 
The buds are shorter than those of Jaeta, but have a greater 
diameter and are much more hairy. The hairs from the buds, ” 
in the other types, are of two forms, cylindrical and pointed. The 
cylindrical hairs are only a little larger than those of O. bienmis, 
but smaller than in the other types. The pointed hairs are exceeded 
in size by those of O. Lamarckiana, but are larger than those 0 
O. biennis and laeta. These pointed hairs of velutina differ from 
those of /aeta and all the other forms in another respect. In all the 
other forms the pointed hairs are smooth, but in velutina they are 
densely covered by numerous and conspicuous elevations. 
lhe flowers are somewhat smaller than those of /aeta. 
