382 BOTANICAL GAZETTE [NOVEMBER 
for a variety of R. idaeus L. I find the pollen condition to be nearly 
perfect and hence to give every indication that, from a morpho- 
logical basis at least, the plant should be given a specific rank. 
R. neglectus Peck (fig. 2), on the other hand, shows a large percent- 
age, perhaps 50 per cent, of sterile pollen. This condition goes 
very well with the remark made in the Manual that it probably is a 
self-perpetuating hybrid. Fig. 3 is an enlarged view of a portion of 
the field shown in fig. 2. R. occidentalis L., which is the well known 
black raspberry or thimbleberry, is given a specific rank in the 
Manual and the pollen condition indicates that such a position 
is tenable. 
Of the second, or Aaiartomariis group, I have 2 members. 
The first, R. odoratus L. (fig. 4), the beautiful flowering raspberry, 
shows pollen almost universally good. Such a position would be 
expected from the late period in which it bears its flowers. Even 
should it be susceptible to crossing with other members of the genus, 
its lateness in regard to the opening of its buds would make it very 
hard to do so. R. parvifolius Nutt., on the other hand, although 
it is put here as a good species, contains a large percentage of pollen 
which is clearly sterile. 
I have been unable to obtain any material “i the members of 
the third (CHAMEMorus) and of the fourth (CyLactTIs) groups, 
including in the Manual but 3 species. 
It is the fifth or Evsatus group which is by far the largest and 
has given the most trouble. In studying these I have found several 
whose pollen is nearly perfect, so nearly so in fact that the few 
shrunken grains which do appear may be accounted for by some 
unfavorable physiological condition. By far the greater number, 
however, show a greater or less degree of sterility. For convenience 
I have divided these last into those members ranging from sterility 
of about 25 to about 75 per cent; and also those which show a 
range greater than 75 per cent. 
Among those with good pollen appear the following: R. alle- 
ghaniensis Porter, R. setosus var., R. fruticosus L., and R. amnicolus 
Blanch. R. alleghaniensis Porter (fig. 5) and 'R. setosus Bigel. 
(fig. 6) are given specific rank in the Manual.  R. fruticosus L. 
(fig. 7), which is a European form, is suggested here as perhaps the 
