16 
Indiana University Studies 
Q. hreviloba (may be distinct) 
Q. bicolor 
Chestnut oaks, Q. Muhlenbergii 
Q, Michauxii 
Q. Prinus 
Q. prinoides 
Eastern evergreen oak, Q. virginiana 
Rocky Mountain oaks, Q. Gambelii and forms 
Q. undulata and forms 
Southwestern live oaks, Q. arizonica 
Q. reticulata 
Q, grisea 
Q. oblongifolia (?) 
A unique species, Q. chrysolepis 
Pacific Coast oaks, Q. dumosa 
Q. durata 
Q. Engelmannii 
Q. lobata 
Q. Douglasii 
Q. garryana 
This must not be considered a final treatment of the 
oaks. It is convenient now because if a species has a variety 
occurring on one oak of a group, related varieties may be 
expected on each of the other oaks of that group. This 
appears true as far as our present data go, but our informa- 
tion is very incomplete. 
GEOGRAPHIC DISTRIBUTION 
The genus Neuroterus is recorded from practically all 
of the oak areas of the world. Altho no material is yet 
recorded from Mexico and Central America, nor from most 
parts of eastern Asia, the occurrence in the first connection 
in the southern portions of the United States, and in the 
later connection in Bengal and Japan leaves no doubt that 
the genus is as cosmopolitan as the oaks. The wide dis- 
tribution is some evidence of the relatively primitive nature 
of the group. 
It has been interesting to find that no one of the subgenera 
is found in both the Old World and America, three groups 
