Jan. 13, 19$0 
Beer ? ro feasor Bartlett, 
I a iE enclosing my list of Identifications covering that very 
Interesting lot of plants collected In Mexico by Mr. ’Shite In 1939. 
I have not only greatly enjoyed working over M r Nhltes's plants, 
but I have also found it very profitable as well. Mr. Nhite is a good 
eoll»cto^ and has the knac/Cof asking- repeated collections o** the 
critic- 1 v roups which need be collected more than once. 
I have been rouvhing out the Chlhuhuon Desert flora for Dr. 
Shrive. Bor this Mr. Whites material has been very helpful, Ind eed . 
His material from the oak and pine country In Chihuahua and adjacent 
Sonora is the first I hnve ever studied from that area. I now have 
a feeling for the flora of the ares, as to composition and Its relations 
with that of adjacent regions, and particularly so with the Chihuahua n 
Desert to the east. Naming this material has be=-n a very vein ble 
experience and one for which I am most grateful# In a similar manner 
Mr. White's material from Nuevo Leon an* eastern Coahuila (M uzoulz, 
San ¥ art in Dam, Monel ova) has given me a better Ides of the flora 
east of the Chihuahuan Desert and In the critical area alone- Its 
eastern border. You will understand, therefore, that I truly did 
find w ork of the material very enjoyable and most profitable 
My work on the intermontane flora has really Just gotten under 
way; Just far enough so that I see problems in almost every genus. 
"he identifleati -ns I give now are the best for the moment. As I 
scan the list, however, I realize that many will orobobly be modified 
after my work has progress further* In -ome groups the confusion is 
so great that I have not attempted to give the soeeles. However, 
all the collections will be oUed In my report, eventually. 
You will notice that I have not report ed on the Conifers, Oaks 
