April 23, 19^0 
Beay M r. White, 
I am enclosing a list of Identifications for the 136 numbers 
contained In the second shipment of your 1939 & exlean collections , 
which are mentioned In your letter of the 11th. The collection 
contains some plants of unusual Interest since many of the specimens 
came from within the marked endemic area In extreme western Coahulla. 
Your new species of Haploesthes la d very distinct and adds a second 
member to this formerly monotyplc genus . 
Where do you plan to go next Summer? If you have not made 
final plana here are some suocestlona. From Saltillo there Is a 
road which goes SE up across the face of the mountains ( fronting 
Saltillo) to Diamante Pass and Into the mountain valleys bey nd. 
The road is steep but safe and the collecting along it la magnified ent 
Every thing from bahada, chaparral, pine-belt to mountain grass-land 
all within a couple hours from Saltillo. Shreve and I went ofrer the 
road In 1938 but I know of no other botatdhst who has even seen the 
road. It is a rich new field and a wonderful collecting opportunity. 
One could spend the whole summer collecting along that road and back Int 
the Sierras. 
®regg, Wlslizenus and Thurber(after Berlandier) are the 
first collectors In the desert lnterraontane plateau. Gregg and 
Wlslizenus travelled the same road from Chihuahua to Saltillo and 
a good description and map la found in Wlslizenus M ernolr. Thurber 
was with John R. Bartlett (see his Personal Narratlve-1854-56) who 
has given a map and a dfcsirlotlcn of their route, from Chihuahua to 
Saltillo. Bartlett also has an account of his visits to your country 
on the Chihuahua -Sonoran boundary (Thurber accompanied him as botanist) . 
Some botanist should follow the old rood from Saltillo to 
Parras and make a collection^ of topotypes. Also a day or so should 
be 3pent at Pena pass (west of Parras and NE of Vlesca) where the 
adjacent numerous canyons and ridges should produce a lot of exciting 
plants. The San Lorenzo of Wlslizenus and Bartlett is the San Loreruso 
de la Laguna of P aimer, a locality at which Palmer got a lot of 
the rare endemics subsequently found much further north In gyp sum 
soils north of M ohovano. Ill bet there Is a big gypsum flat near 
San Lorenzo and that Palmer collected on It. 
In 1938 Shreve and I took the newly made road from Mapiml 
west to Palmlto Dam on the upper Hazas. The road Is a beauty going 
from the edge of the bolson ,strlaght west through mixed chaparral, 
across the wonderful Zaroa grasslands, over the crests ( oak- Juniper) 
of the Sierra de Zaroa and then down to the upper Hazas. The road 
offers a wondeful chance for a collector. In fact one could collect 
several weeks along It. Then go north to Inde and Parral from 
Polmito Dam. The crests of the Sierra de Zaroa and the country 
about Cadena Pass should produce a lot of fine plants. The Cadena 
area Is an hour west of M apiml and Is a point on the Gregg- Wlslizenus 
route. The slopes of the mountains should be fine collecting places. 
Dr. Bartlett has written me asking If the A. A. could 
contribute to this next collecting trip. Dr. Merrill Is away at 
present. However, I am Inclined to believe I can prevail on Dr. M . 
to help with your good work. I will write Dr. Bartlett as soon as I 
get definite word. ; \ 
With best of regards, N \ H/iV /) t 
17'. \ ' / • • / — 
