318 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Springs, and the more or less immediate vicinity of Laramie, Wyo- 
ming, and of Salt Lake City, Utah, and Yellowstone Park. 
At some time, from the early expeditions of James, Nuttall, and 
Frémont, to the present day of resident collectors, Osterhout, 
Ramaley, Nelson, Jones, and Garrett, nearly every natural region 
of this area has been visited by botanists. But most of the land is 
still practically unsettled, much is reached only with great difficulty, 
since railroad lines are far apart and mostly away from the mountains, 
and many sections have been visited but once or twice, and that at 
only one season of the year, so that even to-day, in spite of a century 
of collecting, it is evident that a great amount of further exploration 
needs to be done. The truth of this will appear after noting in the 
following revision the number of species which have been collected 
but once, but for which it is quite feasible to predict a natural range. 
Such is Penstemon paysonii of the Dolores Valley. 
My own field work, of which primarily this revision is the out- 
growth, was undertaken in the summer of 1915. The itinerary of 
the trip, listing only places for collecting, follows: 
June 5-7. Pueblo, Pueblo County, Colorado. 
8. North Cheyenne Canyon, El Paso County, Colorado. 
9. Manitou, Garden of the Gods, El Paso County, Colorado. 
10. Nob Hill, South Cheyenne Canyon, North Cheyenne 
Canyon, Bear Creek Canyon, El Paso County, Colo- 
rado. 
11, 12. Palmer Lake, El Paso County, Colorado. 
12, Aurora, Denver County, Colorado. 
13. Golden, Morrison, Jefferson County, Colorado; Valverde, 
Denver County, Colorado. 
14. Boulder, Marshall, Boulder County, Colorado. 
15. Denver, Valverde, Denver County, Colorado. 
16, 17. Windsor, Weld County, Colorado. 
17. Horsetooth Mountain, Larimer County, Colorado. 
18. Fort Collins, Owl Canyon, Larimer County, Colorado. 
20. Laramie, Albany County, Wyoming. 
21. Rawlins, Carbon County, Wyoming. 
22. Wamsutter, Sweetwater County, Wyoming. 
23. Point of Rocks, Sweetwater County, Wyoming 
24. Green River, Sweetwater County, Wyoming. 
24, 26. Evanston, Uinta County, Wyoming. 
26, 27. Echo, Summit County, Utah. 
27, 28. Devils Slide, Morgan County, Utah. 
29. Parleys Canyon, Salt Lake County, Utah. 
30. Salt Lake City, Becks Hot Springs, Salt Lake County, 
Utah. 
