486 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



49° east of the mountains. The most northern record is in the 

 Bear Paw and Little Rocky Mountains in Northern Montana, a 

 little north of Lat. 48°. 



2. Foothills of the northeasterfi slope of the southern Rockies 

 In Wyoming and northern Colorado the eastern foothills of the 

 Southern Rockies are much the same as those of the Northern 

 Rockies already described, but Pseudotstiga mucronata is perhaps a 

 little more common and the sage brush is rare. In some cases 

 the mesas and hills are covered by shrubs, as Cercocarpus mon- 

 taniis, Rhus trilobata, Ribes inebrians, june-berries and roses, 

 occasionally also Celtis rugosa. This description may apply to 

 the foothills north of South Platte River. In this region the 

 pifions and shrub oaks are rare, but south of said river the foot- 

 hills take on a different aspect. In other words, the division line 

 between the northern and southern foothills is on the eastern 

 slope of the Rockies over two degrees further south than the line 

 between the northern and southern division in the Montane Zone. 



3. Foothills of the southern and western slopes of the southern Rockies 

 This division takes in the eastern slope south of the South 

 Platte River (about Lat. 39° 30'), the whole southern slope and 

 the western slope, at least as far north as the Grand River, prob- 

 ably as far north as Yampa River (Lat. 40° 30'), and very likely 

 the southern slope of the Uintahs and the eastern of the Wasatches. 

 In these are included the isolated La Sal and Abajo Mountains of 

 southeastern Utah, but the Henry IMountains and other mountains 

 west of the Colorado of the West belong to the Great Basin. The 

 flora in the zone is by no means uniform. Often it consists of 

 several belts one above the other, sometimes the species of the 

 different belts are intermixed. If the zonation is present, the 

 belts are often in the following order: (i) Pine Belt, highest; (2) 

 Chaparral Belt; (t,) Pi non-Cedar Belt. 



a. Pine Belt 

 The Pine Belt is mostly made up of an open stand of Pinus 

 scopuloruni, mixed with some Sabina scopulorum and Pseudotsuga 

 mucronata, and arborescent oaks, with Pad us melanocarpa and P. 

 valida, Acer glabrum, Robin ia neomexicana, and species of Crataegus 

 in the- moist cr places. 



