C. S. Sargent—The Forests of Central Nevada. 425 
The following species, fourteen in number, are common to 
the three Regions: 
Acer glabrum. Ribes aureum. 
Rhus aromatica, var. Cornus pubescens. 
Prunus demissa. Sambucus glauca. 
Spirea discolor, var. icera involucrata. 
Cercocarpus ledifolius. Populus tremuloides. 
Amelanchier alnifolia, Pinus flexilis. 
Fibes cereum. Pinus Balfouriana. 
The following species, twelve in number, are, in addition to 
those named above, common to the Rocky Mt. and Sierra Ne- 
vada Regions: 
Rhamnus Californica. Alnus incana, 
Neillia opulifolia. Pinus contorta 
Cercocarpus parvifolius Pinus ponderosa 
ifolia. Abies concolor 
Ribes leptanthum Pseudotsuga Douglasit 
Juniperus occidentalis 
_ _ All the species of the Nevada Region extend into the Rocky 
_ Mt. Region with the exception of the following ten species: 
Berberis Fremontit. Shepherdia rotundifolia. 
Prunus Andersonti. rrostachys occidentalis. 
Spirea Millefolium. Populus trichocarpa. 
Rosa Californica, var. Pinus monophylia. 
axinus anomala. Juniperus Californica, var. 
lantic Forests, have no representatives in the mid-continental 
Flora: 
Calycanthus. Leucothoé. Tsuga. 
Aisculus. 5 Torreya. 
Cercis. Styrax. 
Cephalanthus. Myrica. 
The following genera of the Sierra Nevada Region have no 
Eastern representatives : 
. Garrya. Castanopsis. 
Adenostoma. jodictyon. ia. 
Heteromeles. Umbellaria. Libocedrus. 
Carpenteria. 
The absence of arborescent and frutescent Leguminose from 
the three ions, where herbaceous genera of this order are 
So largely represented, is remarkable, especially as they abound 
