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of the two originally described from Kansas and not found in 
California; Rhamnus Purshiana, which extends into southern 
Utah; Rubus leucodermis, extending to the northern part of the 
same state; and Spiraea arbuscula, wholly Californian and Ore- 
gonian. Among the “northeastern and eastern element" enter- 
ing the region ‘‘southward to Idaho and Montana" are erro- 
neously enumerated the following: Abies balsamea, Picea alba 
[P. canadensis], and P. Mariana are not found in the Rockies, 
reaching the foothills of the same only in the upper valleys of 
Piece and Liard rivers in Alberta. The specimens of P. alba 
or canadensis reported from southern Alberta, British Columbia 
and Montana, and seen by the writer, all belong to P. albertiana 
S. Brown. Ulmus americana and Quercus macrocarpa have been 
found in the region only in the Black Hills; and Bryanthes 
[Phyllodoce] empetriformis is a western not an eastern species. 
On page 248 it is stated that the Southern Rocky Mountain 
Region is clearly distinct from the Northern Region ‘‘ by the 
injection of floral elements derived from Mexico and the Great 
Basin.” А list of 16 species follows. Of these Acer glabrum is 
endemic to the Rockies. Berberis repens, Juniperus scopulorum, 
Clematis ligusticifolia and Lonicera ciliosa are just as common in 
the northern as in the southern Rockies. Artemisia dracuncu- 
loides is eastern, but found in both. Rosa nutkana and Gaulteria 
myrsinites are northern, the former not found at all and the 
latter rarely in the southern Rockies. None of them belong to 
Mexico and only a few of them are found in the Basin. Tetra- 
dymia glabrata, enumerated among those that have entered from 
the northwest, belongs to the Great Basin. On page 249 is given 
a list of a small element "confined to the Central Mountains.” 
In this list is included Fraxinus anomala, a canyon plant, not 
found in the mountains proper and barely reaching the region 
from the southwest. In the list of plants ranging from Colorado 
northward is enumerated Ceanotus ovatus, a species of the plains 
and prairies, extending into the region only in Colorado and the 
Black Hills, and Salix irrorata, confined to the Southern Rockies. 
In the list of Great Basin plants, on page 250, are enumerated 
Ceanotus velutinus and Physocarpus Torreyi, both typical Rocky 
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