OF NORTH-WEST AMERICA. 135 
Calypso borealis, Salisb. Lilium Canadense, L. 
Corallorhiza multiflora, Lindl. Smilacina, three species. 
Platanthera foetida, Geyer. Streptopus amplexifolius, DC. 
Cypripedium parviflorum, Salisb. Trillium grandiflorum, Salisd. 
Along the banks of the Sumass Lake and River and lower part 
of the Chilukweyuk River, and on the clear grounds or prairies of 
the same name, besides numerous representatives of the families 
Juncez, Carices, Graminee, &c., the following plants commonly 
occur, viz. :— 
Ranunculus, several species. Angelica arguta, Nutt. ? 
Nuphar advena, Ait. Symphoricarpus racemosus, Mz. 
Viola, two or three species. Sambucus pubens, Mz. 
Stellaria, two or three species. Viburnum Opulus, L. 
Cerastium, two species. Cornus Canadensis, L. 
Silene Douglasii, Hook. Galium, four species. 
Claytonia, several species. Plectritis congesta, Nutt. 
Geranium Carolinianum, L. Compositz, various. 
Impatiens pallida, Nutt. Apocynum, two species. 
Rhamnus Purshianus, DC. Menyanthes trifoliata, L. 
Cerasus emarginata, Doug. Lithospermum pilosum, Nutt. 
—— demissa, Nutt. Mimulus moschatus, Doug. ` 
Geum macrophyllum, W. ? luteus, L. 
Agrimonia Eupatorium, L. Castilleja, two species. 
Potentilla, two or three species. Prunella vulgaris, L. 
Fragaria, two or three species. Scutellaria, two species. 
Rubus, several species. Stachys, two species. 
Cratægus sanguinea, Pall. Plantago major, L. 
Pyrus rivularis, Doug. Polygonum, several species. 
Amelanchier Canadensis, Torr. & Gr. Populus tremuloides, Mz. 
Epilobium, several species. Corylus rostrata, Ait. 
Ribes, several species. Salix, several species. 
Philadelphus Lewisii, Pursh. Alisma Plantago, L. 
Sium lineare, Mz. Sagittaria variabilis, Engl. 
Cicuta virosa, L. Sisyrinchium, two species. 
(Enanthe sarmentosa, Nutt. 
In the second region, which extends on one side of the Columbia 
from the Dalles to the Spokan River, and on the other side runs 
up through the Okanagan valley and crosses the 49th parallel at 
Lake Osoyoos and the Similkameen, the vegetation is of a very 
different character from that met with on the other side of the 
Cascade Mountains, and bears indications of a much drier climate. 
A good many of the plants found in this region are strictly local 
in their distribution. Excepting by the banks of lakes or streams, 
there are no trees ; and some of the orders, such as Ranunculacee, 
