136 DR. D. LYALL ON THE BOTANY 
Caryophyllacez, Portulacee, Rosaceæ, Crassulacer, Saxifragacee, 
Vacciniacew, Orchidacee, Liliacee, &c., of which species are so 
plentiful in the first region, have here comparatively few represen- 
tatives, whilst others, such as Leguminose, Onagracee, Polemo- 
niacee, &c., are more common in this district and give a cha- 
racter to the vegetation; the genera of many other orders are 
about equally numerous in both. 
The following is a list of plants observed only on the compara- 
tively barren grounds of the Columbia valley and in the neighbour- 
hood of the Dalles and Walla Walla, with their geographical 
distribution :— 
Delphinium azureum, Mz. United States. 
Peonia Brownii, Doug. N.W. America only. 
Vesicaria Ludoviciana, DC. Local. 
Ceanothus integerrimus, H. & A. Local. 
Glycyrrhiza glutinosa, Nutt.? Local. 
Petalostemon macrostachyus, Torr. 
Trifolium fimbriatum, Lindl. Local. 
variegatum, Nutt.? Local. 
Hosackia stolonifera, Lindl. Local. 
—~— decumbens, Bth. Local. 
Astragalus succumbens, Doug. Local. 
lentiginosus, Doug. Local. 
— Canadensis, L. E. and W. of Rocky Mountains. 
Phaca podocarpa, Hook. Local. 
Lupinus leucophyllus, Doug. Local. 
Thermopsis fabacea, DC. Local, and Kamtschatka. 
(Enothera albicaulis, Nutt. Oregon and Saskatchewan. 
—— triloba, Nutt.? Red River and Arkansas. 
—— parvula, Nutt. Local. 
andina, Nutt. Local. 
— densiflora, Lindl. Local. 
—— quadrivulnera, Doug. Local. 
Silphium ? leve, Hook. Local. 
Balsamorhiza hirsuta, Nutt. Local. 
Helianthus petiolaris, Nutt. Only Missouri and Arkansas. 
Layia glandulosa, H. & 4. Local. 
Antennaria dimorpha, Nutt. Local. 
Stephanomeria minor, Nutt. Platte River. 
Gilia Hookeri, Bth. Local. 
Lithospermum ruderale, Doug. Local. 
Amsinckia lycopsoides, 4. DC. Local. 
Eritrichium leucopheum, 4. DC. Local. 
Heliotropium Curassavicum, L. Generally distributed. 
Pentstemon triphyllus, Doug. Local. 
