Key 



(sections addressed in this report are in bold): 



Humid Temperate Domain 



Marine Division (240) 



Pacific Lowland Mixed Forest Province (242) 



Willamette Valley and 

 Puget Trough Section(242A) 



Marine Regime Mountains (M240) 



Cascade Mixed Forest — Coniferous Forest — 

 Alpine Meadow Province (M242) 



Oregon and Washington Coast 

 Range Section (M242A) 



Western Cascades Section (M242B) 



Eastern Cascades Section (M242C) 



Mediterranean Regime Mountains (M260) 



Sierran Steppe — Mixed Forest — Coniferous 

 Forest — Alpine Meadow Province (M26I) 



Klamath Mountains Section (M26I A) 



Southern Cascades Section (M26 1 D) 



Modoc Plateau Section (M26IG) 



Dry Domain 



Temperate Steppe Division (330) 



Great Plains — Palouse Dry Steppe Province (331) 



Palouse Prairie Section (33 1 A) 



Temperate Steppe Regime Mountains (M330) 



Middle Rocky Mountains Steppe — 

 Open Woodland — Coniferous Forest — 

 Alpine Meadow Province (M332) 



Blue Mountains Section (M332G) 



Northern Rocky Mountain Forest Steppe 

 Coniferous Forest — Alpine Meadow 

 Province (M333) 



Okanogan Highlands Section (M333A) 



Temperate Desert Division (340) 



Intermountain Semi-Desert Province (342) 

 Northwestern Basin and Range Section (342B) 

 Owyhee Uplands Section (342C) 

 High Lava Plains Section (342H) 

 Columbia Basin Section (3431) 



Ecological units in Oregon and Washington. Information in chapters 2 and 3 is arranged by ecological 



sections. Source.- Bailey et al. 1 994. 



Overview — 4 



