Vol. IX] HALL & GRINNELL— LIFE-ZONE INDICATORS 57 



TRANSITION ZONE 



Species closely restricted to this zone, and particularly characteristic of it, are 

 marked with a star (*). Species marked U occur also in the Upper Sonoran Zone; 

 those marked C occur also in the Canadian. 



Plants 



Abies concolor L. & G. C ? 



Abies venusta (Dougl.) Koch 



Cupressus macrocarpa Hartw. 



Libocedrus decurrens Torr,* 



Pinus lambertiana Dougl.* 



Pinus muricata Don 



Pinus ponderosa Dougl. (typical form)* 



Pinus radiata Don 



Pseudotsuga taxifolia (Poir,) Britt. 



Sequoia gigantea (Lindl.) Dec. 



Sequoia sempervirens (Lamb.) Endl.* 



Taxus brevifolia Nutt. C 



Torreya californica Torr. 



Camassia quamash (Pursh) Greene C 



Clintonia andrewsiana Torr. 



Lilium pardalinum Kell. U 



Lilium parryi Wats. 



Scoliopus bigelovii Torr. 



Smilax californica (DC.) Gray 



Trillium ovatum Pursh 



Trillium sessile chloropetalum Torr. 



Trillium sessile giganteum H. & A. 



Iris hartwegii Baker 



Iris hartwegii australis Parish 



Iris missouriensis Nutt. 



Castanopsis chrysophylla (Dougl.) DC. 



Gorylus rostrata californica DC. 



Pasania densiflora (H. & A.) Oersted 



Quercus chrysolepis Liebm. U 



Quercus kelloggii Newb.* 



Asarum caudatum Lindl. 



Asarum hartwegii Wats. 



Actaea spicata arguta (Nutt.) Torr. C 



Vancouveria parviflora Greene 



Boykinia major Gray 



