Vol. IX] HALL & GRINNELL— LIFE-ZONE INDICATORS 45 



LOWER SONORAN ZONE-^Continued 



Acacia greggii Gray* 

 Astragalus aridus Gray- 

 Astragalus limatus Sheldon 

 Astragalus pomonensis M. E. Jones 

 Cassia armata Wats.* 

 Cercidium torreyanum (Wats.) Sarg.* 

 Lupinus odoratus Heller 

 Olneya tesota Gray* 

 Parkinsonia microphylla Torr.* 

 Parosela californica (Wats.) Vail 

 Parosela emoryi (Gray) Heller 

 Parosela schottii (Torr.) Heller 

 Parosela spinosa (Gray) Heller 

 Prosopis glandulosa Torr.* 

 Prosopis pubescens Benth.* 

 Sesbania macrocarpa Miihl. 

 Fagonia californica Benth.* 

 Larrea divaricata Cav.* 

 Thamnosma montana Torr. & Frem. 

 Krameria canescens Gray 

 Krameria parvifolia Benth.* 

 Condalia parryi (Torr.) Weberbauer 

 Malvastrum exile Gray 

 Sphaeralcea emoryi Gray 

 Sphaeralcea orcuttii Vas, & Rose 

 Fouquieria splendens Engelm.* 

 Eucnide urens (Gray) Parry 

 Petalonyx nitidus Wats. 

 Petalonyx thurberi Gray 

 Echinocactus lecontei Engelm. 

 Echinocactus polycephalus Engelm. 

 Opuntia acanthocarpa Engelm. & Big. 

 Opuntia bernardina Engelm.* 

 Opuntia echinocarpa Engelm. & Big.* 

 Opuntia engelmannii Salm-Dyck 

 Oenothera brevipes Gray 

 Asclepias subulata Dec* 

 Philibertia linearis heterophylla Gray 

 Coldenia palmeri Gray 



