736 
Journal of Agricultural Research 
Vol. XXVIII, No. 8 
most important annual in creosote bush areas in the Gila Valley, and Cryptanthe 
intermedia (A. Gray) Greene in the Coachella Valley. Plants of Amsinckia 
menziesii (Lehm.) Nels. & Macbr. and Thelypodium lasiophyllum (Hook. & Arn.) 
Greene, tall annuals that grow clustered around the base of the creosote bush, 
are common to both the valleys. The other annuals or biennials recorded for 
the Gila and Coachella Valleys are given below: 
Fig. 6 .—A 1-meter quadrat taken in the 10-meter quadrat, illustrated in figure 5, to show the annual flora 
in the creosote bush association. The letters indicate the location of each individual plant. Plantago 
erecta Morris indicated by (P) is the most important annual. The other annuals and small perennials 
are as follows: 
A= Astragalus nuttallianusltrichocarpus\ToTr. & Gray 
JS=* Baeria chrysostoma Fisch. & Mey. 
Br= Festuca octoflora Walt. 
C= Calandrima caulescens H. B. K. 
D— Matricaria matricarioides (Less.) Porter 
E—FUago arizonica A. Gray 
AUocarya sp. 
Lc=*Lcpidium lasiocarpum Nutt. 
Pedocarya penicillata (Hook & Arn.) A. DC. 
U*=*Daucus pusiUus Michz. 
Mapped March 29,1915, Chandler, Ariz. 
ANNUAL AND BIENNIAL SPECIES OF THE CREOSOTE BUSH ASSOCIATION IN THE 
COACHELLA VALLEY 
Common or Frequent 
Plantago erecta Morris. 
Cryptanthe intermedia (A. Gray) 
Greene. , 
Baeria chrysostoma Fisch. & Mey. 
Sphaerostigma veitchianum (Hook.) 
Small. 
Chylisma scapoidea (Nutt.) Small. 
Pedocarya penicillata (Hook. & Arn.) 
A. DC. 
Thelypodium lasiophyllum (Hook. & 
Arn.) Greene. 
Chylisma cardiophylla (Torr.) Small. 
Chamaesyce melanadenia (Torr.) Millsp. 
Lupinus concinnus Agardh. 
Lepidium lasiocarpum Nutt. 
Conanthus demissus (A. Gray) Heller. 
Eriogonum thomasii Torr. 
Calyptridium monandrum Nutt. 
Amsinckia menziesii (Lehm.) Nels. & 
Macbr. 
Phacelia crenulata Torr. 
Eremalche exilis (A. Gray) Greene. 
Mentzelia albicaulis Dougl. 
Dithyrea californica Harv. 
