Populus 





Rhnmnaceao 



107-110 



o cuminata 



43 



Rh annus 





alba 



40 



botulaef olia 



109 



an gu s t i £ o ] ia 



43 



calif ornica var# 





? r ac Douga 1 i i 



48 



to.'.cntclla 



108 



sargenti 1 



48 



crocca 



109 



wi s 1 i ?, en i i 



43 



Rhatany 



79 



Portulaca oleracea 



61 



Rhus 





Portulacaceae 



61 



c i smontana 



103 



Potentilla anserina 



71 



ch or i o "ohy 1 1 a 



104 



Prairie Clover 



89 



g labra 



104,105 



Pro sop in 





integrif olia 



104 



oh i Ions is 



78 



lanceolata 



104 



glandule sa 



77,73 



mi c r o phy 11a 



103 



■julif lora 



78 



o vat a 



104 



valut ina 



73 



rvdocrg i i 



105 



Prunus 





tr ilobata 



103 



amor i c ana 



69 



utahensi e 



104 



bes s ey i 



69 



vir'ens 



104 



me lanocarpa 



69 



Rhynochosia 





rufula 



69 



texana 



93 



watsoni 



70 



Ribes 





Pseudotsuga taxifolia 



5 



aureum 



66 



Fsoralia 





cereun 



66 



osculenta 



85 



inebrians 



66 



mi c rant ha 



85 



inerme 



67 



Ptelea trifoliata 



97 



leptanthum 



66,67 



Pfc e r i d ophyt e s 



2 



mescaler ium 



67 



Purple Lilac 



118,119 



p inetorum. 



67 



Purshia tridentata 



70 



Rice Grass 



30,31 



Purslane 



61 



Indian 



30 







Pinon 



31 



Qun.no c 1 id i on 





Ricinus communis 



100 



mul tif lorum 



61 



Rin£ Grass 



29 



Que reus 





Rob in is. 





emoryi 



51 



ne o — nex ic a na 



90,91 



gambellii 



51 



p sou do -acacia 



90 



gunnisonii 



51 



Rock Plant 



71 



havardi 



5^ 



Rock Spirea 



71 



neo-mexicana 



51 



Rocky Mountain Juniper 



5 



turbincl la 



52 



Roc Icy Mountain Llaple 



104 



undulair.a 



51 



.'.'orioa Nasturtium— 





utahensis 



51 



aquaticum 



62 



Rabbit Bushes 



134 



Rosaceae 



68-73 



Ranun cu lac eae 



63 



Rubiaceae 



128 



Raspberry, Red (Vfild) 



72 



dub us 





Rat-Tail 



11 



arizonica 



71,72 



Rattle V/ced 



83 



del iciosus 



72 





81 



strigosus 



72 



Redfieldia flexuosa 



• 35 



Rusnex hymenosepalus 



56 



-149- 



