il-LLpliorbia serrula Fngelm.} - HDH, exp. 



Chamaesyce stictospora (Engelm.) Small - DomOl, KTZ, SFE, W&W, E 

 [Euphorbia stictospora Engelm.] - GPF, HDH 



Croton pottsii (Klotzsch) Mull. -Arg. var. pottsii - KWA, KTZ, JM (not rep.) 



|Craton corymbulosiis Fngelni. | - KWA. KTZ 

 [Croton eremop-hiltis Woo ton & Si;indle\ | - KWA 



Croton texensis (Klotzsch) Mull.-Arg. - DornOl, GPF, HDH, SF!, W&W, E/W 

 [Croton texensis (Klotzsch) Mull. Arg. var. texensis] - IMF, KTZ, UTF 



Ditaxis (see Argythamnia) 



Euphorbia 



(Identification sources: ) 



Euphorbia (see also Chamaesyce) 



Euphorbia agraia Bieb. - DornOl, KTZ 



Euphorbia brachycera Engelm. - IMF, KTZ, UTF, E/W 



[Euphorbia brachycera Fngelm. var. robustn (Fngelni. ) Dorn| - DornOl 

 [Euphorbia robusta (Engelm.) Small] - GPF, HDH, KTZ 

 ITithymalus bracliyeeras (Fngelm.) Small | - SF!. W&W 



(Euphorbia crenulata Engelm.} - HDH, IMF, KTZ, W 



{WJ - This species is native to CA and OR (see Jepson Manual). Presence in CO based on old specimen at 

 COLO from Montezuma Co. that is E. brachycera in my opinion. A disjuction from 1 00 years ago is unlikely; 

 species is not mentioned by other floras of the surrounding status! 

 {Tithymalus crenulatus (Engelm.) A. Heller} - SFW, W&W 



# Euphorbia cyparissias L. - DornOl, GPF, HDH, IMF, KTZ, UTF, E 



ITithymalus cyparissias (I..) Lam.] - SFE. W&W 



Euphorbia dentata Michx. - DornOl, GPF, UTF, E/W 

 [Euphorbia davidii Subils] - IMF, KTZ 

 [Euphorbia dentata Michx. var. cuphosperma Engelm.] - HDH 

 [Euphorbia dentata Michx. var. dentata] - HDH, KTZ 

 [Poinsettia dentata (Michx.) Klotzsch & Garcke] - SF!, W&W 



* Euphorbia esula L. var. esula - DornOl, KTZ, E/W 



[Euphorbia esula L.] - GPF, HDH, IMF, UTF 

 [Euphorbia \ pseudovirgaia (Schur) Soo] - GPF 

 [Euphorbia esula X E. virgata] - GPF 

 [Tithymalus esula (L.) Scopoli] - SF!, W&W 

 ^ Euphorbia esula L. var. uralensis (Fisch. ex Link) Dorn - DornOl, KTZ, E/W 

 [Euphorbia uralensis Fisch. ex Link] - GPF 

 [Tithymalus uralensis (Fisch.) Prokhanov] - SF! 

 ITithymalus uralensis (Fisch. ex Link) Prokhanov] - W&W 



Euphorbia exstipulata Engelm. - DornOl, GREE (Harmon 9507 for CO; Hazlett 12212 for NM), 

 Smith09?, KTZ 



[Euphorbia exstipulata Engelm. var. lata Warnock & M. C. Johnston] - KTZ 

 Euphorbia hexagona Nutt. ex Spreng. - HDH, KTZ, E 



[Euphorbia hexagona Nutt.] - GPF, IMF 



[Zygophyllidium hexagonum (Nutt.) Small] - SFE. W&W 

 Euphorbia helioscopia L. - DornOl 



[Galarhoeus helioscopia (L.) Haw.] - KTZ 



[Tithymalus helioscopia (L.) Hill] - KTZ 



156 



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