Oclubei 31, IL)12 lOI 



Euphorbia hetkrophylla L. Sp. PI. 453. 1753- 

 On the edo;e of Santa Cruz bottom near an irrigation ditch, 

 August 31, 1908, no. 2j/^. This tall succulent annual is plen- 

 tiful in certain rich places along the ditches at this season, 

 reaching a height of two feet and more. The very large leaves 

 possess an outline that is quite unique. Anatomy, habitat and 

 season conil)ine to characterize this plant as a monotype. 



Euphorbia polycarpa hirtella Boiss. 

 On Santa Cruz flood plains, Tucson, Sej)tember 30, 1908, 

 no. 2^^6. On pastured flow land, where it creeps abundantly 

 in mixture with E. niboniarginata. 



Euphorbia mollis Kngelm. 

 Santa Catalina mountains, July 8, 1909, no. j/76. Between 

 Oracle Ridge and the sawmill site, at an altitude of 7800 feet, 

 in the zone of the pines. In flower and fruit. Probably annual. 



Euphorbia campestris C. & S. Linnaea 5: 84. 1830. 



Rincon mountains at Manning camp, altitude 7900 fcet^ 

 July 24, 1909, no. J262. A handsotne anniial of erect habit of 

 the t\ pe of E. crcntilata, but quite distinct. 



Euphokhla dictvosperma F. & M. Ind. Seni. Hurt. Petrop. *^: 



y,- ^835- 



Manning camp, Rincon mountains, altitude 8000 feet, Sep- 

 tember 20, 1909, no. Jj8j. .\n annual similar to the {^receding, 

 growing in a moist canvon bottom. Best preserved behind a 

 rocky point, which gives protection from the dry, destructive 

 wind sweeping thru open parts of the canyon, where many plants 

 have wilted and shrivelled. 



Euphorbia .mhlaxadexia Torr. Pac. R. R. Rep. 4: 135. 1857. 

 Base of Rincon mountains, upper end of Rincon valley, July 

 27, 1909, no. J2j8. This little lowly spreading or slightly 

 raised perennial is very attiaciive becan.se of the great abund- 

 ance of its minute, silky gray-green leaves and the profusion of 

 its flowers, v.-hose dark centers contrast plea'»ino]\ with the 

 white bori.k-r^. It should be of value to '^ardt-ners as a border 



