302 CALIFORNIA ACADEMY OF SCIENCES. 



some variation in the amount of pubescence, one speci- 

 men is much more canescent than the other and the leaves 

 have longer petioles. In the lower leaves the petioles are 

 from 2-3 cm. long, sometimes surpassing the blade, some- 

 times not equaling it. 



It was abundant on the mesa above Butler Spring. 



59. Encelia frutescens Gray, Proc. Am. Acad., viii, 



657- 

 Described as Simsia frutescens in Bot. Mex. Bound., 



89. 



Type localities: "Agua Caliente, on the Gila," "Sierra 

 Prieta, near Fort Yuma." 



Collected near Butler Spring; very scabrous, rayless, 

 and without pappus awns. 



60. Thelesperma gracile Gray, Hook. Kew Journ., 



i, 252. 

 Described as Bidens gracilis Torr., in Ann. Lye, New 

 York, ii, 215. 



Type locality: " On the Canadian." 



Collected at Butler Spring; seen also in other places. 



61. Hymenopappus filifolius Hook., Fl. Bor. Am., 



h 3i7- 



Type localities: "On the undulating arid grounds of 

 the Columbia, near the Walla Walla, and on the banks of 

 the Spokane near the Flathead Rivers." 



Collected near the head of Willow Creek. 



62. Actinella leptoclada Gray, Pac. R. R. Rep., iv, 

 107. 



Type locality: " Santa Antonita, New Mexico." 

 Collected at Butler Spring and near the head of Willow 

 Creek. 



63. Hymenatherum pentachastum DC, Prod, v, 642. 

 Type locality: " In Mexico, around Monterey." 



