260 



names on record where phanerogamic botanists may readily 

 find them. 



All the changes have the approval of Dr. Charles F. Mills- 

 paugh, who has passed upon all my material. His departure 

 some time since upon a trip around the world made it impossible 

 for him to publish the names, or even prepare the article. I am, 

 therefore, assuming the responsibility, and propose the following 

 changes : 



Adenopetalum gramineum (Jacq.) Arth. Euphorbia graminea 



Jacq. Select Am. 151. 1763. 

 Chamaesyce arizonica (Engelm.) Arth. Euphorbia arizonica 



Engelm. in Torrey, Bot. Mex. Bound. 186. 1858. 

 Chamaesyce hirsuta (Torrey) Arth. Euphorbia hypericifolia 



hirsuta Torrey, Comp. 331. 1826. E. hirsuta Wiegand, Bot. 



Gaz. 24: 50. 1897. 

 Chamaesyce lasiocarpa (Klotz.) Arth. Euphorbia lasiocarpa 



Klotz. Nov. Act. Nat. Cur. Suppl. 19: 414. 1843. 

 Chamaesyce pilosula (Engelm.) Arth. Euphorbia pilosula En- 

 gelm.; Boiss. in DC. Prodr. 15^: 39. 1866. 

 Chamaesyce Preslii (Guss.) Arth. Euphorbia Preslii Guss. Fl. 



S c. Prodr. 1 : 539. 1827. 

 Chamaesyce potosina (Fernald) Arth. Euphorbia potosina Fer- 



nald, Proc. Am. Acad. 36: 495. 1901. 

 Poinsettia strigosa (Hook. & Arn.) Arth, Euphorbia strigosa 



Hook. & Arn. Bot. Beech. Voy. 310. 1837. 

 Zygophyllidium biforme (S. Wats.) Arth. Euphorbia biformis 



S. Wats. Proc. Am. Acad. 18: 151. 1883. 



As the three species, C. Preslii, C. hypericifolia and C. nutans, 

 are usually grouped in current literature under one name, and 

 differential descriptions are not available, Dr. Millspaugh at 

 my request has supplied the following key. 



Inflorescence glomerate. 



Leaves obtusely serrate, long-pilose at base; seeds black or blackish. 



C Preslii. 

 Leaves sharply serrate, not long-pilose at base; seeds red or reddish. 



C. hypericifolia. 

 Inflorescence solitary. C. nutans. 



