30 



SHORTER NOTES 



Changes in Phanerogamic Names 



By J. C. Arthue 



In studying and listing the rusts of the western hemisphere, 

 and bringing the names of the hosts under a uniform nomen- 

 clature, the following new combinations have arisen, which it is 

 desirable to establish. 

 v/ Bivoneaurens (L.) comb. nov. {Jatropha urens L. Sp. PI. 1007. 

 1753 Cnidoscolus urens Arth. Torreydi 21: 11. 1921). A com- 

 mon plant of tropical America bearing Uromyces oaxacanus Diet. 

 & Holw. 

 ^ Chamaesyce cordata (Meyen) comb. nov. {Euphorbia cordata 



Meyen, Reise um die Erde 150. 1843). 

 '^ Chomaesyce clusiaefolia (Hook. & Arn.) comb. nov. {Euphorbia 

 clusiaefolia Hook. & Arn., Bot. Beechey's Voyage 95. 1841). 



Chamaesyce Hookeri (Steud.) comb. nov. {Euphorbia Hookeri 

 Steud., Nomencl. Bot. ed. 2, 1: 612. 1840). The three preceding 

 species occur in Hawaii, and bear rusts native to the islands. 

 1/ Coleosanthus adenocarpus (B. L. Robinson) comb. nov. {Brick- 

 ellia adenocarpa B. L. Robinson, Mem. Gray Herb. 1: 93. 1917). 

 This species bears Pucciniosira Brickelliae Diet. & Holw., in 

 Guatemala. 



Dasystephana Newberryi (A Gray) comb. nov. {Gentiana Neiv- 

 berryi A. Gray, Proc. Am Acad. 11: 84. 1876). Native of central 

 California : bears Puccinia Gentianae (Str.) Link. 



Tithymalus leptocerus (Engelm.) comb. nov. {Euphorbia lep- 

 /ocgra Engelm.; Torrey in Pacific Railroad Rep. 4: 135. 1857). 

 Mountains of California and adjacent states; bears Melampsora 

 monticola Mains, a native rust not known until recently, but 

 now abundantly collected. 

 Purdue University, 



Lafayette, Indiana. 



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