VOL. XIII, PP. 79-90 SEPTEMBER 28, 1899 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



THE DOGBANES OF THE DISTRICT OF COLUMBIA * 

 BY GERRIT S. MILLER, JR. 



Two dogbanes, Apocynum cannabinum and A.androsze.niifoliuni) 

 were recorded in the first detailed list of plants of the District of 

 Columbia, published nearly seventy years ago.f In 1876 the 

 same plants were included in the ' Flora Columbians ' of the Po 

 tomac-Side Naturalists' Club, without special comment.^ Five 

 years later Ward relegated the second species to the list of plants 

 whose occurrence in the vicinity of Washington is doubtful. At 

 the same time 1 1 he recognized two forms of Apocynum cannabinum, 

 the typical A. cannabinum cannabinum, of general distribution, 

 and A. cannabinum glaberrimum, found only on the flats of the Po 

 tomac River bottom at Little Falls. In 1886 Knowlton discovered 

 a species which he recorded &s Apocynum andros%mifolium*f { and 

 in 1892 ** and 1896 ft Holm published further records of a plant 

 that he supposed to be the same. In 1897 Greene raised the 

 Apocynum cannabinum glaberrimum of Ward to specific rank under 

 the name A. album, and at the same time described Holm's A. 



* Published by permission of the Secretary of the Smithsonian Insti 

 tution. 



t Flone Oolumbianse Prodromus, p. 24, 1830. 



t Flora Columbiana, p. 16, 1876. 



\ Guide to the Flora of Washington and Vicinity (Bull. U. S. Nat. Mus. 

 No. 22), p. 12, 1881. 



|| Ibid., p. 97. 



i?roc. Biol. Soc., Washington, III, p. 108. 



** Ibid., VII, p. 118. 



tflbid., X, p. 36. 



20 Riot.. Soc. WASH., VOL. XIII, 1899 (79) 



