so Mill<>rT!ic Dogbanes nfthr IMnd of Columbia. 



androsxmifolium as a new species, A. medium* Thus 

 androsaeniifolium was again eliminated from the District flora, 

 unless Knowltoirs plant should prove to have been correctly 

 identified. His specimens, however, cannot now be found. Up 

 to the present time, therefore, three species have been positively 

 recorded from the vicinity of the District of Columbia:! <'/"- 

 cynum cannabinum Li imams, A. album Greene, and A. medium 

 Greene. But this number must be more than doubled, as I find 

 from an examination of about two thousand plants that Apocy- 

 num androssemifolium is actually a member of the flora, while in 

 addition there occur three hitherto undescribed species. 



NOMENCLATURE. 



Eight names have been based on dogbanes from eastern North Amer 

 ica. They are as follows : 



Album. Apocynum album Greene, Pittonia, III, p. 230, December, 

 1897, is based on the narrow-leaved, white- flowered plant of the canna 

 binum type common on the shores of the Potomac River near Washington, 

 and throughout its range confined to similar situations. Dr. Greene in 

 forms me that the type was collected near Chain Bridge, Montgomery 

 County, Maryland. 



Androsaemifolium. [Apocynum'] androssemifolium Linnreus, Species 

 Plantarum, p. 213, 1753, is the spreading, large-flowered dogbane of the 

 Boreal and Transition zones. Eastern Canada is probably the type lo 

 cality of the species. 



Cannabinum. [Apocynuiri] cannabinum Linnaeus, Species Plantarum, 

 p. 213, 1753, is an erect, green-flowered plant of eastern North America. 

 The original description leaves no doubt that the name was used by 

 Linmeus in essentially the same sense that it is understood today. 



Glaberrimum. \_ Apocynum cannabinum'] a glaberrimiun De Candolle, 

 Prodr. Syst. Nat. Regn. Veg., pt. VIII, p. 439, 1844. The description 

 of this plant (under Apocynum cannabinum) is as follows: " glaberri 

 miun. A. Canadense maximum flore minimo herbaceo. Pluk. 35, t. 13 

 f. 1. (ic. mediocr.) A. erectum, etc., ejusd. t. 260. f. 4. A. cannabinum R. 

 Br. wern. trans. I. p. 68. Torr. ! fl. un. st. p. 276. A. cannabinum Hook. 

 1. c. t, 139 opt. A. piscatorium Dougl.! mss. ex nostr. specim. hie refer 

 endum ; eamdem vero plantain ad A. hypericifolium retulit c). Hook. 

 1. c. (v. s.)" This name has recently been used by Britton and Brown 

 for the plant described as A. album by Greene. The reason for this 

 course is not clear, as none of the descriptions cited by De Candolle refer 

 to the plant in question. Plukenet's figures, for a tracing of which I am 



* Pittonia, III, pp. 229-230, December, 1897. 



|That is, within a radius of twenty miles from the Capitol. 



