80 Miller— Thr Doghancs nffhr DIsfrirf ,>f (hlmnhia. 



andivsitinifuUaiii as a new species, A. vicdlinn/'' 'I'hus Apocijiiitni 

 nndrosieinifoUum was again eliminated from the District flora, 

 unless Knowlton's plant should prove to liave 1)een correctly 

 identified. His specimens, however, cannot nt)w be found. Up 

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

 recorded from the vicinity of the District of ('oluml)ia:t Afo- 

 eynnm cannahinnin lAnmcus, A. album. Greene, and A. medium 

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

 from an examination of about two thousand i)lants that Apncy- 

 nnni androsmmfolium is actuall_y a member of the flora, while in 

 addition there occur three hitherto undescribed species. 



NOMENCLATURK. 



Eight names have been based on dogbanes from eastern North Amer- 

 ica. They are as follows : 



Album. Ajxicymon album Greene, Pittonia, III, p. 2o0, December, 

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

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

 and tbroughont its range confined to similar sitnatioiis. Dr. Greene in- 

 forms me tliat the type was collected near Cliain I>ridge, Montgomery 

 County, Maryland. 



Androsaemifoliuin. [Apocyninn] (indroi^iviiufuHiiiii Linna'us, Species 

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

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

 cality of the species. 



Cannabinum. \_Apociinum'] cannaliinum Linnajns, Species Plantarnm, 

 p. 2lo, 1753, is an erect, green-flowered plant of eastern North America. 

 The original descrijition leaves no donbt that the name was nsed by 

 Liimanis in essentially the same sense that it is nnderstood today. 



Glaberiimum. \_Apocipiinn cannabinum} n gliiJn'rrimum De Candolle, 

 Prodr. Syst. Nat. Regn. Veg., pt. VIII, p. 4:]'.), 1844. The description 

 of tliis plant (under Apocjinuin cuun.abinuui) is as follows: " a (jlabcrri- 

 mum. A. Canadense maximum flore minimo herbaceo. Pink. 35, t. 13 

 f. 1. (ic. mediocr.) A. ereclum, etc., ejiisd. t. 2(50. f 4. A. cannabinum R. 

 Br. wern. trans. I. p. BS. Torr. ! fl. im. st. p. 276. A. cannabinum n Hook. 

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

 endum ; eamdem vero plantaui ad A. hypericifolinm retulit cl. Hook. 

 1. c. (v. s.)" This name has recently been used by Brittou 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 Camlolle refer 

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



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



t That is, within a radius of twenty miles from tiie Ca])itol 



