The Dogbanes uf the Dldfld of Culani/na. 81 



indebted to Mr. Chas. Ballard, of Cambridge, IMhhs. , both represent 

 l)road-leaved plants of the caunuhituun. type. R. Brown's description * 

 refers merely to a lanceolate-leaved, glabrous plant. It contains no refer- 

 ence to any of the peculiar characters of Apocynum alhum. The same is 

 true of the accounts given by Torrey and Hooker. It seems oljvious, 

 therefore, that unless better evidence can be brought forward than that 

 furnished by the original description, the name glaberiiinnm is too vaguely 

 defined to supplant the well-established name album. At most it can 

 perhaps be used for one of the numerous forms of ApocipuDii cainiabhmm. 



Hypeiicifolium. Apocynum Jiypericifolmm Alton, Hortus Kewensis, I' 

 p. o04, 1798, is a clasi^ing-leaved green-flowei'ed plant that has not yet 

 been detected in the neighborhood of the District of Columbia. Although 

 recorded from Virginia f the species is now known from the region west 

 of tlie Alleghenies only. 



Incanum. [Apocynum (ludrosniuifolinm \ [i. Incainun De Candolle, Prodr. 

 Syst. Nat. Kegn. Veg., pt. VII I, p. 439, 1844, is merely an unusually 

 l)ubescent individual of Apocynum androsicmifollum. Such plants not in- 

 frequently occur, but they do not represent a definite form. 



Medium. Apocynum medhun Greene, Pittonia, III, p. 229, December, 

 1897, is a small-flowered member of the androssemifolium group. It was 

 first recorded by Holm as Apocynum nndrosxmifolium. 



Pubescens. Alpocynum] pubescens R. Brown, Mem. Wern. Nat. Hist. 

 Sue, I, (1808-10), p. 68, 1811,+ from Virginia, is a pubescent form of 

 A. cunnablnum, probably worthy of recognition byname. Aplantagree- 

 ing closely with the original description is not uncommon in the District 

 of Columl)ia; and the U. S. National Herbarium contains a specimen 

 collected in Virginia. This is a whitish-flowered species probably dis- 

 tinct from the A. pubescens of Britton and Brown.? 



*"J. cannabinum, foliis lanceolatis utrinque acutis, glabris, cymis 

 pauiculatis, calyce tubum coroUye aequante." This copy I owe to Mr. 

 Chas. BuUard. 



t De Candolle, Prodr. Syst. Nat. Regn. Veg., pt. VIII, p. 440, 1844. 



t Professor N. L. Britton has kindly sent me a copy of the original de- 

 scription of Apocynum pubescens. It is as follows: "A. pubescens, foliis 

 ovato-oblongis mucronatis ; basi obtusis ; utrinque cymaque breviore 

 })ubescentibus, calyce corollam subjequante. 



" Ilab. In Virginia, Mitchell, in Herl). Banks, [ubi V. S.]." 



I 111. Flora N. United States, Canada, and Brit. Poss., Ill, p. o. 1898. 



