82 Miller — The Doghaues of the District of Columbia. 



Synopsis of the Dogbanes of the District of Columbia. 



Corolla conspicuous (white or pink), its lobes spreadinjj; or 



recurved. 



Inflorescence both terminal and axillary ; corolla terete, 



broadlj' campanulate, bright pink, about 8 mm. in 



length, its tube narrowed in the throat at level of tips 



of calyx lobes A. andros-e.mifolium (p. 82). 



Inflorescence strictly terminal; corolla pentagonal, urce- 

 olate to campanulate or tubular, white or pale pink, 

 4-7 mm. in length, its tul)e not narrowed in the 

 throat. 

 Branches mostly green, ascending ; erect white flow- 

 ers (about 7 mm. long) in large, compact, rather 



flat cjMnes ; corolla campanulate A. speciosum (p. 8.'!). 



Branches mostly strongly tingeil with reddish pur- 

 ple, those at least of the u|)per part of the plant 

 widely spreading; suberect white or pale pink 

 flowers (4-() mm. long) in small, loose, irregular 

 cymes; corolla tubular to urceolate. 



Calyx lobes broad, mucli shorter than tube of 

 l)inkish, suburceolate or tubular corolla; 



flowers about 6 mm. in length A. medium (j). 84). 



Calyx lobes narrow, about as long as tube of 

 white, urceolate corolla ; flowers about 5 



mm. in length A. uucholificr (p. 85). 



Corolla inconspicuous (greenish or whitish), its lobes erect or 

 nearly sd. 

 Leaves few, spreading or drooping on slender jjetioles 

 which are usually three times the lengtli of the 



flowers A. nemokai,e (p. 87j. 



Leaves many, ascending on roi)ust petioles which are 

 usually scarcely longer than flowers. 



Leaves glal)rous, from one fifth to one-fourth as 

 broad as long; flowers essentially white; plant 



very slender and much branched A. amsum (p. 88)- 



Leaves pubescent on underside at least, from one- 

 third to one-half as broad as long ; flowers varying 

 from dull green to white; plant stout and rela- 

 tively less branched A. cannabinum (page 86). 



Apocynum androsaemifolium Linnaeus. 



(IM. II, Fig. 1.) 



175;i [.Ipofi/iniiii] (ni/IroHiciiiifoliihrn Linmeis. Species Plantarum, p. 213. 

 J844. lA)>i)ciinntnf()ulr(j.vriiiif<>liiuii] p. inammii De Candolle, Prodr. Svst. 



Nat. Veg., pt. VIIl, p. 439. 

 1898. Apncyimui umh-o.^win'tfoUam Britton and Brown, Illustrated Flora 



Northern United States, Canada, and Brit. Poss , III, p. 3. 



