82 Miller The Dogbanes of the District of Columbia. 



SYNOPSIS OF THE DOGBANES OF THE DISTRICT OF COLUMBIA. 



Corolla conspicuous (white or pink), its lobes spreading or 

 recurved. 



Inflorescence both terminal and axillary ; corolla terete, 

 broadly campanulate, bright pink, about 8 mm. in 

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



of calyx lobes A. ANDROSJEMIFOLIUM (p. 82). 



Inflorescence strictly terminal ; corolla pentagonal, urce- 

 olate to campanulate or tubular, white or pale pink, 

 4-7 mm. in length, its tube not narrowed in the 

 throat. 



Branches mostly green, ascending ; erect white flow 

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



flat cymes ; corolla campanulate A. SPECIOSUM (p. 83). 



Branches mostly strongly tinged with reddish pur 

 ple, those at least of the upper part of the plant 

 widely spreading; suberect white or pale pink 

 flowers (4-6 mm. long) in small, loose, irregular 

 cymes ; corolla tubular to urceolate. 



Calyx lobes broad, much shorter than tube of 

 pinkish, suburceolate or tubular corolla; 



flowers about 6 mm. in length A. MEDIUM (p. 84). 



Calyx lobes narrow, about as long as tube of 

 white, urceolate corolla; flowers about 5 



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



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

 nearly so. 



Leaves few, spreading or drooping on slender petioles 

 which are usually three times the length of the 



flowers A. NEMORALE (p. 87). 



Leaves many, ascending on robust petioles which are 

 usually scarcely longer than flowers. 

 Leaves glabrous, from one fifth to one-fourth as 

 broad as long; flowers essentially white; plant 



very slender and much branched A. ALBUM (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. 

 (PI. II, Fig. 1.) 



1753. [Apocynnm] androsasinifofium Linnyeis, Species Plantarum, p. 213. 

 J844. \_Apocynumandrosxmifolium] /3. incanum De Candolle, Prodr. Syst. 



Nat Veg., pt. Vlli, p. 439. 

 1898. Apocynum androvxiuijoliuni Britton and Brown, Illustrated Flora 



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



