The Dogbanes of the District of Columbia. 83 



Type locality. Probably eastern Canada. 



Geographic distribution. Eastern North America from Newfoundland 

 (specimen in U. S. Nat. Herb.) to Georgia (Britton and Brown), west to 

 the plains. 



Zonal pos'dton. Apoci/num androsiemifolium appears to be an inhabitant 

 of the Transition zone and Lower Boreal zone, occasionally reaching the 

 Upper Austral zone, but probably by accident. 



Habitat. Thickets and fields. 



Characters. Plant robust, 1 to 1.5 m. high, from a perennial horizontal 

 rootstock ; branches dichotomously widely spreading, glabrous, strongly 

 tinged with purple; leaves spreading, mucronate tipped (about 55x40 

 mm.), the uppermost ovate oblong, the lower broadly rounded at base, 

 the upper slightly narrowed ; upperside of leaves glabrous, dusky green, 

 underside of leaves pale, and finely but inconspicuously pubescent ; 

 petioles slender, mostly about 5 mm. in length, finely pubescent on under 

 side; inflorescence in small, irregular, terminal and axillary cymes of few 

 nodding flowers, the axillary clusters generally the smaller ; cymes usually 

 shorter than leaves ; pedicels 5-10 mm. in length, subulate-bracted at base ; 

 calyx glabrous, its segments narrow, generally less than half as long as 

 corolla tube ; corolla bright pink, in fully developed flowers about 8 mm. 

 long, widely campanulate, its tube terete, the throat narrowed at level 

 of tip of calyx lobes ; corolla segments rounded at tip, considerably more 

 than half as long as tube, and when fully developed conspicuously re 

 curved ; pods drooping, about 170 mm. in length. 



Remarks. Apocymim androssemifoliuin is immediately recognizable 

 among the species occurring in eastern North America by its ovate leaves, 

 and large, bright pink, nodding flowers in partly axillary clusters, and 

 by the terete corolla tube, distinctly narrowed in the throat. The out 

 line of the corolla varies much in different stages of growth. Some of the 

 forms that it assumes in its development from the bud to the fully grown 

 flower are shown in the figures (see PI. II, Fig. 1). Throughout its 

 growth, however, the corolla tube is strictly terete, while in all of the 

 plants with which the species might be confused the pentagonal con 

 tour of the corolla is evident even in the half-grown buds. The charac 

 teristic form of the corolla is for the most part lost in dried specimens. 

 On account of the dichotomous branching of the stem, there can be no 

 distinct central flower cluster as in A. cannabinum. 



The only specimens of this species positively known to have been col 

 lected in the vicinity of the District of Columbia are two plants which I 

 found at the roadside between Sligo Branch and Paint Branch, Mont 

 gomery County, Maryland, on June 25, 1899. 



Apocynum speciosum sp. nov. 

 (PI. II, Fig. 2.) 



Type No. 340,395, United States National Herbarium, collected in dry 

 old field, at side of road leading from Silver Spring to Sligo Branch, Mont 

 gomery County, Maryland, June 25, 1899, by Gerrit S. Miller, Jr. 



