The Dogbanes of the JJistricf of Coliimbia. 83 



7)ipt' locdllti/. — Probably eastern Canada. 



(h'ogrdphic dhlribntioit. — E:\tstern Xortli Ameriai from Newfouiullnnd 

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

 the plains. 



Zonal position. — Apoct/num andr osiein if olium appears to be an inhabitant 

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

 Upper Anstral /one, bnt probably by accident. 



Ilahititt. — Thickets and fields. 



CJiaradi'i:^. — I'hdit 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 ujiper slightly narrowed ; upperside of leaves glabrous, dusky green, 

 underside of leaves pale, and finely bnt inconspicuously pubescent ; 

 petioles slender, mostly about 5 mm. in length, finely pu])escenton under- 

 side; iiifloresce)ice in small, irregular, terminal and axillary cymes of few 

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

 shorter than leaves ; pedicels5-\0 mm. in length, subulate-bracted at base ; 

 cali/x glabrous, its segments narrow, generally less than half as long as 

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

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

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

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

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



Remarks. — Apocynum androspemifolinin is inunediately recognizable 

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

 and'large, bright pink, nodding llowers 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 develoiiment from the bud to the fully grown 

 flower are shown in the figures (see PI. II. Fig. 1). Througliout 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 ciiarac- 

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

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

 distinct central flower cluster as in A. cannnbi)ium. 



Tiie only specimens of this species positively known to have l)een 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. 11, Fig. 2.) 



Ti/pe No. 340,oit5, 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. 



