86 Miller— The Doglxuies rjf the Distrlef of Cohrmhia. 



finally slightly longer; pedicels 3-5 mm. in length, subnlate-bracted at. 

 ba.se ; calyx glabrous or pubescent, its segments very narrow, generally as 

 long as corolla tube ; corolla white or just perceptibly tinged with pink ; 

 al)out 4-5 mm. in length, urceolate, its tube conspicuously pentagonal, 

 the tliroat not narrowed, corolla segments pointed, slightly more tlian 

 half as long as tube, spreading l)ut not recurved; pods drooping, aliont 

 itO mm. in length. 



A'f?ii((rA-,s.— Although at first sight Apoci/iutm urceolifev ratiier closely 

 resembles .-1. medJinn, the two plants are readily distinguishable. In 

 habit they are essentially the same, but A. nrceolifer is smaller and its 

 stems are usually less strongly tinged with reddish purple, though in all 

 probability neither character is constant. Its flowers are smaller than 

 those of .-I. uied'mm, and generall}' pure white, though sometimes faintly 

 tinged with pink. The coi'olla is more conspicuously pentagonal, and 

 vei-y noticeably contracted at base of segments. The corolla segments 

 are relatively longer and narrower than in A. medium, and distinctly 

 pointed instead of rounded or obscurel}' pointed at tips. The calyx 

 lobes are generally as long as the corolla tube, and frequently longer, 

 sometimes a little spreading at tips, while in A. medium thej' are less than 

 half as long as corolla tube and always closely appressed. 



I have seen this plant growing at the type locality only. It is there 

 connnon on the southeast slope of the hill directly north of the quarry. 

 Mr. \V. R. Maxon has collected it at the side of the Military Road, be- 

 tween Brightwood, D. C, and Rock Creek. 



Apocynum cannabinum Linnanis. 



(PI. II, Figs. 6-7.) 



1753. \_Apocymun'] cnn)iahimuii Linnteus, Sp. Plant., p. 213. 



1811. A\_pociinum\ pubesccus R. Brown, Mem. Wern. Nat. Hist. Soc. , I, 



p. 68 (Virginia). 

 1844. '[Apoci/num (■antiubinuinl a glaherriiniDn De Candolle, Prodr. Syst. 



Nat. Reg. Veg., pt. VIII, p. 434 (eastern North America). 

 1881. Aprx-i/tiiun c(tiinahi)ta)ii. Wiuxl, Guide to Flora of Washington and 



Vicinity (Bull. 22, U. S. Nat. Mus.), p. 97. 

 18!*8. Apocjpium canaahinnin Britton and I3rown, III. Flora N. United 



States, Canada, and Brit. Poss., Ill, j). 3. 



Tfipe locuHty. — Probal:)lj'^ eastern Canada. 



Geographic distribution. — Eastern United States and southeastern Can- 

 ada. Western limits of range not known. 



Zonal position. — Transition and Austral zones. 



Htdtitat. — Fields, thickets, and open woods. 



Cliaracters. — Fluid robust, 1 to 1.75 m. high, from a perennial, horizon- 

 tal, widely spreading rootstock ; branches ascending, glabrous to densely 

 velvety pubescent, green to reddish purple; leaves ascending, mucronate 

 tipped, usuall}' oblong and slightly more rounded at base than at tip, 

 but often, especially the upi)erm()st, tapering equally at each end, and 

 lowermost frequently slightly cordate ; dimensions when full grown about 

 120 X 55; upperside of leaves green, varying much in shade, generally 

 glabrous but occasionally velvety pubescent ; underside paler and usually 



