Vol.. III.] 



DOGBANE FAMILY. 



2. Apocynum cannabinum L. Indian Hemp. Amy-root. (Fig. 2896.) 



Apocynum cannabinum L,. Sp. PI. 213. 1753- 



Root deep, vertical, soon branching. Stem ex- 

 tensively branched, the branches erect or ascend- 

 ing, glabrous or nearly so, more or less glaucous. 

 Leaves oblong, lanceolate-oblong or ovate-oblong, 

 acute or obtuse and mucronate at the apex, nar- 

 rowed or rounded at the base, glabrous above, 

 sometimes pubescent beneath, 2 / -6 / long, }4 / ~3 / 

 wide; petioles i // -6 // long, or sometimes none; 

 cymes dense; pedicels short, bracteolate at the base; 

 flowers 2}i // ~3)4 // broad; calyx -segments nearly 

 as long as the tube of the greenish-white corolla; 

 corolla -lobes nearly erect; follicles similar to those 

 of the preceding species. 



In fields and thickets. Anticosti to British Columbia, 

 Florida and Lower California. June-Aug. 

 Apocynum cannabinum glaberrimum DC.Prodr.8:439. 1844. 



Glabrous; leaves smaller, oblong-lanceolate, acute at 

 each end, or sometimes rounded at the base, seldom 

 over 2%' long and 10" wide, distinctly petioled. On 

 river-shores and similar situations; range apparently 

 nearly of the type, but more abundant northward. 



3. Apocynum hypericifolium Ait. Clasping-leaved Dogbane. (Fig. 2897.) 



Apocynum hypericifolium Ait. Hort. Kew. 1: 304. 



1789. 

 Apocynum cannabinum var. hypericifolium A. Gray, 



Man. 365. 1848. 



Glabrous, often glaucous; stem i-2 high, the 

 branches ascending. Leaves oblong, oblong-lan- 

 ceolate to oval, i / -3 / long, yx'-\%' wide, obtuse or 

 acutish at the apex, cordate-clasping, rounded, 

 truncate, or the upper narrowed at the base, very 

 short-petioled, or sessile, the primary venation 

 forming broad angles with the midvein; cymes 

 many-flowered, dense to loose; pedicels mostly not 

 longer than the flowers, bracteolate; calyx-segments 

 about the length of the corolla-tube, lanceolate, 

 acute; corolla-lobes nearly erect; follicles 2 / ~3^ / 

 long. 



In dry soil, or along streams, Ontario to British 

 Columbia, Ohio, Illinois and New Mexico. June-Aug. 



4. Apocynum pubescens R. Br. Velvet 

 Dogbane. (Fig. 2898.) 



Apocynum pubescens R. Br. Mem. Wern. Soc. 1: 68. 



1811. 

 Apocynum cannabinum var. pubescens A. DC. 



Prodr. 8: 44.0. 1844. 



"Whole plant, including the pedicels and calyx, 

 densely velvety -pubescent. Branches ascending; 

 leaves oval to elliptic, obtuse or acute at the apex, 

 strongly mucronate, obtuse or obtusish at the 

 base, the veins impressed in the pubescence of 

 the lower surface; petioles i // -2 // long; cymes 

 dense; calyx-segments about as long as the tube 

 of the corolla, lanceolate, acute; corolla appar- 

 ently purple, its lobes erect; fruit not seen. 



Original from "Virginia, herb. Mitchell." The 

 only specimen seen by us was collected by Dr. C. C. 

 Parry in Polk Co., Iowa, July, 1867. 



