8o The Ohio Naturalist. [Vol. XIII, No. 4, 



4. Leaves and cymes smooth or very slightly pubescent. 5. 



4. Leaves and cymes very densely pubescent. A. pnhescens. 



5. Leaves lanceolate to obovate, 2 to 4 times as long as wide; terminal 



cyme larger than the axillary; flowers greenish. A. cannabinuyn. 

 5. Leaves rather small lanceolate 4 to 6 times as long as wide; flowers 

 white. A. album. 



1. Apocynum androsaemifolium L. vSpreading Dogbane. 

 Dichotomously branched stems 1 to 5 feet high; root stalk hori- 

 zontal, leaves ovate to obovate, usually twice as long as wide, 

 glabrous and dark green above, more or less pubescent and light 

 green beneath, short petioled with inucronate apex, and a broad 

 base; cymes both terminal and axillary with short pediciled, 

 campanulate, pink, sympetalous flowers with reflexed corolla 

 segments. Common in fields and thickets. General. 



2. Apocynum urceolifer Mill. Urnflowered Dogbane. Slen- 

 der stems about 3 feet high with widely spreading branches; 

 c^mies small with white or slightly pink tinged flowers and spread- 

 ing, pointed corolla segments; calyx segments lanceolate; leaves 

 oblong, mucronate, slightly pubescent beneath. Along roadsides 

 and fields. Auglaize County. 



3. Apocynum cannabinum L. Indian Hemp. Stems 3 to 5 

 feet high with erect or ascending branches and long verticle roots ; 

 leaves lanceolate to oblanceolate, apex mucronate, base of upper 

 ones acute while the lower ones are often rounded, short petioled, 

 4 to 5 inches long, :?<4 to 1^ inches wide, glabrous above, sometimes 

 pubescent beneath, cymes dense, short pediceled, with bracts at 

 the base and greenish white flowers. Common in fields and 

 waste places. General. 



4. Apocynum album Greene. River-bank Dogbane. Glab- 

 rous stems with lanceolate, smooth, petioled, acute leaves 4 to 6 

 times as long as wide; cymes dense with small white flowers. 

 River banks and moist fields. Coshocton, Lake, Butler, Mercer, 

 Montgomery, Clcnnont, Holmes. 



5. Apocynum hypericifolium Ait. Clasping-leaf Dogbane. 

 Stems glabrous often glaucous, 1 to 2 feet high with ascending 

 branches, leaves oblong to oblanceolate, upper ones ver}^ short 

 petioled or sessile, lower ones clasping; cymes dense, bracted, 

 with pedicles about as long as the flowers ; calyx segments lanceolate 

 acute. In dry soil, especially in sandy places. Erie, Ashtabula. 



6. Apocynum pubescens R. Br. Velvet Dogbane. Entire 

 plant densely \'cl\-et}' puljescent; ascending branches with ovate 

 to oblong, mucronate leaves often twice as long as wide and obtuse 

 at the base; venation strongly impressed in the velvety under 

 surface; calyx segments lanceolate, acute; corolla purple, lobes 

 erect. In waste places and flood planes near streams. Franklin, 

 Auglaize, Harrison, Adams. 



Date of Publication, February 20, 1913. 



