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. pubescens. 
5. Leaves lanceolate to obovate, 2 to 4 times as long as wide; terminal 
cyme larger than the axillary; flowers greenish. A. cannabinum. 
5. Leaves rather small lanceolate 4 to 6 times as long as wide; flowers 
white. A. album. 
1. Apocynum androsaemifolium L. Spreading 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 mucronate 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; 
cymes 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, to \ l A 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, Clermont, 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 very 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 velvety pubescent; 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. 
