70 A GUIDE TO THE WILD FLOWERS 



198. HOP. HUMULUS. 



Twining vines with very rough herbaceous stems and 

 deeply lobed, sharply toothed leaves. Flowers minute, green, 

 in clusters, some of them aromatic and resinous, followed 

 by the familiar hop. (Cannabinaceae.) The only species is the 

 Hop. Humulus Lupulus. Often 25 feet long, the stem covered 

 with stiff reflexed hairs. Leaves nearly round or oval in 

 outline, deeply 3-7 lobed. Nova Scotia to Manitoba, south 

 to N. Y. and Ga., west to Kan., Ariz. etc. Summer. Much 

 cultivated and often escaping but found also as a wild plant. 

 For a related plant see no. 305. 



199. CLIMBING HEMPWEED. MIKANIA. 



Herbaceous, smooth-stemmed vine, climbing often 5-12 

 feet, over bushes. Leaves deeply heart shaped at the base, 

 sharp-pointed at the tip. Flowers very numerous in compact 

 heads. (Compositae.) See No. 809. The only species is the 

 Climbing Hempweed. Mikania scandens. Leaves stalked. 

 Heads of flowers in compound clusters, at the ends of the 

 branches, whitish or pinkish. August. Me. to Ontario, Fla. 

 and Tex. Fig. 199. 



200. SAND VINE. G ON GLOBUS. 



High climbing, herbaceous vines, often hairy toward the 

 top. Leaves heart-shaped at the base. Flowers with a very 

 short tube, the lobes erect, or nearly so. Fruit a smooth pod, 

 the seeds tailed. (Asclcpiadaceac.) Our only species is the 

 Sand Vine. Gonolobus lacvis. Leaves broad at the base, 

 gradually tapering to the tip, the margins smooth-edged, 3-7 

 inches long. Flowers between the leaf-stalks, about ^ inch 

 long, whitish, followed by a pod 4-6 inches long. July. Pa. 

 to 111., Kan. and Tex. Fig. 200. A somewhat similar vine, 

 Cynanchum nigrum, with dark purple flowers, and smaller 

 pods is found from Mass. to Pa. and Ohio. It is a native of 

 Europe. See also no. 696. 



