Deciduous or partly evergreen shrubs or woody climbers. Twigs rounded, slender; pith moderate, continuous, or excavated between the nodes. Buds solitary or superposed, sessile. Leaf-scars opposite, crescent-shaped, small, on the narrowed tips of leaf-bases, more or less connected by lines; bundle-traces 3; stipule-scars none.
Erect shrubs; buds often superposed
b. Pith brown, excavated between the nodes
b. Pith white, continuous
Twining or loosely ascending shrubs
b. Stems red-brown, hairy, nearly evergreen
b. Stems gray or straw-colored
c. More or less evergreen, at least southwards
1. L. tatarica L. Tartarian Honeysuckle. Erect smooth shrub 1. 5-3 m. high; branches slender, glabrous; pith brown, excavated between the nodes; buds glabrous, oblong or ovoid, the scales short-pointed. Introduced from Eurasia, frequently escaping from cultivation (Fig. 294).
Fig. 294. Lonicera tatarica.
Fig. 295. Lonicera canadensis.
Fig. 296. Lonicera japonica.
Fig. 297. Lonicera sempervirens.
Fig. 298. Lonicera dioica.
2. L. canadensis Bartr. American Fly Honeysuckle. A straggling shrub 1-1. 5 m. high; twigs glabrous; buds short-ovoid or nearly globose, glabrate, scales acute, the lower distinctly shorter than the bud. Cool woods, Quebec to Saskatchewan, south to North Carolina, Indiana and Iowa (Fig. 295).
3. L. japonica Thunb. Japanese Honeysuckle. A half-evergreen twining or trailing shrub with pubescent red-brown twigs; leaves ovate, 2-8 cm. long, entire. Introduced from Asia, much planted, especially along roadsides, now widely spreading and naturalized, often a very aggressive weed (Fig. 296).
4. L. sempervirens L. Trumpet Honeysuckle. High-climbing glabrous shrub, more or less evergreen; twigs gray or straw-colored; leaves elliptic, 3-8 cm. long, glaucous. Woods and thickets, Florida to Texas, north to Maine, Ohio, Iowa, and Nebraska, partly as an escape from cultivation northwards (Fig. 297).
5. L. dioica L. Smooth Honeysuckle. A slightly climbing or erect deciduous shrub, 1-3 m. high; bark grayish, peeling on old stems; twigs glaucous and glabrous; buds ovoid, the scales ovate, the lowest about as long as the buds. Rocky banks, Maine and Quebec to Manitoba and British Columbia, south to Georgia, Missouri, and Kansas (Fig. 298 ).