Description of Native Vines 
53. Twin-flower. (Linnza borealis.) 
LEAF: 1’, simple, opposite, entire or obscurely round-toothed 
or wavy-edged, roundish or oval, evergreen, somewhat hairy. 
FLOWER: rose or purple to whitish, fragrant, pendent in pairs on 
long stem (¢orolla rather bell-shaped, 5-lobed, hairy inside, sta- 
mens 4); June. South to New Jersey and in mountains to 
Maryland, and west; herbaceous, trailing. (Pl. V.) 
54. Moneywort. Creeping-Charlie. (Lysimachia nummu- 
laria, ) 
LeEaF : 1, simple, opposite, entire, roundish, smooth, short- 
stemmed, base often slightly cordate. FLOWER: yellow, large 
(1' across), single (corolla deeply 5-lobed, spreading, lobes al- 
most roundish, stamens 5); July-September. Introduced, becom- 
ing spontaneous; trailing, herbaceous. (Pl. V.) 
55. Enslenia. (E. albida.) 
LEAF: 3-5 broad, simple, opposite, entire, ovate, base cor- 
date, apex sharp, long-stemmed. FLOWER: whitish, small (co- 
rolla 5-parted, lobes erect), in lengthened clusters; July—Sep- 
tember. Ohio to Illinois, and south; river-banks; twining, 
herbaceous ; milky juice. 
56. Black Vincetoxicum. Black Milkweed. (V. nigrum.) 
LEAF: 2’, simple, opposite, entire, ovate or oblong-ovate. 
FLOWER: dark purple, small (corolla 5-parted, lobes spreading, 
stamens 5, anthers adhering to stigma, a 5-10-lobed flat, fleshy 
disk in centre), clustered. New England to Pennsylvania; more 
or less twining, herbaceous, milky juice. 
57. Rough-fruited Milkweed. (Gonolobus obliquus.) 
LEAF: 3-8’, simple, opposite, entire, heart-shaped, apex sharp, 
stem and stalk guite hairy. FLOWER: greenish outside, crim- 
son-purple inside (corolla 5-parted, spreading, 1’ across, or less, 
lobes narrow), many-clustered ; July-September; pod 5’ long, 
rough-pointed. Pennsylvania, south and west, near streams; 
twining or trailing, herbaceous, milky juice. 
329 
