102 NORTHERN LIMIT OF WILD GRAPE VINES—LAWSON. 
west to Arkansas, has a globose depressed berry, size of a pea, 
blackish when ripe. 
V. indivisa grows in the swamps of the Southern States, west 
to Louisiana and Arkansas, bearing a very small, usually one- 
seeded berry. 
V. cestivalis, the Summer Grape, grows from Connecticut to 
Florida and west to Arkansas, ripening its blue, pleasantly- 
flavoured berries in October ; original of the Clinton Grape. 
V. vulpina, or Fox Grape of the South, grows in Virginia, 
Florida, and intervening States. 
V. incisa is a Prairie Plant confined apparently to Texas and 
Arkansas, and has black shining berries the size of a small pea. 
V. cordifolia and V. riparia, which are more northern in 
their range, have acid fruit, which sweetens after having been 
touched by frost, hence they are commonly called Winter Grapes 
to distinguish them from V. ewstivalis, the fruit of which be- 
comes sweet as it ripens in the sun. V. riparia is said to be 
the original of the Delaware and Taylor-Bullet grapes. 
V. Labrusca, is one of the best known species which has very 
large leaves, and is familiar to us in its garden forms as the 
Isabella, Catawba, and several other well-known American 
grapes. Varieties of this species are distinguished by the hairi- 
ness or woolly character of the very large leaf, and comparatively 
large berries. 
CANADIAN SPECIES, 
Only three species of Vitis extend into Canada, viz., Labrusca, 
cordifolia and riparia. 
V. Labrusca; leaves (thick 5-7 inches) broadly cordate angu- 
lar, more or less lobed, the sinuses obtuse or rounded, the Tee 
surface tomentose ; berries, large globose. 
V. cordifolia ; bee (thin, 3-6 in.) cordate acuminate, toothed, 
smooth (except on the veins), berries small. 
V. riparia; leaves (thin 4-6 inches) more or less deeply 
divided into three lobes and incisely toothed ; smooth, except on 
the petioles, veins and margins, which are pubescent; berries 
small. 
