There are several sources of the seedlessness trait, and essentially all commercial cultivators get it from one of three sources: Thompson Seedless, Russian Seedless, and Black Monukka, all being cultivars of Vitis vinifera. There are currently more than a dozen varieties of seedless grapes. Several, such as Einset Seedless, Benjamin Gunnels's Prime seedless grapes, Reliance, and Venus, have been specifically cultivated for hardiness and quality in the relatively cold climates of northeastern United States and southern Ontario. COUNT 5
QSN1 How many seedless grape sources are there for commercial cultivators?  ANS1 three QSN2 How many varieties of seedless grapes are there?  ANS2 more than a dozen QSN3 What species of grape are grown by Thompson Seedless?  ANS3 Vitis vinifera QSN4 What type of climate are Benjamin Gunnels's Prime seedless grapes specifically cultivated for?  ANS4 cold QSN5 What species of grape are grown by Black Monukka? ANS5 Vitis vinifera