There are 15(Kanto only), but 76 in the National Dex of Unova.
Tangela, Exeggcute, Exeggutor, Bellsprout, Weepinbel, Victreebel, Oddish, Gloom, Vineploom, Bellossom, Paras, Parasect, Bulbasaur, Ivysaur and Venusaur are native to Kanto.
