1.2- Subfamily Alpinioideae + Overview Alpinioideae is the largest of the four subfamilies of Zingiberaceae and is widely distributed throughout the New and Old World tropics. Recent molecular studies have shown that, although Alpinioideae is a strongly supported monophyletic subfamily with two distinct tribes (Alpinieae and Riedelieae), large genera, such as Alpinia and Amomum, are polyphyletic and are in need of revision. + Tribes of the Subfamily Alpiniodeae The Subfamily Alpinioideae has 2 tribe, 21 genera - Tribe Alpinieae [17 genera] - Tribe Riedelieae [4 genera]