D307-2016 Tacca integrifolia, the white batflower, is a species of flowering plant in the yam family Dioscoreaceae.
As nearly as I can tell, the white parts are not the actual flower, but spaths or sepals. The flowers are the small, dark purple growths in clusters at the bases of the white growths.
Matthaei Botanical Gardens
Taken November 3, 2016
From Tropical and Temperate Plants Through the Year