Eastern prickly pear, Opuntia humifusa Family: Cactaceae Pollen grain morphology: octagonal, periporate, baculate, fenestrate Pollen grain size: 101.79 + 1.05 µm by 99.15 + 1.57 µm April 30, 2015cactaceae, Uncategorizedbaculate, cactaceae, fenestrate, humifusa, octagonal, opuntia, periporate, prickly pear