Ozark Sundrops, Oenothera macrocarpa Family: Onagraceae Pollen Grain Morphology: Strongly protruding pores, triporate, viscid hairs in fresh specimens Pollen Grain Size: (polar) 237.7 µm by 210 µm January 20, 2015Onagraceae, Uncategorizedlarge pollen grains, Oenothera, Oenothera macrocarpa, Onagraceae, Ozark sundrop, triporate