Common Comfrey, Symphytum officionale Family: Boraginaceae Pollen Grain Morphology: Heterocolpate (pseduocolpi) Pollen Grain Size: 21.5 + 0.1 µm by 18.8 + 0.03 µm February 4, 2015Boraginaceae, UncategorizedBoraginaceae, Common Comfrey, heterocolpate, pseudocolpi, Symphytum, Symphytum offionale