Common yarrow, Achillea millefolium Family: Asteracae Pollen grain morphology: echinate, tricolpate Pollen grain size: 24.46 + 1.32 µm by 21.98 + 0.87 µm April 29, 2015Asteraceae, Uncategorizedachillea, asteracae, echinate, milfoil, millefolium, tricolpate, yarrow