Common sunflower, Helianthus annuus Family: Asteracae Pollen grain morphology: spheroidal, tricolporate, echinate, tectate Pollen grain size: 31.34 + 0.41 µm by 29.99 + 0.94 µm April 29, 2015Asteraceae, Uncategorizedannuus, asteracae, echinate, helianthus, spheroidal, sunflower, tectate, tricolpate