Pennycress, Thlaspi arvense Family: Brassicaceae Pollen grain morphology: striate, tricolporate, spheroidal Pollen grain size: 20.04 ± 0.89 µm by 18.19 ± 0.23 µm May 1, 2015brassicaceae, Uncategorizedarvense, brassicaceae, pennycress, spheroidal, striate, thlaspi, tricolporate