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Meadowfoam (cultivar Mermaid) is an entomophilous winter annual oilseed crop that has historically produced an average of only two of five seeds per flower. Reference to inadequate meadowfoam pollination exists in the litera-ture, but quantitative evidence is lacking. Studies were undertaken to: 1) quantify meadowfoam pollination require-ments and 2) evaluate the potential of an alternative pol-linator. In vivo pollination biology studies tested pollen age, stigma age, stylar restriction, and pollen deposition rate effects on seed set. Yield efficacy of Osmia lignaria propinqua Cresson, a native wild bee pollinator, was com-pared in cages to a honey bee standard and a non-caged honey bee control. Osmia reproductive potential was also tested. Pollen 0-5 days old (postanthesis), stored at 3, 18, or 37°C, did not appear to limit seed set. Stigma ag