From Plant Press, Vol. 19, No. 3, July 2016.
At the 2016 Smithsonian Botanical Symposium, speaker Sam Droege (U.S. Geological Survey) talked about pollen specialist bees which have evolved obligate associations with flowering host plant genera. Oenothera is a recurrent host plant genus associated with specialist bee species in the United States. Oenothera macrocarpa is a known host plant for the sweat bee, Lasioglossum oenotherae. Alice Tangerini illustrated O. macrocarpa for a T-shirt design for the Botany 2011 conference in St. Louis, Missouri. The type locality for this species is along bluffs along Meramec River near the Shaw Nature Reserve of the Missouri Botanical Garden. This species was selected for the shirt since the meetings were in St. Louis, and Missouri Botanical Garden director Peter Raven and his students worked on Onagraceae. The drawing began as a pen and ink illustration based on US herbarium specimens and field photographs. Digital color was added for the shirt logo.