. . . . . . . . . "Pontia protodice" . . "Xanthisma spinulosum" . . "ellen hildebrandt. 2017. Pontia protodice nectar plant Xanthisma spinulosum. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/6820697> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .