Prionosciadium nelsonii is a plant species known from the Mexican states of Chiapas and Morelos.Coulter, John Merle, & Rose, Joseph Nelson. Proceedings of the Washington Academy of Sciences 1: 149–150. 1900.Breedlove, D.E. 1986. Flora de Chiapas. Listados Florísticos de México 4: i–v, 1–246. It is a biennial herb with a large taproot. Leaves are compound with narrowly lanceolate leaflets, some of them with narrow, tapering lobes. The inflorescence is a compound umbel at the top of the stem.Wolff, Karl Friedrich August Hermann. Repertorium Specierum Novarum Regni Vegetabilis 9(222/226): 421. 1911.Davidse, G., M. Sousa Sánchez, S. Knapp & F. Chiang Cabrera. 2009. Cucurbitaceae a Polemoniaceae. 4(1): i–xvi, 1–855. In G. Davidse, M. Sousa Sánchez, S. Knapp & F. Chiang Cabrera (eds.) Flora Mesoamericana. Universidad Nacional Autónoma de México, México D.F.Field Museum, Amostras de Herbário de Neotrópica
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External links photo of herbarium specimen at Missouri Botanical Garden, collected in Morelos, syntype of Prionosciadium nelsonii, sheet 1 of 2 w stem + flowers photo of herbarium specimen at Missouri Botanical Garden, collected in Morelos, syntype of Prionosciadium nelsonii, sheet 2 of 2 w fruits + basal leaf