- IPNI Life Sciences Identifier (LSID)
- Transactions of the Kansas Academy of Science. Topeka, KS
- Family as entered in IPNI
No direct or indirect reference to the basionym; J. H. Carruth provided a diagnosis for P. ioensis and distinguished it from P. coronaria; P. ioensis has been presumed to be a comb. nov. (cf. Nieuwland, Amer. Midl. Naturalist 4(4): 176. 1915); St. Louis Code Art. 33.2 applies.