J.F.Macbr. 1917 - Macbride JF (1917) NOTES ON THE HYDROPHYLLACEAE AND A FEW OTHER NORTH AMERICAN SPERMATOPHYTES. Contributions From The Gray Herbarium of Harvard University 49: 23-59. Retrieved from http://www.jstor.org/stable/41763935
There is no corrections for Hydrophyllum fendleri var. albifrons yet.