BioStor
 | XXXVII.—Observations on raphides and other crystals in plants George Gulliver (1865) Annals And Magazine of Natural History 16: 331-333 |
 | The Mississippi River bluffs at Columbus and Hickman, Kentucky, and their fossil flora Edward W Berry (1915) Proceedings of The United States National Museum 48: 293-303 |
 | The Bases of Angiosperm Phylogeny: Vegetative Anatomy William C Dickison (1975) Annals of the Missouri Botanical Garden 62: 590-620 |
 | 1St Flowering Dates For Spring blooming Plants Of The Washington, Dc, Area For The Years 1970 To 1983 S G Shetler and S K Wiser (1987) Proceedings of The Biological Society of Washington 100: 993-1017 |
 | A Combined Cladistic Analysis of Angiosperms Using rbcL and Non-Molecular Data Sets Owi I Nandi, Mark W Chase and Peter K Endress (1998) Annals of the Missouri Botanical Garden 85(1): 137-214 |
 | Isoetes mattaponica (Isoetaceae), a new diploid Quillwort from freshwater tidal marshes of Virginia R D Bray, L J Musselman and W C Taylor (2001) Novon 11: 200-204 |