Books by Robert T. Clausen
Variation of species of Sedum
Variation of species of Sedum of the Mexican Cordilleran Plateau
Biennial species of Sedum of t
Biennial species of Sedum of the Sierra Madre Occidental and Mexican Plateau
Symposium on Botanical explora
Symposium on Botanical exploration in New York State
Najas arguta in Central Americ
Najas arguta in Central America and its Relationship to N. wrightiana
A botanical study of the yam b
A botanical study of the yam beans (Pachyrrhizus)
Hybrids of the eastern North A
Hybrids of the eastern North American subspecies of Lycopodium complanatum and L. tristachyum
On the status of Botrychium di
On the status of Botrychium dissectum var. oneidense
Carex aestivalis and Carex lur
Carex aestivalis and Carex lurida var. gracilis on the glaciated Allegheny plateau
The section Sedastrum of Sedum
The section Sedastrum of Sedum
Northeastern limits of the kno
Northeastern limits of the known range of Rhus toxicodendren
Studies in the Gentianaceae
Studies in the Gentianaceae
Studies in the Crassulaceae
Studies in the Crassulaceae
Contributions to the flora of
Contributions to the flora of New Jersey
Variations of Ophioglossum vul
Variations of Ophioglossum vulgatum
A monograph of the Ophioglossa
A monograph of the Ophioglossaceae
Ophioglossum petiolatum Hooker
Ophioglossum petiolatum Hooker
A new species of Najas from th
A new species of Najas from the Hudson River