Robert T. Clausen

A botanical study of the yam bean...

A botanical study of the yam beans (Pachyrrhizus)

Year unknown

A monograph of the Ophioglossaceae

A monograph of the Ophioglossaceae

Year unknown

A new species of Najas from the H...

A new species of Najas from the Hudson River

Year unknown

Biennial species of Sedum of the ...

Biennial species of Sedum of the Sierra Madre Occidental and Mexican Plateau

Year unknown

Carex aestivalis and Carex lurida...

Carex aestivalis and Carex lurida var. gracilis on the glaciated Allegheny plateau

Year unknown

Contributions to the flora of New...

Contributions to the flora of New Jersey

Year unknown

Hybrids of the eastern North Amer...

Hybrids of the eastern North American subspecies of Lycopodium complanatum and L. tristachyum

Year unknown

Najas arguta in Central America a...

Najas arguta in Central America and its Relationship to N. wrightiana

Year unknown

Nomenclatural changes and innovat...

Nomenclatural changes and innovations in the Crassulaceae

Year unknown

Northeastern limits of the known ...

Northeastern limits of the known range of Rhus toxicodendren

Year unknown

On the status of Botrychium disse...

On the status of Botrychium dissectum var. oneidense

Year unknown

Ophioglossum petiolatum Hooker

Ophioglossum petiolatum Hooker

Year unknown

Plants of central Pennsylvania

Plants of central Pennsylvania

Year unknown

Sagittaria Edwardsiana, a new spe...

Sagittaria Edwardsiana, a new species from the New Jersey pine barrens

Year unknown

Sedum

Sedum

Year unknown

Selaginella, subgenus Euselaginel...

Selaginella, subgenus Euselaginella in the Southeastern United States

Year unknown

Some plants of New York

Some plants of New York

Year unknown

Studies in the Crassulaceae

Studies in the Crassulaceae

Year unknown

Studies in the Gentianaceae

Studies in the Gentianaceae

Year unknown

Studies in the Ophioglossaceae

Studies in the Ophioglossaceae

Year unknown

Symposium on Botanical exploratio...

Symposium on Botanical exploration in New York State

Year unknown Clark T. Rogerson, G. J. Schumacher, Edwin H. Ketchledge, Robert T. Clausen, William Campbell Steere, University of the State of New York, and New York State Museum and Science Service

The section Sedastrum of Sedum

The section Sedastrum of Sedum

Year unknown

The taxonomy and crytology of the...

The taxonomy and crytology of the subgenus Gormania of Sedum

Year unknown Robert T. Clausen and Charles H. Uhl

Variation of species of Sedum of ...

Variation of species of Sedum of the Mexican Cordilleran Plateau

Year unknown

Variations in the chemical compos...

Variations in the chemical composition and insectidical properties of the yam bean (Pachyrrhizus)

Year unknown R. Hansberry, Robert T. Clausen, and L. B. Norton

Variations of Ophioglossum vulgatum

Variations of Ophioglossum vulgatum

Year unknown

Woodsia oregana on Sentinel Butte...

Woodsia oregana on Sentinel Butte, North Dakota

Year unknown