by Robert T. Clausen
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Variation of species of Sedum of the Mex...
Biennial species of Sedum of the Sierra ...
Najas arguta in Central America and its ...
Northeastern limits of the known range o...
Hybrids of the eastern North American su...
A botanical study of the yam beans (Pach...
Status review of Botrychium minganense, ...
The gametophyte of Botrychium virginianu...
Survey for Botrychium paradoxum in the v...
Demographic monitoring of three species ...
The shoot of Botrychium interpreted as a...
Botrychiorum monographia