lycophytes
- Architecture and environmental response in seven rhizomatous species of Lycopodium. 1991
- Clubmoss, Ferns, Polytricum, Bullfrogs and Guntram Tower. 2000
- Five species of Lycopodium in the Harvard Forest. 1978
- General Investigation of the Five Species of Lycopodium. 1975
- Growth behavior of five species of Lycopodium in central Massachusetts. 1971
- Growth patterns of five species of Lycopodium. 1973
- Harvard Forest Flora Survey. 2005-2008
- A study of variation and intergradation in Lycopodium obscurum. 1984