1. Genetic variation among populations of the rare clustered lady-slipper orchid (Cypripedium fasciculatum) from Washington State, USA;Aagaard;Nat. Area J.,1999
2. Tansley Review No. 110. Numerical and physical properties of orchid seeds and their biological implications;Arditti;New Phytol.,2000
3. Conservation Genetics: Case Histories from Nature;Avise,1996
4. Genetic and evolutionary consequences of small population size in plants: implications for conservation;Barrett,1991
5. Genetic variation in Massachusetts populations of Cypripedium arietinum R. Brown in Ait. And C. Acaule Ait. (Orchidaceae);Bornbusch;Rhodora,1994