1. Alphonso , A. G. 1975 The role of the botanic gardens in the conservation of orchid species 323 325 K. Senghas Proceedings of the eighth world orchid conference
2. Spatial and genetic structure of two sandhills oaks: Quercus laevis and Quercua margaretta (Fagaceae);Berg;American Journal of Botany,1994
3. Borromeo , C. R. 1975 The urgent need for the conservation of Philippine orchid species 341 342 K. Senghas Proceedings of the eighth world orchid conference
4. Status and population fluctuations of the eastern prairie fringed orchid [Platanthera leucophaea (Nutt.) Lindl] in Illinois;Bowles;Erigenia,1992
5. Mate availability in small populations of plant species with homomorphic sprophytic self-incompatibility;Byers;Heredity,1992