A comparison of numerical and biosystematic studies in Haplopappus R. C. JacksonT. J. Crovello OriginalPaper Pages: 54 - 70
Artificial and natural hybrids in pycnanthemum (Labiatae) Henrietta L. ChambersKenton L. Chambers OriginalPaper Pages: 71 - 88
The process of evolutionary migration in species of Selaginella Rolla Tryon OriginalPaper Pages: 89 - 100