N. H. Russell

• Experiments in syllable recognition
• Flowering dates of Viola sororia Willd. and V. pensylvanica Michx. at different latitudes
• Local Introgression Between Viola Cucullata Ait. and V. Setpentrionalis Greene
• Morphological Variation in Viola rotundifolia Michx
• Morphological Variation in Viola selkirkii Pursh
• Regional Variation Patterns in the Stemless White Violets
• Techniques for Species Comparison in Violets
• The Taxonomy of the North American Acaulescent White Violets
• Three Field Studies of Hybridization in the Stemless White Violets