The native orchids of the United States and Canada excluding Florida

Author(s): 
Year: 
1975
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361 pgs. ISBN 0893270156
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Notes: 
exhaustive treatise of the species and varieties of orchids native to North America north of Mexico and Florida, including copious line drawings and photographs of every taxon; and complete keys, descriptions, and distribution maps. Of great interest to lay readers and professionals. Available through the Scientific Publications Department of the New York Botanical Garden.