List and Description of Named Cultivars in the Genus Penstemon
This 106-page booklet is a joint publication of the American Penstemon Society and the University of Nebraska–Lincoln Extension. The author is Dale Lindgren, emeritus professor of horticulture at the West Central Research and Extension Center. This edition contains the names, descriptions, and parentage information of more than 900 Penstemon varieties, based on the most reliable sources available. This publication is available on UNL Marketplace. Price: $5.00
