Flora of Colorado by Jennifer Ackerfield
Penstemon of Southeastern Colorado by Don and Donnie Barnett
Flora of the Four Corners Region by Heil, O'Kane Jr, Reeves, and Clifford
Penstemons: The Beautiful Beardtongues of New Mexico by Heflin, et al
Flora Neomexicana by Allred and Jercinovic
The Heart of Penstemon Country: A Natural History of Penstemons in the Utah Region by Stevens, et al
Northwest Penstemons: 80 Species of Penstemon Native to the Pacific Northwest
by Dee Strickler and Anne Morley
[Cost: $18.50 including postage. To get a copy of the book, use this form https://drive.google.com/file/d/1B6LK6PNCC0ov9zfdx35np-_oJJt95l9b/view]
Please add more in the comments!
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Key to the Genus Penstemon and its related Genera in the Tribe Cheloneae (Scrophulariaceae); Robin and Kenneth Lodewick, 1999.
@je9h thanks! Also, available digitally at https://penstemons.org/images/documents/Lodewick_Penstemon_Key.pdf
Elliott
I looked at my wife's botanical library and noticed Penstemons by Robert Nold, the photos by Panayoti Kelaidis are useful. It is written for a rock garden audience but would be useful to a naturalist. We also had a copy of Northwest Penstemons - I didn't realize we had it! An excellent book as I mainly roam in the Pacific Northwest.
Thanks for the other resources, especially the key. Appreciate your help in confirming many of my Penstemon IDs.
Regards John Brew aka brewbooks
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