Penstemons

Penstemons (Gardener's Guide to Growing Series)

Peter James, David Way

Botanical notes

by George Vasey

Wyoming's threatened and endangered plant species: blowout penstemon

B. Heidel ... [et al]

Studies in Penstemon

by David D. Keck

Penstemons

David Way

Antirrhinums and Pentstemons

Albert James Macself

The effects of fire on Lemhi penstemon (Penstemon lemhiensis): final monitoring report, 1995-2000

[prepared by Bonnie Heidel and J. Stephen Shelly]

Growing penstemons: species, cultivars, and hybrids

American Penstemon Society ; compiled by Dale Lindgren and Ellen Wilde.

Penstemons: the beautiful beardtongues of New Mexico

Jean Heflin ; photography by Bill Heflin ; drawings by DeWitt Ivey.

The sensational new buddleia "Royal Red", Pentstemon "Firebird" / Totty's

Charles H. Totty (Firm)