Penstemon
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- Aquilegia 2019 Spring Volume 43-2
- May 2012 ---International Rock Gardener--- May 2012
- ROYAL PENSTEMON Penstemon Speciosus Douglas Ex Lindl
- Native Seed Collection Project Boise National Forest
- Penstemon Bleaklyi (Plantaginaceae), a New High-Elevation Species from North-Central New Mexico
- VENUS PENSTEMON Leaves Stay Green Throughout the Growing Season Providing Some Forage Value
- Penstemon Barbatus Pinacolada Series
- Introduction and Objectives
- Systematics of Penstemon Section Ericopsis (Plantaginaceae), a Group of Plant Species Native to the Intermountain West
- 1992 Volume 51 Issue 1
- Identifying Local Penstemons
- Descriptive Key to Oregon Penstemons
- Penstemons Are for Great Basin Gardens
- Colorado Native Plant Society (Conps)
- Plant Fact Sheet for Taper-Leaved Penstemon
- Perennial Word July 2015
- Pair-Flowered Cymes in the Lamiales
- CUTLEAF BEARDTONGUE Scientific Name: Penstemon Dissectus Elliott