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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
- Penstemon Flowers American Penstemon Society Sarah Kimball Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721
- Bluestem Penstemon Detailing the Wavy Leaf Bases
- Report of the Intermountain Native Plants Cooperative
- 2015 Fall Newsletter
- USDA Plant Guide (Pdf)
- Spring Flowers Are Finally Finding It Safe to Break out of Their Buds and Show Us Their Sweet Little Faces
- The Californian Penstemons
- A New Species of Penstemon (Scrophulariaceae) from the Uinta Basin, Utah
- Northwest Native Plant Journal a Monthly Web Magazine (Formerly NW Native Plant Newsletter)
- 2013 September Newsletter
- Phylogenetics of a Rapid, Continental Radiation: Diversification, Biogeography, And
- Suggested Plant Guide
- Penstemon, Beardtongue
- Hotrock Penstemon Plant Guide
- WHATEVER HAPPENED to the SCROPHULARIACEAE? by Richard G
- Keckiella Cordifolia (Benth.) Straw, HEART-LEAVED PENSTEMON, SCARLET-HONEYSUCKLE, HONEYSUCKLE PENSTEMON
- Rare Plant R E
- 1 Key to Penstemons North
- EC92-1246-D List and Description of Named Cultivars in the Genus Penstemon Dale T
- 2003 Volume 62 Issue 1
- Penstemon Degeneri Crosswhite (Degener's Beardtongue)
- Penstemons Are for Great Basin Gardens
- Eaton's Penstemon
- Champoeg Nursery Complete Plant List
- Idaho Penstemon) on the Twin Falls Ranger District, Sawtooth National Forest, Idaho
- Flowering Plants
- The Penstemon Issue
- Gardensmart Oregon Guide to Non-Invasive Plants Lists
- Boise National Forest
- Palmer's Penstemon, Penstemon Palmeri, Plant Guide
- Penstemon Cyaneus Pennell
- Evaluating Native Herbaceous Flowering Plants Versus Native Cultivars for Pollinator Habitat Restoration Annie White University of Vermont
- Penstemons, Selected Species Family: Scrophulariaceae Tall White Or Foxglove Beard-Tongue, P
- Key to the Penstemons of the Siskiyou Mountains
- Pair-Flowered Cymes in the Lamiales: Structure, Distribution and Origin