Penstemon Resources | P Resources | Plants Resources |

American Penstemon Society - "Offers information about membership, library, publications, events, taxonomy, and illustrated identification characteristics."

Dave's Garden PlantFiles: Genus Penstemon - Index page with links to all species and varieties of penstemon listed in the PlantFiles database of member-provided plant information and photos.

Kemper: Penstemon digitalis - "Plant portrait of foxglove beardtongue with cultural information, photos, and noteworthy characteristics."

Las Pilitas: California Penstemons - "Two pages with pictures, brief descriptions, and cultural requirements of penstemons native to California, for dry-area and moist-area species."

Paghat's Garden: 'Bashful' Beard-tongue - "One of a series of plant portrait pages documenting penstemons in this Pacific Northwest garden. Varieties featured are 'Bashful', 'Prairie Dusk', 'Midnight Blue', 'Ruby', 'Apple Blossom', 'Sour Grapes', and 'Garnet'."

Penstemania - Based on Penstemon growing and the Western Algarve.

The Penstemon Website - "Enthusiast's collection of links, information (both for gardeners and botanists), and photographs of penstemon species and varieties."

The Penstemons: Seed Germination Methodology - "Two pages in Tom Clothier's plant germination database dedicated exclusively to penstemon species, which are often finnicky and require a wide variety of germination conditions."