Penstemania -- http://www.penstemania.co.uk/
Based on Penstemon growing and the Western Algarve.
Dave's Garden PlantFiles: Genus Penstemon -- http://davesgarden.com/pf/b/scrophulariaceae/penstemon/
Index page with links to all species and varieties of penstemon listed in the PlantFiles database of member-provided plant information and photos.
Paghat's Garden: 'Bashful' Beard-tongue -- http://www.paghat.com/penstemonbashful.html
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'.
Kemper: Penstemon digitalis -- http://www.mobot.org/gardeninghelp/plantfinder/plant.asp?code=g590
Plant portrait of foxglove beardtongue with cultural information, photos, and noteworthy characteristics.
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