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Penstemon angustifolius

Family: plantaginaceae
Common name(s): narrow-leaf beardtongue
Hardiness ratings: USDA zone 3~4 - 7

General resources

• Wikipedia. Online encyclopedia entry (if defined).
• Google images. Web search for photographs.
• The Plant List. Taxonomical lookup
• Catalogue of Life. Taxonomical lookup

Links for Penstemon angustifolius

• American Penstemon Society - Detailed description of the species' botanical characteristics, habitat, and native range. (1 photo)
• Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 3-7)
• Denver Botanic Gardens - Description, native range, and cultural requirements. (zone 4) (8 photos)
• Garden.org - Community-assembled plant profile (4 photos)
• Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (1 photo)
• NARGS Image Gallery - Photograph(s) contributed by North American Rock Garden Society members. (2 photos)
• Ontario Rock Garden Society - Germination information
• Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records.
• Southwest Colorado Wildflowers - Photos and botanical information about the species/genus. (9 photos)

Penstemon angustifolius var. caudatus

Common name(s): Broadbeard Beardtongue
Hardiness ratings: USDA zone 5

Links

• Denver Botanic Gardens - Description, native range, and cultural requirements. (zone 5) (1 photo)
• Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (17 photos)