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Penstemon digitalis Nutt. ex Sims

Foxglove beardtongue, talus slope penstemon, white beardtongue

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassAsteridaeA large class that encompasses asters
OrderLamialesAromatic herbs and shrubs, including lavender, lilac, olive, jasmine, ash, teak, snapdragon, sesame, psyllium, garden sage, mint, basil, and rosemary
FamilyPlantaginaceaePlantains
GenusPenstemon“Beard-tongues,” a reference to flower shape
SpeciesdigitalisFrom the Latin for finger, because of the corolla shape

About plant names...

Foxglove beardtongue is a widespread perennial in eastern North America. It prefers fields, roadsides, and open woods, and average to damp soils.

Plants: 2-3′ (60-91 cm) high, with one or more erect stems that are green to purple.

Leaves: Lower leaves are mostly smooth-edged, and 1-7″ (2.5-17 cm) long and 1½″ (3.8 cm) wide. Upper leaves are more lanceolate or elliptic in shape, with pointed tips. They are sessile, and opposite. They may have smooth edges or minute teeth.

Flowers: Stalks contain six opposite pairs of flower clusters, each with 3-12 flowers, each about 1″ (2.5 cm) long. Cluster stalks are 1-3″ (2.5-7.6 cm) in length, and green grading to deep red. Flowers are pale blue, lavendar, pink, or white, with 5 petals, appearing from May to June. Flowers and stalks are densely hairy.

Fruits: Dry capsules, ¼-⅜″ (9-12 mm).

Online References:

Minnesota Wildflowers

Gobotany.nativeplanttrust.org

The Missouri Botanical Garden

Wikipedia

Penstemon digitalis (foxglove beardtongue, talus slope penstemon, white beardtongue)

6/15/2010 · Garden in the Woods, Framingham, Mass­a­chu­setts · ≈ 5 × 8″ (13 × 19 cm)

Penstemon laevigatus Aiton var. angulatus Benn.

Penstemon laevigatus Aiton ssp. digitalis (Nutt. ex Sims) Benn.

 

Penstemon digitalis description by Thomas H. Kent, last updated 9 Aug 2023.

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Penstemon digitalis (foxglove beardtongue, talus slope penstemon, white beardtongue)

6/15/2010 · Garden in the Woods, Framingham, Mass­a­chu­setts · ≈ 14 × 9″ (35 × 23 cm)

Penstemon digitalis (foxglove beardtongue, talus slope penstemon, white beardtongue)

6/15/2010 · Garden in the Woods, Framingham, Mass­a­chu­setts · ≈ 14 × 9″ (35 × 23 cm)

Range: Zones 3-8:

About this map...