Penstemon digitalis (Foxglove Beardtongue)

Plant Info
Also known as: Eastern Smooth Beardtongue
Genus:Penstemon
Family:Plantaginaceae (Plantain)
Life cycle:perennial
Origin:east-central US
Habitat:part shade, sun; average to moist; fields, open woods, roadsides
Bloom season:May - June
Plant height:2 to 5 feet
Wetland Indicator Status:GP: FACW MW: FAC NCNE: FAC
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

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Detailed Information

Flower: Flower shape: irregular Flower shape: tubular Cluster type: panicle

[photo of flowers] Long-stalked, ascending clusters arising from leaf axils in the upper plant, with 3 to several short-stalked flowers branching at the tip of each cluster. Flowers are about 1 inch long, white to pale pink or lavender, tubular with 5 rounded lobes. The lower lip has 3 lobes nearly equal in size; the upper lip has 2 lobes of equal size and slightly smaller than the lower lobes. Inside the tube are several pinkish or purplish lines, 4 black-tipped stamens hugging the upper part of the tube, a white style, and a sterile stamen with sparse yellow hairs at the tip end.

[photo of glandular hairs] The floral tube is abruptly inflated from the lower third. The calyx surrounding the flower is green to maroon and has 5 short, spreading, narrowly triangular lobes. Cluster stalks are 1 to 3 inches long and green to maroon. The flower, calyx and flower stalks are all densely covered in short, sticky, glandular hairs.

Leaves and stems: Leaf attachment: basal Leaf attachment: opposite Leaf type: simple

[photo of basal leaves] Basal and lowest stem leaves are somewhat variable, stalked, mostly toothless, mostly hairless, narrowly spatula shaped to oblong to narrowly egg-shaped, 4 to 6 inches long, up to 2½ inches wide, with a blunt or rounded tip, and often somewhat wavy around the edges.

[photo of stem leaves] Stem leaves are more lance-like to nearly triangular, pointed at the tip, thin, shiny, finely toothed around the edges, stalkless, somewhat clasping, and tend to be widely spaced with opposite pairs at right angles to the pair above and below. Stems are erect, single or multiple from the base, hairless except in the flower clusters.

Fruit: Fruit type: capsule/pod

Fruit is a teardrop-shaped capsule containing numerous brown, angled seeds.

Notes:

Foxglove Beardtongue is native to our south and east and the DNR is undecided whether it is native in Minnesota or not. In its native range it's found in meadows, prairies, woodland edges, savannas and along railroads. Herbarium collections in the state have primarily been from along roadsides, which may have been garden escapees and not native populations. It is available in the nursery trade and is sometimes found in restoration plantings. The flowers are similar to White Penstemon (Penstemon albidis) but the latter has much shorter flower stalks arising from the leaf axils and is generally a smaller plant, reaching heights of only 6 to 20 inches. Also similar is Pale Beardtongue (Penstemon pallidus), which has smaller flowers and hairy leaves and stems where Foxglove Beardtongue is hairless except for the flowers.

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More photos

Photos by K. Chayka taken at Wild River State Park, Chisago County. Photos courtesy Peter M. Dziuk taken in Houston County and in his gardens in Anoka and Ramsey counties.

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: Patrick - Lake Elmo, Washington County
on: 2016-06-15 07:37:53

There are 1000s of these plants in my 2 acre tall grass restoration. It is self propagating and prolific.

Posted by: Aaron - Redwood County
on: 2017-06-19 23:29:36

We had a few of these plants during a vegetation survey last week in a wetland that BWSR owns. I'm guessing it was in the seed mix, although it wasn't listed from the last seeding in 2009.

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