Northern Prairie Wildlife Research Center
Foxglove Beardtongue (Penstemon digitalis)
- Family: Figwort (Scrophulariaceae)
- Flowering: May-July.
- Field Marks: Penstemons are recognized by their tubular flowers and 5 stamens, one of which is sterile and densely hairy.
- Habitat: Low woods, wet meadows, wet prairies, fallow fields, roadside ditches.
- Habit: Perennial herbs with thickened rootstocks.
- Stems: Erect, branched or unbranched, usually smooth, up to 4 feet tall.
- Leaves: Opposite, simple, lanceolate to elliptic, pointed at the tip, tapering to the base, with or without a few teeth, smooth, up to 7 inches long, up to 2 1/2 inches wide.
- Flowers: Several in terminal racemes, white, up to 1 1/2 inches long.
- Sepals: 5, green, free to the base.
- Petals: 5, white, 2-lipped, united into a tube with purple stripes inside, up to 1 1/2 inches long.
- Stamens: 5, one of which is sterile and densely hairy.
- Pistils: Ovary superior.
- Fruits: Capsules brown, smooth, up to 1/2 inch long.
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