Northern Prairie Wildlife Research Center
Slender Mountain Mint (Pycnanthemum tenuifolium)
- Family: Mint (Lamiaceae)
- Flowering: June-September.
- Field Marks: This mountain mint has narrow leaves up to 1/6 inch broad and smooth stems.
- Habitat: Wet meadows, along streams, more often in drier habitats.
- Habit: Perennial herbs with slender rhizomes.
- Stems: Erect, branched, 4-sided, smooth, up to 4 feet tall.
- Leaves: Opposite, simple, linear, pointed at the tip, tapering to the base, without teeth, smooth, up to 2 1/4 inches long, 1/6 inch broad.
- Flowers: Several in usually flat-topped clusters, each flower 1/8-1/6 inch long.
- Sepals: 5, united below, green.
- Petals: 5, 2-lipped; the upper lip usually 2-lobed; the lower lip 3-lobed, white with purple dots, hairy.
- Stamens: 4.
- Pistils: Ovary superior, 4-parted; stigmas 2-cleft.
- Fruits: Nutlets black, oblong, about 1/20 inch long.
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