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Pycnanthemum tenuifolium Schrader. Slender Mountain-mint. Phen: Jun-Aug; Sep-Oct. Hab: Bogs, wet meadows, moist to wet forests. Dist: ME west to MN, KS, and OK, south to FL and TX.

Origin/Endemic status: Native

Taxonomy Comments: A diploid and tetraploid species (n = 20 and 40).

Synonymy : = Ar, C, F, Fl6, GrPl, GW2, Il, K1, K3, K4, Mi, NcTx, NE, NY, Pa, RAB, Tn, Tx, Va, W, WH3, Chambers & Hamer (1992); = Koellia flexuosa – S, misapplied; = Pycnanthemum flexuosum (Walter) Britton, Sterns, & Poggenb. – G, Tat, Grant & Epling (1943), misapplied

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FACW
  • Eastern Mountains and Piedmont: FACW
  • Great Plains: FAC
  • Midwest: FAC
  • Northcentral & Northeast: FAC

Heliophily : 7

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image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Joey Shaw source | Original Image ⭷
image of plant© Alan Cressler: Pycnanthemum tenuifolium, Floyd County Prairies area, Floyd County, Georgia 1 by Alan Cressler source | Original Image ⭷
image of plant© Emily Oglesby | Original Image ⭷
image of plant© Joey Shaw source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© Grant Morrow Parkins | Original Image ⭷
image of plant© Emily Oglesby | Original Image ⭷
image of plant© Emily Oglesby | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect, rhizomatous perennial found in bogs, wet meadows and moist to wet forests and clearings.

Stems: Stems slender, 4-angled, bushy-branched, smooth.

Leaves: Leaves opposite, mostly sessile, linear, to 2 in. long, gland-dotted and with mint-like odor.

Inforescence:

Flowers: Flowers crowded in dense, branching, flat-topped heads with small, white, hairy bracts in addition to flowers; each flower white to pale pink, less than ¼ in. long, tubular opening to 2 spreading lips and with 2 purple anthers.

Fruits:

Comments:

Height: 1-2 1/2 ft.

plant sale text: Narrow-leaf mountain-mint is an easy-to-grow southeastern native perennial with delightfully scented foliage. Just brush your hand lightly across the leaves to release the fresh minty fragrance. Narrow-leaf mountain-mint produces copious amounts of nectar, attracting and feeding many beneficial insects. Its upright stems bearing many small white flowers add an unusual cool touch to the summer garden, and make an excellent filler for flower arrangements.

bloom table text: This plant is attractive to the eye as well as being a rich source of nectar to a multitude of insects and butterflies. The scientific name for the Mountain-mint comes from the greek, pyknos, meaning dense, and anthemon, a flower. It refers to the crowded clusters of flowers with small, leafy bracts immediately below them. Mountain-mints are erect, perennial, aromatic, herbaceous plants with rhizomes and branched or branchless, four-angled stems. These plants are often found in ordinary soil, neither excessively wet nor dry. They are planted in spring or early fall and will grow in sun or light shade. One can propagate the plant by division or seed.

description: Erect, rhizomatous perennial found in bogs, wet meadows and moist to wet forests and clearings.

stems: Stems slender, 4-angled, bushy-branched, smooth.

leaves: Leaves opposite, mostly sessile, linear, to 2 in. long, gland-dotted and with mint-like odor.

inflorescence:

flowers: Flowers crowded in dense, branching, flat-topped heads with small, white, hairy bracts in addition to flowers; each flower white to pale pink, less than ¼ in. long, tubular opening to 2 spreading lips and with 2 purple anthers.

fruits:

comments:

cultural notes:

germination code: 1

native range: eastern United States