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Pycnanthemum tenuifolium Schrad.
NARROWLEAF MOUNTAINMINT
Life   Plantae   Dicotyledoneae   Lamiaceae   Pycnanthemum

Pycnanthemum tenuifolium, Narrow-leaved Mountain Mint
© Copyright Sheryl Pollock 2011 · 8
Pycnanthemum tenuifolium, Narrow-leaved Mountain Mint

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Pycnanthemum tenuifolium, Narrow-leaved Mountain Mint
© Copyright Sheryl Pollock 2011 · 8
Pycnanthemum tenuifolium, Narrow-leaved Mountain Mint
Pycnanthemum tenuifolium, Narrow-leaved Mountain Mint
© Copyright Sheryl Pollock 2011 · 6
Pycnanthemum tenuifolium, Narrow-leaved Mountain Mint

Pycnanthemum tenuifolium, Narrow-leaved Mountain Mint
© Copyright Sheryl Pollock 2011 · 5
Pycnanthemum tenuifolium, Narrow-leaved Mountain Mint
Pycnanthemum tenuifolium, leaf and flower
© Kay Yatskievych, 2003 · 1
Pycnanthemum tenuifolium, leaf and flower

Associates · map
FamilyScientific name @ source (records)
Apidae  Bombus bimaculatus @ UCRC_ENT (1)

Bombus citrinus @ AMNH_BEE (7)

Bombus griseocollis @ UCRC_ENT (5)

Bombus impatiens @ AMNH_BEE (2)

Bombus pensylvanicus @ UCRC_ENT (1)

Xylocopa virginica @ AMNH_BEE (1)
Colletidae  Hylaeus affinis @ UCRC_ENT (1)

Hylaeus mesillae @ UCRC_ENT (3)
Dictyopharidae  Phylloscelis pallescens @ UDCC_NRI (10)
Halictidae  Halictus confusus @ AMNH_BEE (1)

Halictus ligatus @ AMNH_BEE (1)
Megachilidae  Anthidiellum notatum @ UCRC_ENT (1)

Megachile brevis @ UCRC_ENT (3)
Pucciniaceae  Puccinia menthae @ BPI (1)
Thyreocoridae  Corimelaena pulicaria @ NCSU (1)

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Pycnanthemum tenuifolium Schrad. Slender Mountain-mint
Lamiaceae — Mint family
Native
Pycnanthemum tenuifolium
Cedar Swamp Wildlife Area
June 2002 Pycnanthemum tenuifolium Pycnanthemum tenuifolium Pycnanthemum tenuifolium
White Clay Creek
August 2016

Search Google Delaware USDA

Photos copyright David G. Smith

Delaware Wildflowers main page

Following modified from MissouriPlants.com
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Pycnanthemum tenuifolium Schrad.

Slender Mountain Mint

Pycnanthemum tenuifolium plant

Family - Lamiaceae

Habit - Perennial forb with slender rhizomes.

Stem - Strongly ascending to erect, to 80 cm, usually glabrous.

Pycnanthemum_tenuifolium_stem.jpg Stem and node.

Leaves - Opposite, sessile, simple. Blades 1.5-5.5 cm long, 1.0-5.5 mm wide (those of the largest leaves 1.5-5.5 mm), linear, angled or short-tapered at the base, the margins entire, the surfaces glabrous, green.

Pycnanthemum_tenuifolium_leaves.jpg Stem and leaves.

Pycnanthemum_tenuifolium_leaves2.jpg

Pycnanthemum_tenuifolium_leaf1.jpg Leaf adaxial.

Pycnanthemum_tenuifolium_leaf2.jpg Leaf abaxial.

Inflorescence - Inflorescences relatively dense, often appearing relatively flat-topped, only the lowermost branches observable. Bracts dissimilar to the foliage leaves (2.5-4.0 mm long, lanceolate to narrowly ovate, with a thickened midvein and a nearly spinescent tip), not whitened, but grayish green, densely pubescent with short, curled hairs on the surfaces and longer, bristly hairs on the margins and tip. Bractlets 2-3 mm long, mostly lanceolate.

Pycnanthemum_tenuifolium_inflorescence.jpg Inflorescence.

Flowers - Calyces 3.5-5.0 mm long, actinomorphic or nearly so, densely or occasionally sparsely pubescent with short, curled hairs below the lobes, lacking longer bristly hairs on the margins, the lobes all similar in size and shape 1.0-1.5 mm long, triangular, sharply pointed and sometimes with a minute, sharply pointed extension of the midnerve. Corollas strongly zygomorphic, 5-7 mm long, white or less commonly pale lavender, the upper lip entire or shallowly notched, the lower lip 3-lobed, spotted with purple.

Pycnanthemum_tenuifolium_calyces.jpg Calyces.

Pycnanthemum_tenuifolium_flowers.jpg Flowers.

Fruits - Dry schizocarps, separating into 4 nutlets, these 0.7-1.0 mm long, usually glabrous.

Flowering - June - September.

Habitat - Forests, glades, prairies, bluffs, pastures, fields, roadsides.

Origin - Native to the U.S.

Lookalikes - Other members of the Pycnanthemum genus, also some members of the Eupatorium genus such as E. hyssopifolium .

Other info. - This plant is common across all of Missouri with the possible exception of a few counties in the extreme northwest of the state. Its U.S. distribution includes most of the eastern half of the country. The plant is easy to recognize with its characteristic inflorescences and very narrow leaves - but note that the main stem leaves can sometimes appear abnormally wide. Aromawise, this plant is a bit of a letdown, having almost no minty fragrance. The lack of fragrance is actually a strong clue to the plant's specific identity, since the other Missouri Pycnanthemums are more strongly aromatic. The plant is found across a wide variety of habitat types.

Photographs taken at Shaw Nature Reserve, Franklin County, MO, 6-15-2007, and at Whetstone Conservation Area, Callaway County, MO, 7-15-2016 (SRTurner).



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Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Pycnanthemum+tenuifolium+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Pycnanthemum+tenuifolium+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

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Number of matches : 9
Query: SELECT * FROM img WHERE ready=1 and taxon like "Pycnanthemum tenuifolium%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4761 [detail]
© 2016 Keir Morse

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4762 [detail]
© 2016 Keir Morse

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4763 [detail]
© 2016 Keir Morse

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4764 [detail]
© 2016 Keir Morse

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4765 [detail]
© 2016 Keir Morse

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4766 [detail]
© 2016 Keir Morse

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4767 [detail]
© 2016 Keir Morse

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4768 [detail]
© 2016 Keir Morse

Pycnanthemum tenuifolium
Pycnanthemum tenuifolium
Narrow-leaved Mountain-mint
ID: 0000 1111 1234 4769 [detail]
© 2016 Keir Morse

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


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