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Lamiaceae
Collinsonia

not marked as a favorite taxon Collinsonia canadensis Linnaeus. Common name: Richweed, Northern Horsebalm. Phenology: Late Jul-Sep; Sep-Oct. Habitat: Cove forests, rich forests, especially over calcareous or mafic substrates. Distribution: QC, MI, and WI, south to Panhandle FL and LA. Recently found on Crowleys Ridge in the AR Coastal Plain.

Glossary (beta!)

Origin/Endemic status: Native

Synonymy ⓘ: = C, Fl6, G, Il, K4, Mi, Mo3, NE, NY, Pa, S, Tat, Tn, Va, W, WH3, WV, Shinners (1962b); = Collinsonia canadensis L. var. canadensis — F; < Collinsonia canadensis L. — RAB, Peirson, Cantino, & Ballard (2006); Collinsonia canadensis L. Basionym: Collinsonia canadensis L. 1753

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FAC (taxonomic split from wetland indicator species)
  • Eastern Mountains and Piedmont: FAC (taxonomic split from wetland indicator species)
  • Midwest: FAC (taxonomic split from wetland indicator species)
  • Northcentral & Northeast: FAC (taxonomic split from wetland indicator species)

Heliophily ⓘ: 3

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image #1 of Collinsonia canadensis© Keith Bradley | Original Image ⭷
image #2 of Collinsonia canadensis© Edwin Bridges | Original Image ⭷
image #3 of Collinsonia canadensis© Erik Danielson source | Original Image ⭷
image #4 of Collinsonia canadensis© Brandon Corder, some rights reserved (CC BY), uploaded by Brandon Corder source CC-BY | Original Image ⭷
image #5 of Collinsonia canadensis© Erik Danielson source | Original Image ⭷
image #6 of Collinsonia canadensis© Erik Danielson source | Original Image ⭷
image #7 of Collinsonia canadensis© Erik Danielson source | Original Image ⭷
image #8 of Collinsonia canadensis© Ann Walter-Fromson | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect to ascending perennial found in the understory of cove and other rich forests, especially over calcareous or mafic substrates.

Stems: Stems 4-angled, few-branched, mostly smooth.

Leaves: Leaves opposite, petiolate (upper ones nearly sessile), oval, 2-8 in. long, coarsely toothed, smooth.

Inforescence:

Flowers: Flowers in a loose, wide-branching panicle, pale yellow, ½ in. long, bilaterally symmetric, tubular and 2-lipped (lower lip prominently fringed), with 2 long-protruding stamens and an elongated style.

Fruits:

Comments: Ranging broadly over much of temperate eastern North American, this mint gives off a lemony scent when a plant is bruised or crushed.

Height: 2-3 ft.

plant sale text:

bloom table text:

description: Erect to ascending perennial found in the understory of cove and other rich forests, especially over calcareous or mafic substrates.

stems: Stems 4-angled, few-branched, mostly smooth.

leaves: Leaves opposite, petiolate (upper ones nearly sessile), oval, 2-8 in. long, coarsely toothed, smooth.

inflorescence:

flowers: Flowers in a loose, wide-branching panicle, pale yellow, ½ in. long, bilaterally symmetric, tubular and 2-lipped (lower lip prominently fringed), with 2 long-protruding stamens and an elongated style.

fruits:

comments: Ranging broadly over much of temperate eastern North American, this mint gives off a lemony scent when a plant is bruised or crushed.

cultural notes:

germination code:

native range: eastern North America



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