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Venus' Looking Glass, Clasping Bellwort, Clasping Venus' Looking Glass, Roundleaved Triodanis - Triodanis perfoliata


Family: Campanulaceae - Bellflower family Genus Common Name: Venus' Looking-glass Native Status: NativeDicot Annual Herb
Triodanis perfoliata - Venus' Looking Glass, Clasping Bellwort, Clasping Venus' Looking Glass, Roundleaved Triodanis. Synonym: Specularia perfoliata. There are 7 species of Triodanis in the United States. T. perfoliata is the most widespread, being found in all states except Alaska, Hawaii, and Nevada, and in much of Canada. T. biflora, a more southern species, is found in 24 of the 50 states, and is not reported in Canada. Texas is the only state where all 7 species of Triodanis are found. This native plant is considered weedy or invasive by some authorities.

Found in:
AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY

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Triodanis perfoliata

Distribution of Triodanis perfoliata in the United States and Canada:
USDA Plants Distribution Map temporarily unavailable.
Blue=Native; Grey=Introduced

Map from USDA Plants Database:
USDA, NRCS. 2017. The PLANTS Database (http://plants.usda.gov, 22 Sep 2017). National Plant Data Team, Greensboro, NC 27401-4901 USA.

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Site: Pigeon Mountain - Estelle Area, Walker County GA Date: 2011-May-21Photographer: Gerald C. Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
The purple to lavender blossom has a 5-lobed corolla, 5 stamen, and a 3-lobed stigma on a relatively thick style. The blossoms are in the leaf axils.
Triodanis perfoliata

Site: Pigeon Mountain - Estelle Area, Walker County GA Date: 2011-May-21Photographer: Gerald C Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
I read one report that the top most leaves are opposing. The remainder of the leaves are alternating.
Click on the photo for a larger image
Triodanis perfoliata

Site: Pigeon Mountain - Estelle Area, Walker County GA Date: 2011-May-21Photographer: Gerald C Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
Clasping Venus' Looking Glass is a relatively small plant, rarely growing as tall as 30, and is usually half that height or less. The leaves are alternate, clasping the grooved stem. They are toothed and almost round, appearing cordate as they clasp the stem. The plant is only slightly hairy, with small hairs along the ridges of the stem, and with ciliate leaf margins.
Click on the photo for a larger image
Triodanis perfoliata

Site: Pigeon Mountain - Estelle Area, Walker County GA Date: 2011-May-21Photographer: Gerald C Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
Unopened blossom.
Click on the photo for a larger image
Triodanis perfoliata

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2017
Photographs Copyright owned by the named photographer