In areas where both species may be found, Sessile Trillium can be confused with the similar looking
Little Sweet Betsy (Trillium-cuneatum).
Sessile Trillium typically has rounded leaf tips, as opposed to Little Sweet Betsy's pointed tips,
but that feature is highly variable and not sufficient for a definitive identification.
Also, Sessile Trillium's anthers are about 1/2 or more the length of the petals,
unlike Little Sweet Betsy's anthers which are always less than 1/2 the length of the petals.
Sessile Trillium's pollen emerges from the inside of its anthers ('introse anther dehiscense');
Little Sweet Betsy's pollen emerges from the sides of its anthers ('latrose anther dehiscence').
25 April 2013
Chesapeake and Ohio Canal National Park, Sharpsburg, MD
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24 March 2016
Riverbend Park, Great Falls, VA
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10 April 2013
Scotts Run Nature Preserve, McLean, VA
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10 April 2013
Scotts Run Nature Preserve, McLean, VA
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11 April 2018
Riverbend Park, Great Falls, VA
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7 April 2021
Balls Bluff Regional Park, Leesburg, VA
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7 April 2019
Great Falls National Park, Great Falls, VA
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2 April 2025
Riverbend Regional Park, Great Falls, VA
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25 April 2013
Chesapeake and Ohio Canal National Park, Sharpsburg, MD
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24 March 2016
Riverbend Park, Great Falls, VA
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10 April 2013
Scotts Run Nature Preserve, McLean, VA
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10 April 2013
Scotts Run Nature Preserve, McLean, VA
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13 June 2025
Riverbend Regional Park, Great Falls, VA
(fertilized ovary swelling)
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13 April 2026
Riverbend Park, Great Falls, VA
(note anthers are slightly more than half the length of the petals)
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13 April 2026
Riverbend Park, Great Falls, VA
(anthers 'introse anther dehiscense')
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