American Senna is a perennial plant that grows to 0.5–2 meters high.
Its leaves are evenly pinnate, with prominent glands on its
petioles below the first pair of leaflets.
It has bright yellow flowers that are decidedly not pea-like.
The flowers have three sterile upper stamens and seven fertile lower stamens of unequal length, all with dark brown anthers.
Each flower's ovary and style are covered in dense hairs.
Its legumes (seed pods) are 7–12 cm long and initially covered in soft straight hairs.
Within each pod, each seed compartment is a nearly square segment.
(Note: Maryland Wild Senna (Senna marilandica) is very similar, but its seed segments are rectangular, being much shorter than broad,
and its developing legumes are hairless or nearly so.)
20 August 2024
Leopold's Preserve, Haymarket, VA
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18 August 2014
Manassas National Battlefield Park, Manassas, VA
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25 August 2023
Manassas National Battlefield Park, Manassas, VA
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18 August 2014
Manassas National Battlefield Park, Manassas, VA
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17 July 2015
Manassas National Battlefield Park, Manassas, VA
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19 August 2025
Manassas National Battlefield Park, Manassas, VA
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20 August 2024
Leopold's Preserve, Haymarket, VA
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20 August 2024
Leopold's Preserve, Haymarket, VA
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20 August 2024
Leopold's Preserve, Haymarket, VA
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19 August 2025
Manassas National Battlefield Park, Manassas, VA
(showing glands on petioles)
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20 August 2024
Leopold's Preserve, Haymarket, VA
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20 August 2024
Leopold's Preserve, Haymarket, VA
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18 August 2014
Manassas National Battlefield Park, Manassas, VA
(ripening seed pods)
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19 November 2017
Manassas National Battlefield Park, Manassas, VA
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19 November 2017
Manassas National Battlefield Park, Manassas, VA
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19 November 2017
Manassas National Battlefield Park, Manassas, VA
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