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Triadenum

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1 Leaves narrowed to the cuneate or broadly cuneate (rarely truncate) base.
..2 Lower leaves sessile; sepals 5-7 mm long, acute (to obtuse); leaves lacking translucent or dark glands or punctae; styles 0.5-1.5 mm long (best seen in fruit)
..2 Lower leaves petiolate; sepals 3-5 mm long, obtuse; leaves with translucent glands and dark punctae; styles 1.5-3 mm long (best seen in fruit)
1 Leaves clasping, cordate, or subcordate at the base.
....3 Sepals 2.5-5 mm long at maturity, obtuse to acute; styles 0.5-1 (-1.5) mm long (best seen in fruit)
....3 Sepals 5-8 mm long at maturity, acute to acuminate; styles 1.8-3 mm long (best seen in fruit)
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