Flora of the Southeastern United States
2022 Edition

Colors

Data mode

Key to Corallorhiza

1 Lip with two lateral teeth or lobes; lateral sepals spreading to down-curved.
..2 Sepals 1-veined
..2 Sepals 3-veined.
....3 Middle lobe of lip expanded slightly or not at all distally, the ratio of the width of the dilated part to the base of the mid-lobe < 1.5; floral bracts averaging 0.5-1.0 mm long
....3 Middle lobe of the lip distinctly expanded, the ratio of the width of the dilated part to the base of the midlobe greater than 1.5; floral bracts averaging 1.0-2.8 (-4.5) mm long
1 Lip without lateral teeth or lobes (though sometimes erose or minutely toothed near its apex); lateral sepals arching, upcurved, or forward-directed.
......4 Sepals and petals 3-4.5 mm long; dorsal sepal < 4.5 mm long, 1-nerved; flowering Aug-Oct.
......4 Sepals and petals 5-7.5 mm long; dorsal sepal > 4.5 mm long, 3-nerved; flowering either Apr-May or mid Jul-Aug.
........5 Lip with prominent, thickened, involute margins; flowering mid Jul-Aug
........5 Lip planar; flowering Apr-May