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2 Leaf undersurfaces usually lacking cuticular papillae along the stomatal bands; shrubs to 2 m tall (or trees in T. cuspidata); [of w. NC and VA northward, or naturalized from plantings].
3Stomata in (4-) 5-9 (-11) rows on each side of midvein; [native of ne. N. America, south to w. NC and VA]