Flora of the Southeastern United States
2022 Edition

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Key to Swida

1 Leaves alternate (the internodes typically short and therefore the leaves looking nearly whorled)
1 Leaves opposite.
..2 Veins usually 5 or more per leaf side.
....3 Bark of older branches and stems splitting longitudinally, appearing braided; leaves without tufts of trichomes in axils of secondary veins on abaxial surface.
......4 Abaxial leaf surface not coronulate, trichomes appressed and rigid, and erect and curling, on the same leaf, leaf base usually rounded or truncate
......4 Abaxial leaf surface coronulate, trichomes all appressed and rigid, leaf base usually cuneate
....3 Bark of older branches and stems smooth, with scattered protruding lenticels; leaves with tufts of trichomes in axils of secondary veins on the abaxial surface.
........5 Area surrounding lenticels suffused with purple; leaves suborbicular or broadly ovate; 7-9 veins per leaf side; tertiary veins usually prominent
........5 Area surrounding lenticels not differentiated; leaves lanceolate, elliptic, or ovate; 5-7 veins per leaf side; tertiary veins not prominent
..2 Veins usually 3-4 per leaf side.
..........6 Trichomes appressed or slightly raised on the lower leaf surface.
............ 7 Multiple stems from a single rootstock (occasionally appearing rhizomatous from decumbent stems); lenticels not protruding, bark swelling between lenticels; fruit blue
............ 7 Rhizomatous, forming large colonies; lenticels protrude slightly, older stems appear verrucose; fruit white
..........6 Trichomes erect on the lower leaf surface.
............ ..8 Drupes purple-black; shrub short-rhizomatous, the stems therefore clustered; [alien]
............ ..8 Drupes blue to whitish-blue or white; shrub rhizomatous, with aerial stems spaces 1-6 dm apart; [native]
............ ....9 Petioles 3-7 mm long; leaf veins evenly spaced
............ ....9 Petioles 8-25 mm long; leaf veins emanate from the basal half of the leaf