Dig deeper at SERNEC, a consortium of southeastern herbaria.
You may also want to check Trees, Shrubs, and Woody Vines of North Carolina
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Malvids: Sapindales
Chalk Maple, Small Chalk Maple, White-bark Maple
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JK Marlow jkm070407_059
April McCormick County SC
Stevens Creek Heritage Preserve
Leaves variably pubescent beneath, but (unlike A. barbatum) not glaucous, per Native Trees of the Southeast, An Identification Guide.
COMPARE leaves of Black, Chalk, Florida, Norway and Sugar Maple
JK Marlow jkm130406_941
April Aiken County SC
Flowers in terminal corymbs, pedicels filiform; calyx tube campanulate, per Vascular Flora of the Carolinas.
COMPARE flowers of Maple species
JK Marlow s060506_c
May Pickens County SC
Lobes narrower at the tip than at the base, tips pointed (even acuminate), per Native Trees of the Southeast, An Identification Guide.
Richard and Teresa Ware rtw_acer_leucoderme_3
Sinus shallow, the angle > 90° (terminal lobe typically broadly triangular), per Weakley's Flora.
Richard and Teresa Ware rtw_acer_leucoderme_4
The bark on old trees can be completely black as if charred by fire, per The Native Maples of Georgia. Tipularia (Ware, 2003).
Ron Lance rwl_acerleucoderme
September McCormick County SC
The rarest and smallest of the maples found in the South, per The Native Maples of Georgia. Tipularia (Ware, 2003).
Richard and Teresa Ware rtw_a_leucoderme_sfp_1
"leuco" (white) + "derme" (skin) - refers to the white bark of young trees, per The Native Maples of Georgia. Tipularia (Ware, 2003).
Richard and Teresa Ware rtw_a_leucoderme_sfp_4
Bark often pale brown to whitish, except on old trunks, per Woody Plants of the Southeastern US: A Winter Guide.