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Castanea
See list of 4 species in this genus-
1a. Leaf blades abaxially with multicellular, scale-like glands that may be embedded on blade surface
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2a. Leaf blades abaxially ± glabrous soon after expansion (sometimes with some simple hairs along the veins); winter buds glabrous; petioles mostly 10–30 mm long
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2b. Leaf blades abaxially sparsely to densely stellate pubescent (sometimes becoming glabrate later in season); winter buds pubescent; petioles mostly longer than 30 mm
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1b. Leaf blades abaxially lacking multicellular glands
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3a. Involcure subtending 2 or 3 nuts, with pubescent spine-like bracts; nuts mostly 20–30 mm wide; petioles 10–20 mm long
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3b. Involucre subtending a solitary nut (rarely 2), with usually glabrous spine-like bracts; nuts 7–19 mm wide; petioles 3–7 (–10) mm long
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Each photo represents one species in this genus.