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I. Leaflets not serrate; usually entire or sinuate (Plate 73).

II. ''Leaflets serrate. Leaf-scars without a pubescent band on their upper edge.''


 * Leaflets glabrous beneath, except for the axil tufts.


 * Leaflets pubescent beneath.

III. ''Leaflets serrate. Leaf-scars with a transverse pubescent band on their upper edge.''