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Key to Piper

Piperaceae

Piper

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1 Leaves ca. 2× as long as wide; leaf base obliquely rounded, cuneate, or slightly cordate (the 'notch' < 0.5 cm deep); leaf venation pinnate; inflorescences solitary and borne opposite the leaves; [subgenus Radula]
1 Leaves ca. 1-1.2× as long as wide; leaf base deeply cordate, oblique or symmetrical (the 'notch' > 1 cm deep); leaf venation palmate or pinnate; inflorescences either solitary and borne opposite a leaf or 2-6 in an umbellate cluster in the leaf axils; [subgenus Lepianthes].
  2 Inflorescence solitary and borne opposite the leaves; leaf base strongly asymmetrical; leaf venation pinnate
  2 Inflorescences 2-6 in an umbellate cluster in the leaf axils; leaf base symmetrical; leaf venation palmate