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Key to Pisonia

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1 Tree or shrub; stem not armed; stipitate glands of the fruit restricted to the upper 1/3 to ½ of the length of the fruit
1 Scrambling woody vine or shrub; stem armed with axillary spines (these usually paired and catclaw-like); stipitate glands of the fruit ribs distributed along the full length of the fruit.
  2 Fruit 7-10 mm long × 3-4 mm wide; stipitate glands of the fruit ribs in single rows only
  2 Fruit 14-20 mm long × 4-5 mm wide; stipitate glands of the fruit ribs in double rows for portions of their lengths