NyctaginaceaeFour o'clock family

  - Leaves simple, alternate, entire, without stipules.
  - Often with opposite or whorled leaves at some nodes.
  - Flowers small with tubular corolla, unisexual.
  - Fruit a 1-seeded berry.

Diagnosis: Trees and treelets, without stipules, leaves simple, usually with a mixture of alternate and opposite leaves on same twig, often with 4 leaves at some nodes, margin entire, often with inconspicuous lateral veins.

Similar families
Lauraceae: twigs angular or grooved, weak aromatic odor or minute translucent dots.
Loranthaceae: no unpaired leaves.
Solanaceae: paired leaves arise together, not opposite; lateral veins conspicuous.

Diversity: Total: 4 genera, 9 species. Trees: 3 genera, 5 species.

Credits: Images and text copyright 2000-2007, William A. Haber,