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1 Leaves opposite and decussate; flowers in spikes or racemes. | |
2 Mangrove, a tree or erect shrub, often with pneumatophores; petiole with 2 glands near blade junction; petals ca. 1 mm long, greenish white; leaf blades with glands in sunken pits, several mm in from the leaf margin | |
1 Leaves alternate; flowers either in heads (arrayed in axillary or terminal panicles or racemes) or in spikes. | |
3 Trees or shrubs, either with or without pneumatophores; flowers in axillary spikes. | |