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Keyed in multiple places:

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Key to Combretaceae

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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
  2 Liana or scandent shrub, lacking pneumatophores; petiole not glandular; petals 10-20 mm long, white, pink, or red; leaf blades not glandular
1 Leaves alternate; flowers either in heads (arrayed in axillary or terminal panicles or racemes) or in spikes.
    3 Trees or shrubs, lacking pneumatophores; flowers aggregated into cone-like heads, these in axillary or terminal panicles or racemes
    3 Trees or shrubs, either with or without pneumatophores; flowers in axillary spikes.
      4 Mangroves, often with pneumatophores; petals present, white
      4 Non-mangroves; petals absent

Key J5: trees with opposite simple leaves with entire margins

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1 Leaves deciduous (medium to pale green, thin in texture); leaves strictly opposite.
  2 Leaves 10-70 cm wide, cordate or subcordate at the base; flowers 5-merous, bilaterally symmetrical, large (20-70 mm long), the petals connate into a tube; fruit a capsule.
    3 Flowers white to yellow; capsules linear, >10× as long as wide; leaf undersurface with curly simple hairs; nectar glands present in the main vein axils on the undersurface of the leaf (visible from the underside or the upperside in fresh leaves and herbarium specimens as a triangle 1-4 mm on a side)
    3 Flowers lavender; capsules ellipsoid, < 2× as long as wide; leaf undersurface with branched (dendritic or stellate) hairs; nectar glands absent
  2 Leaves 1-12 cm wide, cuneate to rounded at the base; flowers 4-6-merous, radially symmetrical, small to medium (< 25 mm long), the petals either connate into a tube or separate and clawed; fruit a drupe or capsule.
      4 Leaves with prominently parallel-arcing secondary veins; corolla 4-merous, < 8 mm long, white to cream; inflorescence a many-flowered corymb or head; flowers white to cream; fruit a drupe
      4 Leaves with complexly branching secondary and tertiary veins; corolla 5-6-merous, 12-25 mm long, either greenish-yellow and mottled with purple, or white, pink, or purple; inflorescence a few-flowered cyme or many-flowered cymose panicle; fruit a capsule.
        5 Leaves 4-20 cm long, 2.5-12 cm wide; petals connate into a 15-25 mm long tube, either greenish-yellow and mottled with purple; some calyx lobes expanding to 7 cm long and 5 cm wide, petaloid (pink to yellowish); capsule 2-valved; [native, in saturated, boggy seepages and streamheads, se. SC to FL]
        5 Leaves 2.5-7 cm long, 1.5-4 cm wide; petals separate, clawed, 12-20 mm long (including the 6-9 mm long claw), white, pink, or purple; calyx remaining small and sepaloid (3.5-5 mm long); capsule 4-6-valved; [introduced, persistent from planting in upland to moist situations]
1 Leaves evergreen (dark green or gray-green, thick in texture); leaves opposite or subopposite (offset by < 2mm from the opposing leaf).
          6 Mangroves, with one of various adaptations to growing in tidal or near-tidal, saline situations: prominent salt-excreting glands on the petiole (Laguncularia in COMBRETACEAE), or prop roots (Rhizophora in RHIZOPHORACEAE), or abundant pneumatophores (Avicennia in ACANTHACEAE); [FL and less commonly subtropical shores of other, especially Gulf Coast, southeastern states].
             7 Leaves broadly elliptic, light green on both surfaces, rounded to broadly cuneate at the base, rounded and often retuse at the tip; petiole with 2 prominent salt-excreting glands; plants with neither prop-roots from the trunk and branches, nor pneumatophores from the roots
             7 Leaves narrowly elliptic, dark green above, cuneate at the base, acute to obtuse at the tip; petiole without salt glands; plants with either prop-roots from the trunk and branches, or pneumatophores from the roots.
               8 Plants with numerous pneumatophores ascending from the roots and terminating in a blunt tip; leaves gray on the undersurface
               8 Plants with prominent prop-roots descending to the ground from the trunk and branches; leaves light green on the undersurface
          6 Non-mangroves; [collectively widespread].
                 9 Secondary leaf veins relatively few, further branching and reticulating into the tertiary vein structure; [collectively widespread].
                   10 Leaves strictly opposite, blue- or gray-green on both surfaces, suborbicular (about as wide as long), strongly aromatic when fresh
                   10 Leaves opposite or subopposite (offset by < 2mm from the opposing leaf); dark green above, pale green below; oblancolate, elliptic, or ovate (distinctly longer than wide), not aromatic when fresh
                     11 Twigs with spines; leaf venation with 3 primary veins from near the blade base; fruit a spherical berry, 5-12 cm long
                     11 Twigs lacking spines; leaf venation pinnate; fruit an elliptical drupe, < 2.5 cm long
                 9 Secondary leaf veins very many, closely parallel to one another and extending unbranched to the leaf margin.
                       12 Leaves elliptic, widest near the midpoint of the blade, ca. 2× as long as wide; flowers in axillary thyrses; fruit a 1-seeded drupe, 2-4 cm long
                       12 Leaves spatulate, widest towards the broadly rounded tip, ca. 1.2-1.6× as long as wide; flowers terminal on the branches, 1-3; fruit a leathery capsule, (4-) 6-9 (-12)-valved, 5-8 cm long
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