1. Leaves evergreen (dark green, thick in texture)…2.
2. Inflorescence a many-flowered terminalpanicle; leaves generally ovate, elliptic or lanceolate (widest below or at the middle)…Ligustrum
2. Inflorescence a few-flowered axillary panicle or fascicle; leaves generally oblanceolate or obovate (widest above the middle)…Cartrema
1. Leaves deciduous (medium to pale green, thin in texture)…3.
3. Leaves obovate (or elliptic), apex broadly obtuse (sometimes acute); flowers 4-merous, petals separate nearly to base, linear, 1.5-3 cm long; fruit an ellipsoid drupe, blue, to 1.5 cm long...Chionanthus
3. Leaves ovate to elliptic, apex acuminate, acute, or narrowly obtuse; flowers 4-5-merous, petals fused, or if separate, then not linear; fruits various...4.
4. Leaves 1.5-7 cm wide, cuneate to rounded at the base, with prominently parallel-arcing secondary veins; flowers 4-merous, radially symmetrical, small (< 8 mm long); fruit a drupe; small trees…Cornus
4. Leaves 10-70 cm wide, cordate or subcordate at the base, with complexly branching secondary and tertiary veins; flowers 5-merous, bilaterally symmetrical, large (20-70 mm long); fruit a capsule; medium to large trees…5.
5. 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)…Catalpa
5. Flowers lavender; capsules ellipsoid, < 2× as long as wide; leaf undersurface with branched (dendritic or stellate) hairs; nectar glands absent…Paulownia
