5. Ulmaceae - Elm; trees or shrubs with watery sap; leaf bases oblique; fruit an evenly winged samara or drupe.
6. Fagaceae - Beech, oak; trees or shrubs; leaves alternate (in oak, leaves and buds clustered at the ends of the branches, pith 5-angled); fruit a nut, at least partially covered by a cupule of hardened bracts.
7. Betulaceae - Birch, alder; Deciduous trees or shrubs; leaves simple, serrate; staminate flowers in catkins.
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