Twining herbs with net-veined leaves and greenish or white flowers in panicles or racemes.
Plants with linear basal leaves, and perfect flowers, with 6-parted perianth, inferior ovary, and 6 stamens.
Herbs, with 6-parted perianth, inferior ovary, and 3 stamens.
Herbs, with irregular flowers, one petal, the lip, differing from the others in size and shape, inferior ovary, and one or two stamens adherent to the style.
Herbaceous plants with alternate leaves, and flowers without either calyx or corolla.
Trees or shrubs, with dioecious flowers in catkins.
Shrubs, with monoecious or dioecious flowers in catkins, and aromatic foliage.
Trees with alternate pinnately compound leaves and flowers in catkins.
Trees or shrubs with alternate simple leaves and inconspicuous monoecious flowers, the staminate flowers in catkins, and the pistillate in catkins or small clusters.
Trees (or 1 species shrubby), with alternate simple leaves and monoecious flowers, the staminate flowers in catkins, and the pistillate solitary or in small clusters. Fruit a nut (or acorn) enclosed in a cup or bur.
Herbs or trees, with small inconspicuous apetalous flowers.