Juglandaceae

Trees or shrubs, usually deciduous, monoecious, rarely dioecious; branchlets solid or with partitioned pith. Stipules absent. Leaves alternate, rarely opposite, odd- or even-pinnate; leaflets with glandular scales, often aromatic. Flowers unisexual, arranged in catkins, produced on the previous or current year’s growth. Catkins solitary or clustered, pendulous or erect, elongate. Male flowers subtended by an entire or 3-lobed bract, bracteoles 2 or absent; perianth 2–6-lobed or absent; stamens 3–50, filaments short. Female flowers subtended by an entire or 3-lobed bract, bracteoles 2–3 or absent; perianth 4-lobed or absent; ovary inferior, unilocular at apex, carpels usually 2; style 1, stigmas 2. Fruit a large nut, sometimes fleshy and drupe-like, dehiscent or indehiscent, or rarely a samara; seed 1, lacking endosperm.