Order 1. =Juglandaceæ (Walnuts).= Leaves _scattered_, _imparipinnate_, rich in _aromatic_ compounds. _Stipules absent._ Flowers unisexual. _Monœcious._ The ♂-catkins are lateral, generally on naked branches of the previous year, cylindrical, pendulous, many-flowered; the two bracteoles and the 2–4-leaved perianth of the ♂-flower unite with the subtending bract; the ♂-flower has indefinite stamens (6–20 in _Juglans_, Fig. 337 _A-D_). The ♀-catkins are terminal, generally on branches of the same year, few-flowered (Fig. 337 _F_); the ♀-flowers have a _superior_, 4-leaved perianth, a bicarpellate gynœceum, two styles with stigmas on the internal surface. The ovary, bracteoles and bract all unite together (Fig. 337 _E_). The fruit is generally a green or black _drupe_,[34] whose flesh (outer soft portion) in _Carya_ and _Juglans_ ruptures more or less irregularly, and frees the stone (“Walnut”).--~The stone in _Juglans_ is divided internally by one true (Fig. 337 _H_) and by several false, low partition walls into several _incomplete_ compartments, so that the two large _cotyledons_ become lobed and incised to fit like a cast into the irregularities of the inner surface of the stone; the embryo is exendospermous and covered with a thin testa.--THE LEAF SCARS are large and cordate with 3 groups of vascular bundles. The PITH in _Juglans_ and _Pterocarya_ is divided into chambers. The stone ruptures, on germination, along the dorsal suture into 2 valves; the cotyledons remain underground. In _Juglans regia_ a long row of accessory buds is found on the lowest internode (epicotyl) above the axils of the cotyledons. _Pollination by the wind._ Both protogynous and protandrous examples of _Juglans regia_ occur.--33 species, mostly in temperate North America.--USES. Walnuts are obtained from _J. nigra_ and _regia_; Hickory from North American species of _Carya_. The oil-containing seeds of several species are edible. _Pterocarya_ and others are cultivated as ornamental plants.~ [Illustration: FIG. 338.--_Myrica gale_: _a_ young fruit; × the bracteoles with numerous glands; _b_ longitudinal section of fruit.] Order 2. =Myricaceæ=. To this order belong shrubs or trees which have penninerved, simple, at most lobed or pinnatifid leaves, with or without stipules, and with yellow, aromatic, resin glands (Fig. 338 _a_). The flowers, situated in catkin-like spikes, are unisexual and _naked_, and supported by scale-like floral-leaves. ♂-flower: 4–6 (–16) stamens with short filaments; ♀: generally situated singly. The gynœceum has a short style with 2 long stigmas, and unites with the bracteoles, which form wing-like outgrowths on the ripe drupe as in _Pterocarya_ in the Juglandaceæ (Fig. 338). Cotyledons fleshy (Fig. 338 _b_).--_Myrica_; _Comptonia_.