[++] Calyx regular, the stamens as many as the lobes and opposite them or fewer; ovary superior.
99. [Urticaceæ] ([p. 461]). Flowers monœcious, diœcious, or (in Ulmeæ) perfect. Seeds exalbuminous or nearly so. Inflorescence very various.
[++][++] Perianth mostly none; at least the staminate flowers in aments or spikes or dense heads; albumen none.
100. [Platanaceæ] ([p. 466]). Trees, with alternate palmately lobed leaves, sheathing stipules, and monœcious flowers in separate globose heads. Ovary superior; fruit a club-shaped nutlet.
101. [Juglandaceæ] ([p. 467]). Trees, with alternate pinnate leaves, no stipules, and monœcious flowers, the staminate in aments. Ovary inferior; fruit a nut.
102. [Myricaceæ] ([p. 469]). Shrubs, with resinous-dotted leaves, with or without stipules, and monœcious or diœcious flowers, both kinds in short scaly aments. Ovary superior, becoming a small drupe-like nut.
[+] 3. Ovary 2–7-celled, with 1 or 2 suspended ovules in each cell, becoming 1-celled and 1-seeded; calyx mostly none or adherent to the ovary; trees or shrubs with simple leaves.
103. [Cupuliferæ] ([p. 470]). Flowers monœcious. Fruit a nut surrounded by an involucre, or (in Betuleæ) a small winged or angled naked nutlet in the axils of the scales of an ament.
[+] 4. Ovary 1-celled, becoming a 2-valved pod with two parietal or basal placentæ bearing numerous small comose seeds; perianth none.
104. [Salicaceæ] ([p. 480]). Diœcious trees or shrubs, with both kinds of flowers in aments, and simple alternate stipulate leaves.