Perianth simple, lobes or segments 1–2-seriate and often sepaloid, or small, or wanting.
Series I. Curvembryeæ. Endosperm frequently farinaceous. Embryo curved, excentric, lateral or peripheral, rarely straight. Ovules most frequently 1 in the ovary, or 1 in each loculus. Flowers ☿, in some genera unisexual or polygamous. Petals very rare. Stamens equal to the segments of the perianth, rarely fewer or more.
- Order 128. Nyctagineæ.
- „ 129. Illecebraceæ.
- „ 130. Amarantaceæ.
- „ 131. Chenopodiaceæ.
- „ 132. Phytolaccaceæ.
- „ 133. Batideæ.
- „ 134. Polygonaceæ.
Series II. Multiovulatæ Aquaticæ. Aquatic herbs, submerged. Ovary syncarpous; ovules numerous in each loculus or on each placenta.
- Order 135. Podostemaceæ.
Series III. Multiovulatæ Terrestres. Terrestrial trees or shrubs. Ovary syncarpous; ovules numerous in each loculus or on each placenta.
- Order 136. Nepenthaceæ.
- „ 137. Cytinaceæ.
- „ 138. Aristolochiaceæ.
Series IV. Micrembryeæ. Ovary syncarpous, monocarpous, or apocarpous. Ovules generally solitary in each carpel, rarely 2 or few. Endosperm copious, fleshy, or rarely farinaceous. Embryo very minute.
- Order 139. Piperaceæ.
- „ 140. Chloranthaceæ.
- „ 141. Myristiceæ.
- „ 142. Monimiaceæ.
Series V. Daphnales. Ovary monocarpous, very rarely syncarpous, with 2–4 loculi; ovules in the ovary or in each loculus, solitary, or in pairs. Trees or shrubs, very rarely herbs; flowers generally ☿. Perianth perfect, sepaloid, 1–2 seriate. Stamens perigynous, equal to the lobes of the perianth, or double unless fewer.