37. [Droseraceæ] ([p. 178]). Glandular-haired scapose marsh herbs, with regular 5-merous hypogynous flowers. Capsule 1-celled, with 3–5 many-seeded parietal placentæ. Anthers extrorse. Leaves circinate in vernation.
38. [Hamamelideæ] ([p. 179]). Shrubs or trees; flowers often polygamo-monœcious, in clusters, heads, or spikes; petals often none. Seeds 2 or more, bony, in a 2-beaked woody pod opening above, the base adnate to the calyx-tube. Stamens few or many. Leaves alternate, simple.
39. [Halorageæ] ([p. 180]). Aquatic or marsh herbs; flowers perfect or polygamo-diœcious, small, axillary or spicate; petals often none. Stamens 1–8. Ovary inferior, the calyx-limb obsolete or very short. Fruit small, indehiscent, 1–4-celled, 1–4-seeded. Leaves alternate or opposite, the submersed often dissected.
[*] 2. Ovary inferior (except in Lythraceæ), 1–several-celled; style entire; flowers perfect, regular or nearly so, mostly 4-merous; herbs, with simple and mostly entire leaves without stipules.
40. [Melastomaceæ] ([p. 183]). Calyx open. Stamens definite; anthers opening by an apical pore. Leaves opposite, 3–7-nerved; flowers cymose.
41. [Lythraceæ] ([p. 184]). Calyx-lobes valvate. Pod free, but enclosed in the calyx, membranous, 1–4-celled, many-seeded with axile placentæ. Leaves mostly opposite; flowers axillary or whorled; petals crumpled, or none.
42. [Onagraceæ] ([p. 186]). Calyx-lobes valvate. Ovary 1–4-celled, the cells 1–many-ovuled. Stamens 2, 4, or 8. Petals 2 or 4, convolute, or none. Leaves opposite or alternate.
[*] 3. Ovary inferior (except in Passifloraceæ and Ficoideæ), 1-celled with parietal placentæ or several-celled by the intrusion of the placentæ; flowers regular, perfect or unisexual; styles free or united; herbs.
[+] Embryo straight; cotyledons foliaceous; leaves alternate, often lobed.
43. [Loasaceæ] ([p. 193]). Flowers perfect. Stamens indefinite. Style entire or 2–3-cleft. Capsule 1-celled, with 2 or 3 many-seeded placentæ. Pubescence of hooked hairs.