139. Marchantiaceæ (p. 727). Thallus radiate or dichotomous, the epidermis usually porose. Capsules borne on the under side of a pedunculate receptacle, irregularly dehiscent. Elaters 2-spiral. 140. Ricciaceæ (p. 730). Thallus radiate or dichotomous, the epidermis eporose. Capsules immersed in the thallus or sessile upon it, indehiscent. Elaters none. ANALYTICAL KEY TO THE ORDERS. CLASS I. DICOTYLEDONOUS PLANTS. (See p. 1.) SUBCLASS I. ANGIOSPERMÆ. Pistil consisting of a closed ovary. Cotyledons only two. DIVISION I. POLYPETALOUS: the calyx and corolla both present; the latter of _separate_ petals. [A.] _Stamens numerous, at least more than 10, and more than twice the sepals or lobes of the calyx._ [1.] _Calyx entirely free and separate from the pistil or pistils._ PAGE Pistils numerous but cohering over each other in a solid mass on an elongated receptacle. MAGNOLIACEÆ, 49 Pistils numerous, separate, but concealed in a hollow receptacle. Leaves opposite, entire; no stipules. CALYCANTHACEÆ, 167 Leaves alternate, with stipules. Rosa, in ROSACEÆ, 162 Pistils several, immersed in hollows of the upper surface of a large top-shaped receptacle. Nelumbo, in NYMPHÆACEÆ, 55 Pistils more than one, separate, not enclosed in the receptacle. Stamens inserted on the calyx, distinct. ROSACEÆ, 150 Stamens united with the base of the petals, monadelphous. MALVACEÆ, 96 Stamens inserted on the receptacle. Filaments much shorter than the anther; trees. ANONACEÆ, 50 Filaments longer than the anther. Flowers diœcious; twiners with alternate leaves. MENISPERMACEÆ, 51 Flowers perfect; if climbers, the leaves opposite. Leaves not peltate; petals deciduous. RANUNCULACEÆ, 34 Leaves peltate; petals persistent. Brasenia, in NYMPHÆACEÆ, 55 Pistils several-lobed, the ovaries united below the middle. RESEDACEÆ, 75 Pistils several, their ovaries cohering in a ring around an axis. MALVACEÆ, 96 Pistils strictly one as to the ovary; the styles or stigmas may be several. Leaves punctate under a lens with transparent dots. HYPERICACEÆ, 92 Leaves not punctate with transparent dots. Ovary simple, 1-celled, 2-ovuled. ROSACEÆ, 150 Ovary simple, 1-celled, with one parietal many-ovuled placenta. Leaves 2--3-ternately compound or dissected. RANUNCULACEÆ, 34 Leaves peltate, simply lobed. Podophyllum, in BERBERIDACEÆ, 52