d. Stipules if present sheathing the stem;

sepals three to six. _Polygonaceae_ 86 d. Stipules absent; sepals mostly five. _Chenopodiaceae_ 96 a. Ovary inferior or appearing so by the closely fitting calyx. b. Ovary six-celled; stamens six to twelve. _Aristolochiaceae_ 84 b. Ovary one-celled; stamens three to five. c. Leaves opposite; flowers often showy. _Nyctaginaceae_ 100 c. Leaves alternate; flowers not showy. _Santalaceae_ 82 =B. Both corolla and calyx present.= =C. Corolla of separate petals.= =D. Ovary superior.= a. Stamens more than ten in number. b. Pistils several to many, separate or united below. c. Pistils separate and distinct. d. Pistils enclosed in a hollow receptacle. e. Leaves opposite; petals numerous. _Calycanthaceae_ 158 e. Leaves alternate; petals mostly five. _Rosaceae_ 218 d. Pistils not enclosed in a receptacle. e. Stamens attached to the calyx. _Rosaceae_ 218 e. Stamens not attached to the calyx. _Ranunculaceae_ 126