10. Anthers globose. Ovary incompletely 3-celled. Style short. Petals 5-6. Calyx much enlarged in fruit. Leaves with milky juice.--Species 3. West Africa. [Tribe HEISTERIEAE.] =Heisteria= Jaqu. Anthers linear. Ovary almost completely 3-4-celled. Style as long as the ovary. Petals 4-5. Calyx not enlarged in fruit. Leaves with watery juice.--Species 3. Tropical and South-East Africa. They yield fragrant wood, bark for tanning, edible fruits, and oily seeds, and are also used in medicine. [Tribe XIMENIEAE.] =Ximenia= Plum. [Illustration: OLACACEAE. _FLOW. PL. AFR._ _Pl. 37._ J. Fleischmann del. Olax Durandii Engl. _A_ Flowering branch. _B_ Branch of another specimen. _C_ Flower cut lengthwise.] [Illustration: ARISTOLOCHIACEAE. _FLOW. PL. AFR._ _Pl. 38._ J. Fleischmann del. Aristolochia bracteata Retz. _A_ Plant in flower. _B_ Flower. _C_ Lower part of the flower (the ovary cut lengthwise).] FAMILY 60. OCTOKNEMATACEAE Shrubs or trees. Leaves alternate, undivided, without stipules. Flowers in axillary racemes. Petals 5, valvate in bud. Stamens 5, opposite the petals; filaments short. Disc obscure. Ovary inferior, 1-celled, with a free filiform placenta and 3 pendulous ovules. Style divided into 3-5 two-or three-cleft lobes. Fruit woody, surrounded by the fleshy receptacle. Seeds with a thin coat; embryo minute, situated at the apex of the 8-furrowed albumen. (Under _OLACACEAE_.) Genus 1, species 3. Equatorial West Africa. =Octoknema= Pierre SUBORDER LORANTHINEAE FAMILY 61. LORANTHACEAE Shrubs, parasitic upon trees. Leaves undivided, exstipulate, sometimes scale-like. Perianth simple, with 2-6 valvate segments, often surrounded at the base by a calyx-like outgrowth of the receptacle. Stamens as many as and opposite the perianth-segments and inserted on them. Ovary inferior, with 1-4 indistinctly developed ovules. Style and stigma simple. Fruit succulent. Seeds albuminous.--Genera, 4, species 300. (Plate 37.) 1. Receptacle with a calyx-like outgrowth surrounding the base of the perianth. Flowers usually hermaphrodite. Anthers usually stalked and opening by two longitudinal slits. Style more or less filiform. Leaves well-developed.--Species 250. Tropical and South Africa. Some are used medicinally. (Plate 37). [Subfamily =LORANTHOIDEAE=.] =LORANTHUS= L. Receptacle without a calyx-like outgrowth. Flowers unisexual. Anthers sessile. [Subfamily =VISCOIDEAE=.] 2 2. Anthers adnate to the perianth; cells several or many, opening by pores. Placenta basal. Flowers in clusters of 3 or more.--Species 50. Some of them yield bird-lime or are used medicinally. “Mistletoe.” [Tribe VISCEAE.] =Viscum= L. Anthers seated on the perianth, but not adnate to it; cells 1-2, opening by longitudinal or transverse slits. Placenta central. Leaves scale-like. 3