l82. OENOTHERACEAE — 183. HALORRHAGACEAE 399 



Calyx-tube cylindrical, long. Petals yellow. Fruit obscurely angled, 

 with a more or less membranous or leathery rind 9 



Seeds horizontal, sharply angled, with a thick coat. Leaves dentate. — 

 Species 2. Naturalized in North and South Africa. Ornamental plants ; 

 one species {0. biennis Scop.) has edible roots. (Under Oenothera L.) 



Onagra Tourn. 



Seeds ascending, rounded, egg-shaped, with an appendage at the top. 

 Leaves sinuate-dentate or pinnatitid. — Species 2. Naturalized in North 

 and South Africa and some tropical islands. Ornamental plants. 

 " Evening primrose." Oenothera Spach 



SUBORDER HALORRHAGINEAE 



FAMILY 183. HALORRHAGACEAE 



Herbs or underslirubs. Leaves undivided, lobed, or pinnately divided, 

 without stipules. Flowers solitary or in fascicles spikes or panicles, small, 

 regular, 2 — 4-merous. Petals free or in the female flowers wanting. Stamens 

 1—8. Anthers attached by the base, opening laterally by two longitudinal slits. 

 Ovar\- inferior, i-celled with a single ovule or with 4 ovules, or 4-celled with one- 

 ovuled cells. Ovules pendulous, inverted. Styles or sessile stigmas 2 or 4. 

 Fruit a nut, drupe, or schizocarp. Seeds albuminous ; embryo straight. — 

 Genera 3, species 15. (Plate 117.) 



1. Ovary i-celled with a single ovule. Styles or sessile stigmas 2. Sepals 2. 



Petals I — 2, or more frequently wanting. Stamens i — 2. Fruit a 

 drupe. Seed with a very short embryo. Terrestrial plants. Leaves 

 radical, kidney-shaped, crenate. Flowers in spikes or panicles. — 

 Species i. ]^3ast and Soutli Africa and Madagascar. Used medicinally. 



[Subfamil} GUNNEROIDEAE.] Gunnera L. 



Ovary i-celled with 4 ovules, or 4-celled. Styles or sessile stigmas 4. Sepals 

 4, sometimes scarcely perceptible in the female flowers. Petals 4 or 

 in the female flowers absent. Stamens 2 — 8. Seeds with a long embryo. 

 [Subfamily HALORRHAGOIDEAE.] . 2 



2. Ovary i-celled, sometimes incompletely 4-celled. Stamens 4. Fruit one- 



seeded, dry and indehiscent. Terrestrial plants. Leaves undivided. 

 Flowers in axillary clusters. — Species 9. {Serpicula L.) (Plate 117.) 



[Tribe HALORRHAGEAE.] Laurembergia Berg 



Ovary 4-celled. Fruit 2 — 4-seeded, usually separating into mericarps. 

 Aquatic plants. Leaves usually pinnateh' divided. Flowers solitary 

 and axillary or in terminal spikes. — Species 5. North, South, and 

 J'ast Africa and Madagascar. [Tribe MYRIOPHYLLEAE.] 



Myriophyllum L. 



