320. Ovules 1-2. 321 Ovules more than 2. 325 321. Calyx-lobes very unequal, the upper two almost wholly united, the side ones small, the lowest the longest, enlarged after flowering, scarious. Corolla reddish-yellow; standard auricled at base. Fruit falcate-ovate, enclosed by the calyx, 1-seeded, 2-valved. Twining undershrubs. (See 293.) =Cylista= Ait. Calyx-lobes about equal, but the upper ones sometimes more or less united, not or scarcely enlarged after flowering. 322 322. Fruit dehiscing by two valves, more or less flattened, straight or nearly so. Upper calyx-teeth usually more or less united. Standard auricled at base. Leaflets usually entire. 323 Fruit not or very tardily dehiscing, turgid or curved to spiral, exceeding the calyx. Upper calyx-teeth scarcely or not united. Leaflets usually toothed. Stipules adnate to the leafstalk. 324 323. Seeds orbicular or reniform, with a more or less distinct outgrowth at the hilum; hilum orbicular or oblong, the funicle attached in the middle or nearly so. Standard orbicular or obovate. Twining or decumbent, rarely erect plants. (See 239.) =Rhynchosia= Lour. Seeds oblong, without an outgrowth at the hilum; hilum linear, the funicle attached at its apex. Upper calyx-teeth not or shortly united. Standard oblong or obovate. Erect or decumbent, rarely twining plants. (See 239.) =Eriosema= DC. 324. Fruit straight, globular or ovoid, thick, wrinkled. Flowers in slender, more or less spike-like racemes, yellow, rarely white. Herbs.--Species 10. North Africa and Abyssinia; several species also naturalized in South Africa. Used as fodder or in medicine. =Melilotus= Juss. Fruit more or less curved (sickle-or kidney-shaped) or spirally coiled, usually flattened. Flowers in short racemes or in heads.--Species 35. North Africa to Abyssinia and South Africa; several species also naturalized in the Mascarene Islands. Some of them (especially _M. sativa_ L., lucern) are used as fodder, or medicinal plants, and for making paper and brush-wares, others are noxious as burs. =Medicago= L. 325. Upper calyx-lobes more or less, sometimes entirely united. Corolla yellow. Standard suborbicular, auricled at base. Fruit linear or oblong, constricted between the seeds, dehiscing by two valves. Leaflets entire, gland-dotted. 326 Upper calyx-lobes not or scarcely united. Standard oblong or obovate. Fruit dehiscing at the upper suture or indehiscent, rarely tardily dehiscing by two valves. Leaflets usually toothed. Stipules adnate to the leafstalk. 328 326. Upper calyx-lobes shortly united. Keel exceeding the wings. Fruit oblong, curved, turgid, 1-celled. Seeds with an outgrowth at the hilum. Viscid, twining herbs or undershrubs.--Species 1. South Africa and Madagascar. =Fagelia= Neck. Upper calyx-lobes united for the greater part or entirely. Fruit compressed and transversely septate. 327