Fruit-valves with a prominent midnerve. Seeds in two rows, ovoid. Sepals spreading. Petals white. Leaves undivided. (See 18.) =Turritis= L. 67. (60.) Median glands absent. Fruit-valves with a prominent midnerve. Cotyledons convex or folded; radicle incumbent. Sepals erect or converging. Petals yellow or violet. Glabrous plants. 68 Median and lateral glands present, sometimes blended into a ring, rarely (_Nasturtium_) median glands absent, but then fruit-valves with a faint or scarcely visible midnerve. Sepals erect or spreading. Petals white or yellow, sometimes with red or violet veins. 69 68. Petals violet. Stigmatic lobes long, erect, sometimes cohering. Cotyledons folded. (See 50.) =Moricandia= DC. Petals yellowish. Stigmatic lobes short or imperceptible. Seeds in a single row, oblong. Cotyledons convex. Leaves undivided.--Species 1. North Africa to Nubia. Used as a vegetable. =Conringia= Heist. 69. Radicle of the embryo accumbent. Sepals not saccate. 70 Radicle of the embryo incumbent; cotyledons usually folded. 71 70. Fruit-valves with a strong midnerve. Seeds in a single row. Petals yellow.--Species 3. North, East, and South Africa, also naturalized in the Mascarene Islands. Used as vegetables, salad, or fodder. “Wintercress.” =Barbarea= R. Br. Fruit-valves with a faint midnerve not reaching to the top. Seeds usually in two rows.--Species 15. Some of them (especially _N. officinale_ R. Br., watercress) yield salad, condiments, and medicaments. (Including _Roripa_ Scop.) =Nasturtium= R. Br. 71. Cotyledons not folded. Fruit not beaked; valves with 1-3 strong ribs. Glands confluent into a ring. 72 Cotyledons folded. Fruit usually beaked. 73 72. Style-apex truncate beneath the stigma. Seeds striate. Petals white. Leaves broad-cordate, toothed.--Species 1. North-west Africa. Used medicinally. (Under _Sisymbrium_ L.) =Alliaria= Adans. Style-apex notched beneath the stigma. Petals usually yellow.--Species 25. Some are used as vegetables or in medicine. (Including _Kibera_ DC. and _Nasturtiopsis_ Boiss.) =Sisymbrium= L. 73. Fruit with a flat, sharp-edged beak, dehiscing in two valves. Seeds globular. Herbs with lyrate leaves. 74 Fruit with a cylindrical or conical, terete or slightly flattened beak, or without a beak. 75 74. Fruit-valves with a single strong longitudinal nerve. Seeds in 2 rows. Sepals converging. Fruits erect, pressed against the stem.--Species 4. North Africa and northern East Africa. The seeds are used as a condiment or in medicine. (Including _Rytidocarpus_ Coss.) =Eruca= Lam. Fruit valves with 3 longitudinal nerves. Seeds in 1 row. Sepals spreading. (See 52.). =Sinapis= L. 75. Seeds oblong. Fruit-valves with a strong midrib. Lateral sepals saccate. Petals yellow. Undershrubs. Leaves undivided.--Species 6. Madeira and Cape Verde Islands. (Under _Brassica_ L.) =Sinapidendron= Lowe Seeds globular, sometimes slightly flattened. Herbs. 76 76. Fruit indehiscent, spongy. Leaves lyrate. (See 57.) =Rhaphanus= L.