88. CRUCIFERAE 325 



64. Seeds oblong. Cotyledons not folded. Sepals converging or erect, the 



lateral saccate at the base. Petals purple or violet. — ■ Species 2. North 



Africa. Ammosperma Hook. fil. 



Seeds ovoid or globose. Cotyledons folded. Fruit-valves i-nerved. 

 Sepals erect or spreading, not saccate. (See 50.). Diplotaxis DC, 



65. Fruit-valves without distinct veins, opening elastically. Fruit linear or 



linear-lanceolate. Seeds in a single row, oblong or elliptical, not winged. 

 Sepals not saccate. Leaves usually pinnately divided. — Species8. Some 

 of them are used as salad or in medicine. " Bitfercress." Cardamine L. 

 Fruit-valves with distinct veins, not elastic. Fruit linear. Leaves usually 

 undivided 66 



66. Fruit-valves with a faint midnerve. Seeds in a single row. (See 13.) 



Arabis L. 

 Fruit-valves with a prominent midnerve. Seeds in two rows, o\'oid. 

 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. Cotyle- 



dons folded. (See 50.) Moricandia DC. 



Petals yellowish. Stigmatic lobes short or imperceptible. Seeds in a 

 single row, oblong. Cot3dedons convex. Leaves undivided. — Species 

 I. 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. " Winter- 

 cress." 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 iV. officinale 

 R. Br., watercress) yield salad, condiments, and medicaments. (In- 

 cluding Roripa Scop.) Nasturtium R. Br. 



71. Cotyledons not folded. Fruit not beaked : valves with i — 3 strong ribs. 



Glands confluent into a ring 72 



Cotyledons folded. Fruit usually beaked 73 



72. Style-apex tnmcate beneath the stigma. Seeds striate. Petals white. 



Leaves broad-cordate, toothed. — Species i. North-west Africa. 

 Used medicinally. (Under Sisymhrium L.) . . AUiaria Adans. 



