88. CRUCIFERAE 217 



9. Longer filaments united to the top. Sepals connivcnt. Petals linear, 

 white or pink. Seeds minute, in two rows. Bracts leaf-like. Leaves 

 divided into narrow segments. — Species i. North-east Africa (Egypt). 



Leptaleum DC. 

 Longer filaments free or slightly cohering 10 



10. Seeds thick ; radicle incumbent. Fruit-valves more or less convex. 



Petals white or pink. — Species lo. North Africa. Some are used as 



ornamental plants. (Including Maresm Pomel). . . Malcolmia R.Br. 



Seeds flat ; radicle accumbent ii 



11. Fruit-valves convex, with a faint middle-nerve, constricted between 



the seeds. Sepals saccate at the base. Petals pink. Hairs stellate. — 

 Species 3. North Africa. (Under Farsetia Desv. or Malcolmia R. Br.). 



Eremobium Boiss. 

 Fruit-valv;;s flat, sometimes keeled 12 



12. Fruit-valves projecting inwards between the seeds, thick, obtusely angled. 



Stigma acutely 2-lobed. Sepals erect. Petals pink. — Species 3. 



North and East Africa Morettia DC. 



Fruit-valves not projecting between the seeds 13 



13. Petals purple, narrow. Sepals erect, not saccate. Stigma acutely 2-lobed. 



Seeds winged. Leaves narrow. Hairs 2-cleft. — Species 13. East 

 and North Africa. Some are used medicinally. . . Farsetia Desv. 

 Petals white, rarely \'ello\\ish, reddish, or bluish. Fruit-valves with a 

 faint middle-nerve. Seeds in one row. — Species 15. North, East, and 

 South Africa. Some are used as ornamental plants. " Rock-cress." 



Arabis L. 



14. (7.) Median glands 4. Style 2-lobed ; stigma dilated, not sharply limited. 



Fruit-valves convex or keeled 15 



Median glands 2, usually confluent with the lateral one> into a ring. 

 Style short, truncate or somewhat depressed at the apex ; stigma 

 usually sharply limited 16 



15. Seeds flat ; radicle accumbent. — Species 4. North Africa. Used as 



ornamental plants or in medicine. "Wallflower." (Including Di- 



chroanthiis Webb) Cheiranthus L. 



Seeds thick; radicle incumbent. — Species 5. North Africa to Abyssinia. 

 Some are used as ornamental plants or in medicine. Erysimum L. 



16. Partition of the fruit with two bundles of fibres ; valves with a strong 



midrib. Radicle incumbent. Petals 3-ellow. Leaves pinnatipartite. 

 — Species 4. North Africa to Abyssinia. (Under Sisymbrium L.). 



Descurainia \\'ebb & Berth. 



Partition of the fruit without bundles of fibres. Petals white, rarely 



yellowish, reddish, or bluish. 17 



17. Fruit-valves flat, with a faint middle-nerve. Seeds in one row ; radic e 



accumbent. (See 13.) Arabis L. 



Fruit-valves more or less convex, with a strong middle-nerve. ... 18 



