5. CRUCIFERAE 



219 



27. Fruit-valves boat-shaped, laterally compressed ; partition narrow. Stigma 



sessile. Seeds 4. — Species 2. North Africa. (Including Hinter- 



hubera Reichb. and Hormwgia Reichb.) .... Hutchinsia R. Br. 



Fruit-valves flat or convex, dorsally or not compressed ; partition 



broad 28 



28. Fruit-valves strongly convex ; partition thick, woody. Fruit elliptical, 



tapering into the style. Seeds 2. Median glands wanting. Flowers 

 short-stalked. — - Species i. North-west Africa (Algeria). 



Euclidium R. Br. 

 Fruit-valves flat or slightly convex ; partition thin, membranous. . . 29 



29. Median glands wanting. Partition of the fruit without fibres. Fruit 



orbicular. Spinous undershrubs. — Species i. North-west Africa. 



(Under Alyssum L.) Ptilotrichum C. A. Mey. 



Median and lateral glands present. Partition of the fruit with scattered 

 fibres. — Species 6. North and South Africa, Cape Verde Islands, and 

 St. Helena. Some are used as ornamental or medicinal plants. {Koniga 

 Adans., under Alyssum L.) Lobularia Desv. 



30. Petals yellow 31 



Petals white or red 34 



31. Sepals, at least the lateral, saccate at the base. Shorter filaments with a tooth- 



like appendage. Fruit elliptical, flat. Seeds numerous, winged. — • 

 Species i. North-east Africa (Egypt). (Under Far sella Desv.) 



Fibigia Medik. 

 Sepals not saccate 32 



32. Filaments, at least some of them, with an appendage, more rarely without, 



but then, as usually, seeds 2 — 8. Fruit-valves marked with a mid-rib at 



the base. (See 25.) Alyssum L. 



Filaments without an appendage. Seeds 10 or more. Fruit-valves with 

 the mid-rib extending to the top 33 



33. Fruit ovate or elliptical, with rather flat valves and a faint middle-nerve. 



Radicle accumbent. — Species 5. North-west Africa. Some are 

 used as ornamental or medicinal plants. (Including Erophila DC.) 



Draba L. 

 Fruit obovate or pear-shaped, with very convex valves and a strong middle- 

 nerve. Radicle incumbent. Leaves sagittate. — Species 3. North 

 Africa. They yield oil and medicaments. . . . Camelina Crantz 



34. Petals red. Stigma 2-cleft. Seeds winged. Hairs 2-cleft. (See 13.). 



Farsetia Turr. 

 Petals white. Stigma entire or notched. Seeds not winged. . • • 35 



35. Valves of the fruit flat or slightl}^ convex, with a faint middle-nerve ; 



partition broad. Radicle accumbent. Leaves undivided. (See 33.) 



Draba L. 

 Valves of the fruit boat-shaped ; partition narrow. Radicle incumbent. 36 



