TETRADYN. SILICUL. 1'93 



19. Hksperis. PocZ 4 -sided or two-edged. Stigma nearly ses' 

 sile, with the lobes connivent. Cotyledons incumbent, plane. 

 Cal. closed. Br. 



20. Brassica. Pod 2-valved (with an abortive or 1-seeded 

 beak). Cotyledons conduplicate. Cal. closed. Br. 



21. SiNAPis. Pod 2-valved (sometimes of 2 articulations, of 

 which the upper one is valveless) . Cotyledons conduplicate. 

 Cal. patent. Br. 



22. Rai'Hanus. Po(Z valveless (torulose, Sm.). Co/7/ Worn con- 

 duplicate. Cal. closed. Br. 



1. SILICULOSA. 



1. CAKILE. 



I. C. maritima (Sea Rocket)^ articulations of the pouch two- 

 edged the upper one sagittate, leaves pinnatifid subd ntate 

 fleshy. Br. Light/, p. 363, and E. B. t. 231 {Bunias Cakile). 



Hab. Sea-shores in sandy places; not uncommon. Leith sands, &c., 

 Lightf. E. coast from Aberdeen to Fraserburgh, Mr. Murray. Ft. 

 June, July. ©. 



Plant bushy ; branches very crooked, succulent. Flowers, as in all 

 of this class, corymbose ; the corymbs in fruit lengthening into ra- 

 ^ cemes, purplish. Pouch thick, fleshy, at length somewhat woody . 



2. CRAMBE. 



1. Cr. maritima {Sea Kale), the four longer filaments forked, 

 pouch pointless, leaves roundish sinuated waved toothed glau- 

 cous and as well as the stem glabrous. Br. Lightf. p. 364. 

 £.5./. 924. 



Hab. Sea-coast in sandy or stony soils, but not common. Near 

 Fast-castle, Berwickshire, Lightf. Isle of Isla, Dr. Walker. Ft. 

 June. 1/. 



Root thick, fleshy. Leaves large. Flowers white. Well known in a 

 cultivated state ; but rare, in Scotland, wild. 



3. CORONOPUS. 



1. C. Ruellii (Swine's Cress), pouch undivided crested with lit- 

 tle sharp points. Br. Light/, p. 345 (Cochlearia Coronopus) . 

 £. 5.M660. 



Hab. Moist, clayey, exposed situations by road-sides, but not com- 

 mon, Sibhald. Road-side VV. of Tobago-street, Edinb. ; at Burnt- 

 island, and at Seton Harbour, Maugh. Musselburgh, Mr. Arnott. 

 Ft. Aug. O . 



A much-branched, spreading weed. Leaves bipinnate, the segments 

 linear. Flowers very small, white, in lateral axillary cor?//?; 6s. Pouch 

 large in proportion to the flower, curiously crested. 



4. THLASPI. 

 1. Th. arvense (smooth Mithridate Mustard, or Penny-Cress) , 



