CLASS XV. ORDER II. 271 



Stem erect, furrowed, hairy when out of water. Leaves hairy 

 clasping at base, lyrate or pinnatifid, toothed. Flowers in ter- 

 minal racemes, small, yellow. Fruit oblong-oval, swelling, 

 compressed, obtuse at both ends, tipt with the style, supported 

 by slender, spreading pedicels. — Ponds and wet places, the lower 

 leaves sometimes capillary. — July. — Perennial. 



294. ERYSIMUM. 

 Erysimum officinale. L. Hedge 3fustard. 



Pods pressed close to the main stalk ; leaves runci- 

 nate. L. 



The whole plant is more or less hairy, and attains the height 

 of about two feet. Stem round ; branches given off at a large 

 angle, and curving. Leaves lyrate-runcinate. The fruitful 

 branches are long and slender, covered with close, sessile pods, 

 and ending in yellow flowers. — About rubbish and cultivated 

 ground. — All summer. — Annual. 



295. SINAPIS. 

 SiiXAPis NIGRA. L. Common Blustard. 



Pods smooth, four cornered, pressed close to the 

 raceme; upper leaves linear-lanceolatCj entire, smooth. 

 Srn. 



Very common in cultivated and waste grounds ; usually re- 

 garded as a weed, though its seeds furnish the common table 

 mustard. Stem round, striated, smooth, three or four feet high, 

 branching. Leaves variously lobed and toothed, the lower ones 

 rough, upper ones smooth, deflexed, the highest narrow, small, 

 entire. Flowers numerous and showy. Calyx and corolla yel- 

 low. Pods erect, close to the stalk, quadrangular, ending in a 

 short beak. — June, July. — Annual. 



296. DENTARIA. 

 Dentaria laciniata. Wind. Toothwort. 



Leaves three, three parted, the divisions linear-ob- 

 long, cnt-toothed ; root moniliform. 



