TETRADYNAMIA. SILK^UOSA. 6? 



Stigma entire. Calix partly gaping-. « A gland 

 situated between each of tiie shorter stamina 

 and the calix.'* Smitii*. 



Leaves s>imple, ternate, pinnatifid or imperfectly pin- 

 nate. In some of the species there is occisionully an abor- 

 tion of petals or of 2 of the stamina. 



Species. 1. C spaihulata. 2- teres, o. virginica. A- 

 iinifio'^a. 5. pennsylvanica- 6. pratensis. In Labrador. 7- 

 mnltifida. Ph. Leaves tripinnatifid, silique short. A Si- 

 symbrium? 



Within its natural limits almost exclusively an Euro- 

 pean genus. 



459. BARBAREA. 72. Brown, Erysimum, X. 



" >S^iZigite4-si(led-ancipital. Cotyledones ac- 

 cuinbent. ^eeJs in a single series. Calix erect. 

 Glands disposed at the internal base of the shor- 

 ter filaments." R. Brown. Hort. Kew. 4. p. 

 109. 



Leaves iyrately pinnatifid; stem branched; flowers yel- 

 low, terminally racemose. 



Species. l.B.vul^^aris. Erysimnm Barharea. L. Hab. 

 Apparently indigenous in ;he northern states. This spe- 

 cies, called " Yellow Rocket," affords a fine double flow- 

 ered variety.— Of this genus there is only a second species 

 and both are indigenous to Europe. 



460. SISYMBRIUM. L. (Water Cress. Water 



Radish.) 

 Silique terminated by a short terete rostrum, 

 valves nearly straight, not elastic. Calix and 

 corolla spreading. 



Leaves mostly pinnatifid, pseudopinnate, or compound- 

 ed; flowers axillary and solitary, but more commonly in 

 simple or paniculated racemes. Silique ovate, in 5. am' 

 phibiiim almost similar to the silicle of some species of 

 Cochleana, in many others also short. Flowers often yel- 

 low. 



Spbcies. 1. S. JVasturtium. Truly indigenous. Abun- 

 dant on the margins of ditches and spongy springs in 

 Long Isla,nd near New York, &c. 2. palnstre. o^amp/a-^ 



