r\L,UHA UJ? rJBiAAJJ. 



SISYMBRIUM. Hedge Mustard. 



Silique linear or oblong, terete or somewhat angled, with 

 1-3 nerved valves. Seeds in a single row in each cell, ob- 

 long, marginless. Cotyledons linear-oblong, incumbent. 

 Herbs with simple or pinnately divided leaves. Floivers 

 in racemes, small, white or yellow. 



S. CANESCENS, Nutt. Pubescent and somewhat hoary ; 

 stem, simple or sparingly branched ; leaves bipinnatifid, 

 with small mostly toothed lobes ; racemes at length elon* 

 gated ; siliqiie shorter than the spreading pedicel. March, 

 April. Ste7n l°-2° high. Floiuers small, greenish white. 



DRABA, L. Whitlow Grass. 



Silicle oblong or oval, flattened parallel with the broad 

 partition. Seeds numerous in two rows in each cell, com- 

 pressed, wingless. Cotyledons accumbent. Small herbSy 

 with entire or toothed leaves, and yellow or white flowers 

 in terminal racemes. 



§ Petals entire. 

 § Petals 2-deft. 



D. BRACHYCARPA, Nutt. Annual ; minutely downy ; 

 ste?n leafy, simple or branched ; radical leaves round-ovate, 

 stalked ; those of the stem oblong-linear ; silicle oval, as 

 long as the pedicel. Stein 1-3' high. Silicle 4"-6" long. 

 Floivers white. March, April. 



D. Carolinian'A, Walt. Annual ; stems leafy and hispid 

 at the base, smooth above ; leaves tufted, spatulate-obovate, 

 hispid ; silicle linear-oblong, two or tliree times as long as 

 the pedicel. February- April. Ste?7is 1-3' high; silicle 

 4"-6" long. Floivers white. 



D. CUNEIFOLIA, Nutt. Annual. Xeat^es obovate, wedge- 

 shaped, or the lowest spatulate, toothed ; raceme somewhat 

 elongated, in fruit 1-3' long, and at length equaling the 



