KEY. 131 



107. Pods from nearly as long as wide to not more than 

 4 times as long as wide; silicles. Valves in one genus inde- 

 hiscent 108 



Pods elongated so much as to he at least 4 to 6 

 times as long as wide ; siliques 116 



108. Silicle turgid or flattened, with a broad parti- 

 tion (the latter rarely incomplete) 109 



Silicle flattened contrary to the narrow parti- 

 tion 114 



109. Flowers white, one case excepted, in which, how- 

 ever, the seeds are 2-rowed in each cell, and the petals emar- 

 ginate 110 



Flowers yellow 112 



110. Seeds 2-rowed in each cell. Cotyledons (0=). 

 Petals entire or 2-cleft. Silicle oval, oblong, or even linear. 

 Flowers only in one species yellow. Leaves simple> entire, 

 or toothed. JDraba. 



Seeds not 2-rowed. Silicles ovoid or globular. ..Ill 



111. Silicle 2-celled, several-seeded, oval ; valves turgid. 

 Cotyledons incumbently folded on themselves. Dwarf. 

 Leaves awl-shaped, tufted. Flowers minute. 



Subularia aquatica, L. 



Silicle 1 -celled, from the insufficiency of the parti- 

 tion, ovoid or globular. Cotyl. (0=). Leaves vmdivided, or 

 the lower pinnatifid. Armoracia, Rupp. 



{Ifasturtium, Gr.) 



112. Seeds 2-rowed in each cell. Cotyl. (Q=). Silicles 

 oblong. Flowers usually small or minute. 



Nastiirtium, R. Br. (117). 



Seeds not 2-rowed 113 



113. Valves convex, l-nerved. Silicle turgid, obovoid, 

 or pear-shaped, surrounded by a flat, sharp margin, pointed, 

 many-seeded. Cotyl. (0||). On dehiscence, the style is 

 split, and its halves are left on the valves. Leaves lanceo- 

 late, sagittate at the base, nearly entire. Flowers small. 



Cameliua sativa, Crantz. 



I 



