254 Class XV. Order II. 



and ending in yellow flowers. About rubbish and cultivated 

 ground. All summer. Annual. 



2-73. SINAPIS. 

 SINAPIS NIGRA. L. Common Mustard. 



Pods smooth, four cornered, pressed close to the 

 raceme ; upper leaves linear-lanceolate, entire, smooth. 

 Sin. 



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. 



274. DENTARIA. 

 DENTARIA LACINIATA. Willd. Toothwort. 



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

 long, cut-toothed ; root moniliform. 



Syn. DENTARIA CONCATENATE. MX. 



Root formed of a sti'ing of tubers. Stem about a foot high, 

 giving off three leaves near together at its upper part. These 

 are deeply divided into three segments or leafets which are ob- 

 long, divergent, cut and toothed. Flowers large, purplish, in a 

 terminal raceme. Woods, Hampshire. June. Perennial. 



275. CLEOME. 

 CLEOME DODECANDRA. L. Cleome. 



Leaves ternate, elliptical ; flowers axillary, solitary, 

 dodecandrous. 



A viscid, strong scented plant. Stem branching, pubescent 

 and glutinous. Leaves petioled, ternate ; leafets oblong-spatu- 

 late, smooth. Flowers racemed, white, with ten or a dozen 

 stamens. Pods lanceolate, turg'id, hairy and viscid, two valved 

 without a dissepiment. On the shores of lake Champlain, near 

 Burlington. July. Annual. 



