ORDER XIII. — cruciferj:. 227 



1. S. nigra, (I*) Lower leaves large, lyrate, scabrous; upper ones 

 lanceolate, entire, glabrou?. Sepal* colored. Petals obovate, unguic- 

 ulate. SUique appressed, about three quarters of an inch Ion., 

 brous. — Yellow. £;. June. Introduced Black Mi 



Tlie seeds of the 5. nicrra (common mustard) are too extensively known ai 



tand a notice of their properties here. Tiiere are circumstances connected with 

 the exhibition of their well-known properties, which ire singular anil interesting. 

 Then: ■ dry state, maybe ; an oi!, 



ring none of the active properties of mustard, these remaining in t 

 if the oil be obtained by water, it i< powerful in its operation, producing speedy ve- 

 sication. This latter oi! ir - formed in the seed, but is 

 by the action of the water. The chemical difference of the two is. probably, I 

 latter contains sulphur, as this is found in the white mustard in a principle called 

 --inapt-sin. possessing the same properties as this oil, and lonned by the action 

 of water. 



Genus XL— RAPH'AXUS. L. U— 2. 



(From the Greek raphanis, to appear quickly : from the rapid germination of the 



seed.) 



Calyx closed. SiUque transversely many-celled. Seeds in 



one row. Flowers in racemes, opposite the leaves. 



R. sati'yus, (L.) Pods terete, pointed. Pools more or less fleshy, of 

 various forms. — G. Asia. Radish. 



Genus XII— DRA'BA. L. 14—1. 

 (From the Greek draoa, acrid.) 



Silicle oblong-lanceolate or oval, minutely hispid, especially 

 along the margin, or glabrous. Seeds numerous. Calyx equal. 

 Petals emarginate or entire. 



1. D. cuxeifo'lia. (Xutt.) Stem leafy at the lower part, very pu- 

 bescent, slender. Leaves with few teeth; cauline ones oblong-ovate, 

 narrowed at the base ; radical ones spatulate-oblong. Flowers large ; 

 petals several times the length of the calyx. — White. @. Florida. 

 4 — S inches. 



*. D. Carolinia'na, (Walt.) Stem leafy and hispid at the base, na- 

 ked and smooth above. Leaves hispid, entire. Flowers coryiubic or 

 racemed ; petals oblong, twice as long as the sepals, or minute, and 

 sometimes wanting. Silicle nearly linear, glabrous, 4 — 6 lines long, 

 many-seeded. — White. <£. April and June. Mid. Geo. 1 — 6 inches. 



3. D. bsachycaii'pa, (Xutt.) Stem simple or branched, leafy. Leaves, 

 cauline ones linear or oblong, with 2 or 3 minute teeth or entire ; radi- 

 cal ones roundish-ovate, petioled. Flowers in racemes, many-flowered; 

 Bilielea oval, glabrous, cells 5 — G seeded; petals entire or slightly emar- 

 ginate. 



Var. fa-xigia'ta, (Xutt.) Stem more pubescent, seldom branched , 

 radical leaves generally 4-toothsd, silicle pubescent. — White. 0. 

 March — April Middle Georgia. 



Genus XIII.— COROXO'PUS. L. 14—1. (Seneblera.) 

 (From the Greek korone, a crow, and pous, a foot.) 



Silicle reniturm, didymous, compressed contrary to the sep- 



