TETRADYNAMIA, SILIQUOSA. 53 
I 298. THLASPI. Gen.pl. 1078. {Cruciferx.) 
' Silicle emarginate, obcordate, many seeded : 
i! valves navicular, with a carinate margin. — 
I J\Tutt. 
I 1. T. hirsute, silicle deltoid-obcordate, radical 
I leaves pinnatifid. — W'illd. 
I Icon. Engl. Bot. 1485. 
I Shepherd’’ s Purse. 
j| , One of the common weeds growing every where, even in 
I the crevices of brick pavements. It sometimes covers whole 
fields. The young radical leaves are brought to market and 
sold for greens, in the spring of the year. Annual. From April 
till October. 
ORDER II. SILIQUOSA. 
299. DENTAKIA. Gen. pi. 1087. {Crucifera.) 
Silique springing open elastically and the 
valves nerveless’’ and revolute. Dissepi- 
ment partly fungose. Stigma emarginate. 
Calix longitudinally connivent. — J^utt. 
1. D. leaves thrice ternate, folioles tripartile-li- laeiniata. 
near-oblong, cut-dentate; roots tuberous, mo- 
niliform. — TVilld. 
D. concatenata, Mich. 
Jagged-leaved Tooth-wort. 
A handsome plant, near a foot high. Flowers pale-purple 
and white. On the shady hilly woods bordering the Schuyl- 
kill, near the falls, particularly on rocks ; also, on the rocky 
banks af the Wissahickon, very common. Perennial. May. 
YOI.. II, 6 
