250 Class XV. Order L 



TETRADYNAMIA. 

 SIL1CULOSA. 



264. DRABA. 

 DRABA VERNA. L. Whitlow Grass. 



Scape naked ; leaves oblong, acute, subserrate, hai- 

 ry ; petals bifid ; stigma sessile. 



A small, very early, white flowering plant. Leaves all radi- 

 cal. Scape two or three inches high with a raceme of small 

 flowers. Calyx spreading; petals half cleft. Pod oval, flat. 

 Among the grass in fields, &,c. in the southern parts of the state- 

 Not seen near Boston. April, May. 



265. LEPIDIUM. 



LEPIDUM VIRGINICUM. L. Wild Cress or Peppergrass, 



Radical leaves pinnatifid ; stem leaves linear-lanceo- 

 late, serrate ; flowers with four petals and two stamens ; 

 silicic lenticular. Mich abr. 



Syn. THLASPI VIRGIN JANUM. Poir. 



Frequent by road sides, flowering during' most of the summer 

 and autumn. Stem woody and branching, round, smooth. Branch- 

 es numerous, alternate. Leaves of the root pinnatifid, of the 

 stem lanceolate, glabrous, furnished with a remote tooth or two. 

 Racemes terminal, long, naked. Pedicels capillary. Flowers 

 very small, diandrous, white. Silicles llat, orbicular, with a 

 deep notch in the end. Taste like common Garden cress or 

 peppergrass. 



266. THLASPI. 



THLASPI BURSA PASTORIS. L. Common Shepherd's Purse. 

 Hairy, silicle inversely heart shaped, somewhat tri- 

 angular ; radical leaves pinnatifid. Sm. 



Equally common with the last, in pastures and road sides, con- 

 tinuing to flower during most of the vegetating season. Stem 

 branching, round. Root leaves numerous, spreading, pinnatilld, 

 toothed, somewhat hairy. Stem leaves oblong, toothed, arrow 



