CL. XV.] TETRADYNAMIA SILICULOSA. 267 



6. LEPl'DIUM. PEPPER-WORT. 



Calyx of four egg-shaped, concave, deciduous leaves. Petals 

 inversely egg-shaped, undivided, with narrow claws. Filaments 

 awl-shaped, as long as the calyx ; anthers two-lobed. Germen 

 roundish. Style slender ; stigma obtuse. Pouch round or oblong, 

 compressed, notched at the top, two-celled ; the valves keel-shaped ; 

 partition very narrow, crossing the greater diameter of the pouch. 

 Seeds one in each cell, egg-shaped. Named from lepis, a 

 scale. 319. 



1. L. latifolium. Broad-leaved Pepper-wort. Leaves between lance- 

 shaped and egg-shaped, undivided, serrate. Stems three feet high, 



branched : flowers numerous, very small, white, in compound leafy 

 panicled clusters. Perennial : flowers in July : grows in marshes and 

 meadows near the sea : rare. Eng. Bot. vol. iii. pi. 182. Eng. FL vol. iii. 

 p. 165. 938. 



2. L. Drdba. Whitlow Pepper-wort. Leaves lance-shaped, clasping 



the stem. About a foot high, with large, distant leaves, and corymbs 



of numerous white flowers: pouch heart-shaped, with the style about its 

 own length. Perennial : flowers in June : grows in fields and hedges in 

 several places in the south of England, where it has been naturalized. 

 Eng. Bot. Suppl. pi. 2683. Brit. FL 4th ed. p. 247. 939. 



3. L. ruderdle. Narrow-leaved Pepper-wort. Lower leaves pinnatifid, 



toothed ; upper linear, entire ; stamens two ; petals none. The whole 



plant smooth, glaucous : stem about ten inches high : flowers sometimes 

 have the petals. Annual : flowers in June : grows in waste ground : 

 frequent. Eng. But. vol. xxiii. pi. 1595. Eng. Fl. vol. iii. p. 166. 940. 



4. L. campestre. Mithridate Pepper-wort. Pouch covered with minute 

 scales, notched, bordered at the top ; style very short ; stem-leaves arrow- 

 shaped, toothed. More or less downy and glaucous : lowest leaves in- 

 versely egg-shaped : flowers numerous, small, white, corymbose. Annual : 

 flowers in July: grows in cultivated fields: frequent. Eng. Bot. vol. xx. 

 pi. 1385 : Thtaspi campeitrc. Eng. Ft. vol. iii. p. 166. 941. 



5. L. Smtthii. Hairy Mithridate Mustard. Pouch egg-shaped, 

 notched, not scaly, bordered at the top ; style prominent ; stem-leaves 



arrow-shaped, toothed. Stems hairy, from six to eight inches high : 



flowers white. Perennial: flowers in June: grows on the edges of 

 fields. Eng. Bot. vol. xxvi. pi. 1803 : Lepidium hirtum. Eng. Fl. 

 vol. iii. p. 167. 942. 



7. THLA'SPI. SHEPHERD'S-PURSE. 



Calyx of four egg-shaped, concave, spreading, equal leaves. 

 Petals egg-shaped, equal, undivided, with short claws. Filaments 

 slender ; anthers heart-shaped, acute. Germen roundish, notched 

 or inversely heart-shaped. Style short ; stigma obtuse. Pouch 

 compressed, roundish or inversely heart-shaped, two-celled; valves 

 keeled, generally bordered; partition elliptical, crossing the greater 

 diameter of the pouch. Seeds egg-shaped, several in each cell. 

 Named from thlao, to flatten. 320. 



1. T.arvtnse. Mithridate Mustard. Penny-cress. Pouch round, nearly 

 flat, shorter than its stalk ; leaves smooth, oblong, toothed. About a 



