54 CRUCfFERiE 



cal leaves pinnatifid with narrow segments ; caulirie leaves linear, 

 entire ; petals absent ; stamens 2 ; pod oval, notched, winged at 

 the top. — Waste places near the sea ; uncommon. — Fl. May, June. 

 Annual. 



3.'^ L. sativum (Common Cress). — A similar plant, occurring 

 as an escape from cultivation ; pod more completely winged. 

 Annual. 



*■* Style distinct 

 4. Z. campestre (Field Pepperwort). — Pubescent; stem 16—18 

 in. high, erect, slightly branched ; leaves hoary, upper ones arrow- 



LEPIDIUM camp6str6 {Field Pepperwort). 



shaped at the base ; atithers yellow ; pod rough with minute 

 scales ; style not longer than the notch in the pod. A common 

 weed. — Fl. May — August. Annual or biennial. 



5. Z. heterophyllu?7i (Hairy Pepperwort). — More downy, more 

 woody, and more branched ; anthers violet ; pod less scaly ; style 

 much longer than the notch. As common as Z. campestre. — Fl. 

 April — August. Perennial. 



6.* Z. Drdba. — Stem flexuous, leafy, a foot in height, 

 branched ; leaves hoary, oblong, lower ones stalked, upper o?ies arrow- 

 shaped at the base ; flowers many, small, corymbose, long-stalked ; 

 pod cordate, constricted between the valves ; valves swollen ; 

 style slender. Not indigenous. — Fl. May — June. Perennial. 



24. Thlaspi (Penny Cress). — Glabrous herbs; radical leaves 

 rosulate ; cauline leaves sessile, sagittate ; flowers small, white ; 



