CRUCIFERAE 149 



4. Lepidium Virginicum L,. Wii,d Pepper-grass. (Man. p. 446 ; I. 

 P. f. 1687.) In fields and along roadsides, Quebec to Minn., Pla., Tex. 

 and Hex. — Pennsylvania ; Monroe; Northampton ; Bucks ; Chester; 

 Dei,aware; Ai,i<egheny. 



5. Iiepidium apetalum Willd. Apetai,ous PeppER-grass. (Man. p. 

 446 ; I. F./. 1688.) In dry soil. Me. and Ont. to Calif., Tex. Apparently 

 nat. from Eu. — Pennsylvania : Pike ; Monroe ; Bucks ; Philadei,- 

 phia. 



6. Lepidium sativum L- Garden or Town Pepper-Grass. (Man. 

 p. 446 ; I. F./. 1689.) In waste places, Quebec to Pa. and B. C. Native 

 of Eu. — Pennsylvania : PHii,ADEr,PHiA ; Frankwn. 



4. THLASPI L. 

 1. Thlaspi arvense L. FiEi,r> Penny-cress. (Man. p. 447 ; I. F./. 

 i6gz. ) In waste places and on ballast, sparingly adv. or fugitive from Eu. 

 in the Eastern and Middle States, also in Quebec, Man. and the N. W. 

 Terr. — Pennsylvania : Philadelphia ; Lancaster. 



5. CAMELINA Crantz. 



Plant glabrous or nearly so : silicles 6-8 mm. long. i. C. sativa. 



Plant pubescent : silicles 4-6 mm. long. 2. C. microcarpa. 



1. Camelina sativa (L.) Crantz. Gold-oe-plEasure. Palse-elax. 

 (Man. p. 459; I. F. /. 1753.) In fields and waste places throughout 

 northern U. S. Adv. or nat. from Eu. — Pennsylvania : Lancaster ; 

 Franklin ; Huntingdon ; Delaware ; Chester. 



2. Camellna microcarpa Andrz. Small-eruited False-Flax. 

 (Man. p. 459 ; I. F./. i^jja.) In waste places, R. I. to B. C. and Tenn. 

 Nat. or adv. from Eu. — Pennsylvania : Northampton ; Delaware ; 

 Franklin. 



6. RORIPA Scop. 

 Corolla yellow. 

 Plants perennial by creeping or horizontal stems : petals mostly surpassing 



the sepals. i. i?. sylvestris. 



Plants annual or perennial, with fibrous roots : petals mostly shorter than 

 the sepals. 

 Pods linear or narrowly oblong, as long as the pedicels or longer : stems 



glabrous or nearly so. 2. R. palustris. 



Pods subglobose or oval, shorter than the pedicels : stems pubescent. 



3. R. hispida. 

 Corolla white. 

 Leaf-blades pinnately divided : pods linear. 4. R. Nasturtium. 



Leaf-blades lobed, piunatifid, dissected or the upper ones merely toothed : 

 pods oblong to globose. 

 Species terrestrial : leaf-blades crenate, lobed or pinnatifid. 



5. R. Armor acia. 

 Species aquatic : leaf-blades, at least those of the submersed leaves, finely 

 dissected. 6. R. Americana. 



1. Rorlpa sylvestris (L.) Bess. Creeping Yellow Water-Cress. 

 (Man. p. 452; I. F. /. 1713.) In low grounds and waste places, Mass. 



