CRUCIFERAE 149 



4. Lepidium Virginicum L- Wild Pepper-grass. (Man. p. 446 ; I. 

 F. f. 1687.) In fields and along roadsides, Quebec to Minn., Fla., Tex. 

 andMex. — Pennsylvania : Monroe; Northampton ; Bucks ; Chester; 

 Delaware ; Allegheny. 



5. Lepidium apetalum Willd. Apetalous Pepper-grass. (Man. p. 

 446 ; I. F./ /6SS.) In dry soil, Me. and Ont. to Calif., Tex. Apparently 

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

 phia. 



6. Lepidium sativum L. Garden OR Town Pepper-grass. (Man. 

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

 ofEu. — Pennsylvattia : Philadelphia; Franklin. 



4. THLASPI L. 

 1. Thlaspi arvense L. Field Penny-cress. (Man. p. 447 ; I. 'P.J. 

 i6g2. ) 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. — Pemisylvania : Philadelphia ; Lancaster. 



5. CAMELINA Crantz. 

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



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



1. Camelina sativa (L.) Crantz. Gold-of-pleasure. False-flax. 

 (Man. p. 459; I. F. /. 1733.) In fields and waste places throughout 

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

 Franklin ; Huntingdon ; Delaware ; Chester. 



2. Camelina microcarpa Andrz. Small-fruited False-flax. 

 (Man. p. 459 ; I. F. y. 1733a.) In waste places, R. I. to B. C. and Tenu. 

 Nat. or adv. from 'En.— Pennsylvania : Northampton; Delaware; 

 Franklin. 



6. RORIPA Scop. 

 Corolla yellow. 

 Plants perennial by creeping or horizontal stems : petals mostly surpassing 



the sepals. i. R. sylvesiris. 



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. palusiris. 



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, pinnatifid, dissected or the upper ones merely toothed : 

 pods oblong to globose. 

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



5. R. Arnioracia. 

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

 dissected. 6. R. Americana. 



1. Roripa sylveatris (L. ) Bess. Creeping Yellow W'aTER-cress. 

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



