150 CRUCIKERAB 



to Va. and Ohio. Adv. or nat. from Eu. — Pennsylvania : Northamp- 

 ton ; Bucks ; Philadelphia. 



2. Roiipa palustris (L.) Bess. Marsh or Yellow WaTER-crbss. 

 (Man. p. 452 ; I. F. /. 1717-) In wet places, nearly throughout N. Am. 

 except the extreme north. Also in Eu. — Pennsylvania : Northampton ; 

 Bucks ; Philadelphia ; Chester ; IvANCaster ; Columbia ; Hunt- 

 ingdon ; Erib ; DELAWARE ; Allegheny. 



3. Roripa bispida (Desv. ) Britton. Hispid YELLOW- CRESS. (Man. 

 p. 453 ; I. F. /. 17/S.) In wet places, N. B. to B. C, Fla. and N. Mex. 

 —Pennsylvania : Northampton ; Bucks ; Philadelphia ; Lancaster ; 

 Dauphin ; Franklin ; Huntingdon. 



4. Roripa Nasturtium (Iv.) Rusby. WaTER-CRESS. (Man. p. 453; 

 l.'P.f. 1721.) In brooks and streams, N. S. to Man., Va. and Mo. Nat. 

 from Eu. Native also of northern Asia, introd. into S. Am. and western 

 N. Am. — Pennsylvania : Monroe ; NortpampTon ; Bucks ; Berks ; 

 Franklin ; Erie. 



5. Roripa Armoracla (L.) A. S. Hitchcock. Horseradish. (Man. 

 p. 453 ; I. F. yi 17^^-) Escaped into moist grounds. Adv. from Eu. — 

 Pennsylvania : Monroe ; Northampton ; Bucks ; Chester ; Hunt- 

 ingdon ; Lancaster ; Franklin ; Delaware ; Allegheny. 



6. Roilpa Americana (A. Gray) Britton. Lake WaTER-CRESS. 

 (Man. p. 453 ; I. F. /. 1723.) In lakes and slow streams, Vt. to Fla. and 

 La., from western Quebec to Minn. — Pennsylvania : Philadelphia. 



7. SISYMBRIITM L. 



Corolla yellow : pods appressed to the rachis, 1-1.5 cm. long. 



1. 5. officinale. 

 Corolla cream-colored : pods spreading, 5-10 cm. long. 2. S. altissimum. 



1. Sisymbrium oEScinale (L.) Scop. Hedge Mustard. (Man. p. 

 448; I. F._/ j6g6.^ In waste places throughout northeastern U. S. Nat. 

 from Eu. Native also of northern Asia. — Pennsylvania : Monroe ; 

 Northampton; Bucks; Chester ; Franklin ; Erie; Delaware; 

 Allegheny. 



2. Sisymbrium altissimum L. Tall Sisymbrium. (Man. p. 448; 

 I. F. y. /6p7. ) In waste places, Quebec to Alberta, N. Y. and Mo. Adv. 

 from Eu. — Pennsylvania : Northampton, Bethlehem ; Bucks ; Phila- 

 delphia. 



8. lODANTHUS T. & G. 

 1. lodanthus plnnatifidus (Michx.) Steud. PURPLE OR FALSE 

 Rocket. (Man. p. 451 ; I. F./. 7712.) On river banks, western Pa. to 

 Minn., Ky., La. and Tex. — Pennsylvania : Allegheny. 



9. HESPERIS L. 

 1. Hesperls matronalis L- Dame's Rocket or Violet. (Man. p. 

 467 ; I. F.y. 1790.) In fields and along roadsides, escaped, Mass. to Pa. 

 and Iowa. Nat. of Eu. and Asia. — Pennsylvania : Northampton ; 

 Bucks ; Lancaster ; Allegheny. 



