150 CRUCIFERAE 



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

 ton ; Bucks ; PhiIvAdelphia. 



2. Rorlpa palustris (L. ) Bess. Marsh or Yellow Water-cress. 

 (Man. p. 452 ; I. F. f. ijij. ) In wet places, nearly throughout N. Am. 

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

 Bucks ; Philadelphia ; Chester ; Lancaster ; Columbia ; Hunt- 

 ingdon ; Erie ; Delaware ; Allegheny. 



3. Roripa hispida (Desv. ) Britton. Hispid Yellow-crESS. (Man. 

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

 — Pennsylvania : Northampton ; Bucks ; Philadelphia ; Lancaster ; 

 Dauphin ; Franklin ; Huntingdon. 



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

 I. F.y. 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; Northampton; Bucks; Berks; 

 Franklin ; Erie. 



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

 p. 453; I. F. f. 1722.) Escaped into moist grounds. Adv. from Eu. — 

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

 ingdon ; Lancaster ; Franklin ; Delaware ; Allegheny. 



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

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

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



7. SISYMBRIUM L. 



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



I. S. officinale. 

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



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

 448; I. F.y. 1696.) In waste places throughout northeastern U. S. Nat. 

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

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

 Allegheny. 



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

 I. F. /. 1697.) 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 pinnatifidus (Michx.) Steud. Purple or False 

 Rocket. (Man. p. 451 ; I. F./. J 712.) On river banks, western Pa. to 

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



9. HESPERIS L. 

 1. Hesperis matroualis L. Dame's Rocket or Violet. (Man. p. 

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

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

 Bucks ; Lancaster ; Allegheny. 



