i6o 



CRUCIFERAE. 



Vol. II. 



I- Radicula sylvestris (L.) Druce. Creep- 

 ing Yellow Water-cress, Fig. 2026. 



Sisymbrium sylvestre L. Sp. PI. 657. 1753. 

 Nasturtium sylvestre R, Br, in Ait. Hort. Kew. Ed. 2, 



4 ; 1 10, 1812. 

 Roripa sylvestris Bess. Enum. 2y. 1821. 

 Radicula sylvestris Druce, List Brit. Plants 4. 1908. 



Perennial, glabrous ; stems creeping, branches 

 ascending. Leaves pinnately divided or deeply 

 pinnatifid, petioled, 3'-s' long, i'-2' broad, ovate 

 in outline, the divisions obovate, or oblong, toothed 

 or lobed, the terminal one often somewhat larger 

 than the lateral; pedicels slender, 3" long; flovi'- 

 ers yellow, 3"-4" broad; pod linear, 4,"-6" long; 

 style very short. 



In wet grounds and waste places, Newfoundland 

 to Ontario, Virginia and Michigan. Adventive or 

 naturalized from Europe. Native also of northern 

 Asia. Yellow-cress. Summer. 



2. Radicula sinuata (Nutt.) Greene. 

 Spreading Yellow-cress. Fig. 2027. 



Nasturtium sinuatum Nutt. ; T. & G. Fl. N. A. I : 



7i. 1838. 

 Roripa sinuata A. S. Hitchcock, Spring FI. Man- 

 hattan 18. 1894. 

 Radicula sinuata Greene, Leaflets i : 113. 1905. 



Perennial, dififuse, glabrous, the branches 

 ascending. Leaves oblong, lanceolate, or 

 oblanceolate, 2-3' long, i'-l' wide, pinnatifid, 

 the lobes linear or oblong, obtuse, entire, or 

 sparingly dentate; pedicels slender, 3" long; 

 flowers yellow, about 2" broad; pods linear- 

 oblong, sometimes slightly curved, smooth or 

 a little roughened, 4"-6" long; style slender, 

 i"-i2" long. 



In dry or moist sandy soil, Illinois and Minne- 

 sota to Assiniboia, Washington, Missouri, Texas 

 and Arizona. St. Thomas, Canada. June-Sept. 

 Has been mistaken for R. curvisiliqua (Hook.) 

 Greene. 



3. Radicula obtiisa (Nutt.) Greene, 



Blunt-leaved Yellow-cress. 



Fig. 2028. 



Nasturtium obtusum Nutt.; T. & G. FI. N. A. I : 



74. 1838. 

 Roripa obtusa Britton, Mem. Torr. Club 5: 169. 



1894. 

 Radicula obtusa Greene, Leaflets, i: 113, 1905. 



Annual or biennial, diffuse, much-branched, 

 the branches ascending or erect. Leaves ob- 

 long or oblanceolate, 2'-4' long, pinnately di- 

 vided, or pinnatifid, the lobes obtuse, repand- 

 toothed, or sometimes entire; pedicels i"-2" 

 long; flowers yellow, i" broad or less; pods 

 narrowly oblong, or linear, 3"-s" long, ascend- 

 ing; style *" long. 



In low grounds, Michigan to Missouri, Texas, 

 Montana and California. April-Aug, 



