i6o 



CRUCIFERAE. 



VOL. If 



i. Radicula sylvestris (L.) Druce. 



ing Yellow Water-cress. Fig. 2026. 



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

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



4: no. 1812. 



Roripa sylvestris Bess. Enum. 27. 1821. 

 Radicula sylvestris Druce, List Brit. Plants 4. n,o 



Perennial, glabrous ; stems creeping, branc'.u 

 ascending. Leaves pinnately divided or deep) 

 pinnatifid, petioled, 3 '-5' long, 1-2' broad, oval 

 in outline, the divisions obovate, or oblong, toothe 

 or lobed, the terminal one often somewhat ' 

 than the lateral; pedicels slender, 3" long; flo\\ 

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

 style very short. 



In wet grounds and waste places, Newfoundlan 

 to Ontario, Virginia and Michigan. Adventive o 

 naturalized from Europe. Native also of norther 

 Asia. Yellow-cress. Summer. 



2. Radicula sinuata (Nutt.) Greene. 

 Spreading Yellow-cress. Fig. 2027. 



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



73. 1838. 



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

 hattan 1 8. 1894. 

 Radicula sinuata Greene, Leaflets i : 113. 1905. 



Perennial, diffuse, glabrous, the branches 

 ascending. Leaves oblong, lanceolate, or 

 oblanceolate, 2'-$' long, i'-i' 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, 

 \"-\\" 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. 



Radicula obtusa (Nutt.) Gr 

 Blunt-leaved Yellow-cress. 

 Fig. 2028. 



- 



Nasturtium obtusum Nutt. ; T. & G. Fl. N. A. 



74. 1838. 

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



1894. 

 Radicula obtusa Greene, Leaflets, i: 113. I95- 



Annual or biennial, diffuse, much-branche 

 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"- 

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

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

 ing; style $" long. 



In low grounds, Michigan to Missouri, Texas. 

 Montana and California. April-Aug. 



