Vou. II.] MUSTARD FAMILY. 125 
4. Roripa sphaerocarpa (A. Gray) 
Britton. Round-fruited Cress. 
(Fig. 1716.) 
Nasturtium sphaerocarpum A, Gray, Mem. Am. 
Acad. 4:6. 1849. 
Roripa sphaerocarpa Britton, Mem. Torr. Club, 5: 
170. 1894. 
Glabrous, stem erect or decumbent, usually 
branched, slender, 4’-12’ high. Leaves oblong, 
obtuse, the lower lyrate-pinnatifid or incised, 
the upper sometimes nearly entire, all petioled 
or the upper subsessile; petioles narrowly mar- 
gined, somewhat clasping at the base; flowers 1/’ s< 
broad or less; petals yellow, about equalling the 
sepals; silicle globose, about 1// in diameter, v iN \ cE: 
about as long as its pedicel; style very short. vf 
Illinois to Kansas, Texas and California. June- 2 \\ 
July. Ry Z Ty 
5. Roripa palustris (1,.) Bess. Marsh or Yellow Water-cress. (Fig. 1717.) 
Sisymbrium amphibium var, palustre L,. Sp. 
PI G572) 0753: 
Nasturtium terrestre R. Br. in Ait. Hort. 
Kew. Ed. 2, 4: 110. 1812. 
Nasturtium palustre DC. Syst. 2: 191. 1521. 
Roripa palustris Bess. Enum. 27. 1821. 
Annual, or biennial, erect, branching, 
glabrous or slightly pubescent, 1°-3%° 
high. Lower leaves petioled, 3/-7’ long, 
oblong or oblanceolate, deeply pinnatifid 
(rarely only dentate), the lobes acutish 
or blunt, repand or toothed; upper leaves 
nearly sessile, dentate or somewhat lobed; 
base of the petiole often dilated and clasp- 
ing; pedicels slender, 3/’ long in fruit; 
flowers yellow, 2’’-3/’ broad; pods linear, 
or linear-oblong, 2-6 times as long as 
thick, about equalling the pedicels, spread- 
ing or curyed; style %4’’ long or less. 
In wet places, nearly throughout North 
America except the extreme north. Appar- 
ently naturalized from Europe on the eastern 
side of the continent, but evidently indige- 
nous in the west. May-Aug. 
6. Roripa hispida (Desy.) Britton. His- 
pid Yellow-cress. (Fig. 1718.) 
Brachylobus hispidus Desy. Journ. Bot. 3: 183. 1814. 
Nasturtium hispidum DC. Syst. 2: 201. 1821. 
Nasturtium palustre var. hispidum A. Gray, Man. Ed. 
2, 30. 1856. 
Roripa hispida Britton, Mem. Torr. Club, 5: 169. 1894. 
Roripa palustris hispida Rydberg, Contr. U. S. Nat. 
Herb. 3: 149. 1895. 
Resembling the preceding species, but often 
stouter, sometimes 4° high, the stem, branches, 
petioles and veins of the lower surfaces of the 
leaves hirsute with spreading hairs. Leaves lyrate- 
pinnatifid; pedicels slender, spreading, about 3/’ 
long, longer than the globose or ovoid pod, which 
is 1-2 times as long as thick. 
In wet places, New Brunswick to British Columbia: 
Florida and New Mexico. Lower leaves sometimes 
10’ long. Summer. 
