126 CRUCIFERAE. (Vou. II. 
7. Roripa curvisiliqua (Hook.) Bessey. 
Curved-fruited Cress. (Fig. 1719.) 
Sisymbrium curvisiligqua Hook. Fl. Bor. Am. 1: 61. 
1830. 
Nasturtium curvisiliqua Nutt.; T. & G. Fl. N. A. 1: 
73. 1838. 
Roripa curvisiliqua Bessey, Mem. Torr, Club, 5: 169. 
1894. 
Annual or biennial, sparingly pubescent or gla- 
brous, stems erect or ascending, usually much 
branched, 6/-18’ high. Leaves oval or oblance- 
olate in outline, pinnatifid, pinnately lobed or 
toothed, the lower 1/-3/ long; flowers light yellow, 
2/’ broad in short racemes; petals rather longer 
than the sepals; style short; pods linear, 4/’-7/’ 
long, less than 1/’ wide, strongly curved upward; 
pedicels spreading or ascending, 1’’-2’ long. 
In moist soil, Nebraska (according to Bessey), to 
British Columbia and California. May-Aug. 
8. Roripa sessiliflora (Nutt. ) A. S. Hitch- 
cock. Sessile-flowered Cress. 
(Fig. 1720.) 
Nasturtium sessiliflorum Nutt.; T. & G. Fl. N. A. I: 
73. 1838. 
Roripa sessiliflora A. S. Hitchcock, Spring Fl. Man- 
hattan, 18. 1894. 
Annual or biennial, erect, glabrous, 8/-20’ high, 
sparingly branched above, the branches ascend- 
ing. Leaves petioled, the lower 3/—4’ long, obo- 
vate or oblong, obtuse, crenate, lobed or pinnati- 
fid, with obtuse lobes; flowers yellow, 1/’ broad, 
nearly sessile; pods very slightly pedicelled, 
spreading or ascending, 3//-6’’ long, 1/” broad, 
narrowly oblong; style very short; seeds minute, 
mostly in 2 rows in each cell. 
In low grounds, Tennessee, western Illinois and 
Towa to Kansas, south to Florida and Texas. April- 
June. 
g. Roripa Nasturtium (L.) Rusby. 
Water-cress. (Fig. 1721.) 
Sisymbrium Nasturtium 1. Sp. Pl. 657. 1753. 
Nasturtium officinale R. Br. in Ait. Hort. Kew. 
Ed. 2,4: 110. 1812. 
Roripa Nasturtium Rusby, Mem. Torr. Club, 
3: Part 3, 5. 1893. 
Aquatic, glabrous, branching, floating or 
creeping, rooting from the nodes. Leaves 
odd-pinnate, of 3-9 segments, the terminal 
one larger than the lateral, all obtuse, ovate 
or oval, or the terminal one nearly orbicular; 
racemes elongating in fruit; flowers white, 
2//-2'4’’ broad; petals twice the length of the 
calyx; pods 6’’-16” long, 1’’ wide, spreading 
and slightly curved upward, on pedicels of 
about their length; seeds distinctly in 2 rows. 
In brooks and streams, Nova Scotia to Mani- 
toba, south to Virginia and Missouri. Common 
in most districts. Naturalized from Europe. 
Native also of northern Asia and introduced into 
South America and western North America. 
Widely cultivated for salad. April-Nov. 
