22.
Rorippa teres
(Michaux) Stuckey, Sida. 2: 409. 1966.
Cardamine teres
Michaux, Fl. Bor.-Amer. 2: 29. 1803;
Erysimum walteri
(Elliott) Eaton;
Nasturtium micropetalum
Fischer & C. A. Meyer;
N. obtusum
Nuttall;
N. palustre
(Linnaeus) de Candolle var.
tanacetifolium
de Candolle;
N. tanacetifolium
(de Candolle) Hooker & Arnott;
N. walteri
(Elliott) Alph. Wood;
Rorippa obtusa
(Nuttall) Britton;
R. teres
var.
rollinsii
Stuckey;
R. walteri
(Elliott) C. Mohr;
Sisymbrium teres
(Michaux) Torrey & A. Gray;
S. walteri
Elliott
Annuals or, rarely, biennials;
puberulent, at least proximally, or glabrous, (some trichomes clavate to hemispherical, vesicular).
Stems
(simple or several from base), usually prostrate or decumbent, rarely erect, branched distally, 1-4 dm, (glabrous or pubescent, trichomes vesicular).
Basal leaves
rosulate; blade margins pinnatifid.
Cauline leaves
shortly petiolate; blade oblong, oblanceolate to obovate, or lyrate-pinnatisect, (lateral lobes oblong to ovate), (2-)3.5-10(-13.5) cm × 10-40(-53) mm, base auriculate or not, margins usually pinnatifid to pinnatisect, rarely 2-pinnatifid, (lateral lobes) dentate to crenate or sinuate, (surfaces glabrous or adaxially pubescent, trichomes vesicular).
Racemes
elongated.
Fruiting pedicels
ascending to horizontal, straight or curved-ascending, (1.5-)2.3-4.7(-5.3) mm.
Flowers:
sepals erect, oblong, 1.5-2.5 × 0.5-1 mm; petals yellow, spatulate, 1-2 × 0.4-0.7 mm; median filaments 1.2-1.7 mm; anthers ovate, 0.2-0.3 mm.
Fruits
siliques, straight or curved, linear to oblong-linear, 8-14(-21) × 1-2.5 mm; valves glabrous or pubescent; ovules (100-)150-210 per ovary; style (0.2-)0.5-1.1 mm.
Seeds
biseriate, reddish brown, cordiform, 0.4-0.5 mm, foveolate.
Flowering Dec-May. Wet areas, muddy grounds, edges of canals and ditches, sandy fields, margins of ponds, streamsides, peat; 0-600 m; Ala., Ark., Fla., Ga., La., Miss., N.C., Okla., S.C., Tex.; Mexico; Central America (Honduras, Nicaragua).
