CRUCIFERAE 179 



somewhat lobed or subentire; upper cauline more deeply lobed or toothed, 

 sessile and auriculate at base; pods globose, smooth or faintly reticulated. 

 Along the seacoast, Alaska to Oregon. Cape Elizabeth and Port Gran- 

 ville, Washington, A. S. Foster; Oregon, Howell; Vancouver Island, British 

 Columbia, Macoun. 



235. RADICULA. 



Aquatic or marsh herbs ; leaves usually lyrately or pinnately 

 parted or toothed, auricled at base; flowers small, yellow or white; 

 style short or slender; pods terete or nearly so; seeds turgid, 

 minute, in two rows in each cell. 



Flowers white; leaves pinnately divided. R. nasturtium-aquatica. 



Flowers yellow; leaves variously margined, mostly 



pinnate. 

 Pedicels short, 2-4 mm. long; stems diffuse. 



Pods curved; leaf-lobes acute. R. curvisiliqua. 



Pods straight; leaf-lobes obtuse. R. obtusa. 



Pedicels longer, 6-8 mm. long; stems erect. 



Pods 4-8 mm. long. R. palustris. 



Pods 8-12 mm. long. R. pacified. 



Radicula nasturtium-aquatica (L.) Britten & Rendle. Perennial, aquatic, 

 smooth; stems procumbent, rooting at the lower nodes, 10-30 cm. high; leaves 

 pinnate; leaflets 311, orbicular or oblong, sinuate, or the lower ones some- 

 times reduced to the terminal leaflet; petals white, 3-4 mm. long; pods linear, 

 12-20 mm. long, acute at each end, a little longer than the spreading pedicels. 



Cultivated under the name of Water Cress, and often escaping. 



Radicula curvisiliqua (Hook.) Greene. Annual or biennial, glabrous or 

 slightly pubescent, erect or decumbent, 15-40 cm. high; leaves oblanceolate, 

 sinuate-dentate or pinnately cleft into oblong dentate lobes; flowers small, 

 pale yellow; petals 2 mm. long, exceeding the sepals; pods linear-oblong, 4-16 

 mm. long; style stout or none. 



In dried-up ponds and swales, common and variable. 



Radicula obtusa (Nutt.) Greene. Annual or biennial, glabrous or nearly 

 so, branching from the base, spreading; leaves pinnately parted or divided, or 

 the upper often subentire and oblong; pedicels 2-4 mm. long, ascending or 

 spreading; flowers yellow; pods usually long, straight; style very short and 

 thick. 



Reported from Vancouver Island, British Columbia, Macoun. 



Radicula palustris (L.) Moench. Annual or biennial, glabrous or nearly 

 so, erect, 30-90 cm. high; leaves lanceolate, pinnately cleft or parted, petioled, 

 5-15 cm. long, the segments toothed; pods 4-8 mm. long, short-cylindric or 

 ovoid, mostly shorter than the pedicels. 



Wet places, sometimes in shallow water. 



Radicula pacifica (Howell) Greene. Very similar to R. palustris; pods 

 larger, 8-12 mm. long, as long as the pedicels. 



In wet places. Probably only a subspecies of R. palustris. 



236. LEPIDIUM. PEPPERGRASS. 



Erect or diffuse annual or biennial herbs; leaves pinnatifid, 

 toothed or entire; flowers small, white or greenish, in racemes; 



