84 Flora of the Palouse Region 



131. BARB ARE A. 



Chiefly biennials, somewhat succulent: stems angled: leaves en- 

 tire or pinnatifid: flowers yellow, in racemes: pod linear, terete, or 

 somewhat 4-angled, tipped with the short slender style; seeds flat, 

 in one row. 



B. vulgaris R. Br. Perennial, glabrous: stems simple or branched above, 

 30-90 cm. high: lower leaves pinnately cleft or parted, large, orbicular or 

 ovate, entire or nearly so; lateral segments 1-5 pairs, smaller, oblong, en- 

 tire or toothed; petioles short, auricled at base; upper cauline leaves obovate, 

 clasping, the lower part pinnately-cleft: raceme dense: petals yellow, 4 mm. 

 long, twice as long as the sepals: pods erector ascending, 2-3 cm. long, 

 beaked by the slender style; petals short and stout. Wet places, not com- 

 mon . 



132. PLATYSPERMUM. 



Low annual herb: leaves lyrate, few-lobed or subentire: 

 flowers minute, solitary, on naked scapes: pods compressed par- 

 allel to the partition, short, suborbicular; seeds broadly winged, 

 in two rows. 



P, SCapigerum Hook. Glabrous: scapes 5-15 cm. tall, erect orascending: 

 leaves spatulate-oblong, nearly entire, mostly coarsely 3-7-lobed, all petioled: 

 pod orbicular-ovate, 5-10 mm. long, beaked with the short style. In moist 

 gravelly places in early spring. 



133. NASTURTIUM. 



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, min- 

 ute, in two rows in each cell. 



Flowers yellow. 



Perennial by creeping rootstocks. N. SINUATUM. 



Annual. N. ctrvisiliqua. 



Flowers white. X. officinale. 



N. sinuatum Xutt. Stems prostrate or decumbent, branched, glabrous or_ 

 slightly scurfy-pubescent, from perennial creeping rootstocks: leaves lan_ 

 ceolate or oblong, 2-3 cm. long, pinnatifid into numerous equal linear or ob 

 long lobes, these entire or nearly so: flowers 3-4 mm. long: pods oblong, 

 6-8 mm. long, acute at each end, tipped with the longstyle: pedicels spread- 

 ing, 5-8 mm. long. Sandy banks of Snake River at Almota. 



N. CUrvisiliqua Xutt. Annual or biennial, glabrous or slightly pubes- 

 cent, erect or decumbent, 15-40 cm. high: leaves oblanceolate, sinuate-den- 

 tate 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; 

 styles stout or none. Wet places, common. 



N. officinale R- Br. Perennial, aquatic, smooth: stems procumbent, root- 

 ing at the lower joints, 13-30 cm. high: leaves pinnate; leaflets 3-1 1, orbicu- 



