MUSTARD FAMILY. 187 



]>lt\ 1 -_. in. long; sepals often colored, broad, 2 to 3 lines long; pods erect or 

 ascending, nearly straight, % to l in. long, l line wide, abruptly beaked by a 

 short stout style; valves veined, L-nerved; seeds in l row, round-elliptical, nar- 

 rowly winged or scarcely margined. 



Rocky hilltops near the sea from San Francisco to Monterey. Mar. -Apr. 



5. A. breweri Wats. Brewer Bock Cress. Stems many from the much 

 branched crown of a stout woody root, 2 to 6 in. high ; herbage stellately 

 pubescent or canescent, especially below; lower leaves broadly spatulate, entire, 

 3 to 9 lines long; upper leaves lanceolate to oblong, sessile by a subcordate 

 base or obtusely auriculate; flowers bright red-purple or nearly white, 2 to 3 

 lines long, the pedicels and purplish calyx more or less villous; pods spreading 

 and arcuate, iy 2 to 2!/2 in. long, 1 line broad; valves l-nerved, veined; seeds 

 orbicular, narrowly winged, somewhat in 2 rows. 



Rocky summits of mountain peaks from borders of Lake Co. southward to 

 Mt. Diablo, Mt. Hamilton and Loma Prieta. Apr. 



9. BARBAREA R, Br. 



Perennial herbs similar to the yellow-flowered Nasturtiums. Stem angular. 

 Leaves lyrate or pinnatifid. Stamens 6, distinctly tetradynamous. Pod 

 linear, somewhat quadrangular, abruptly terminated by a pointed style, the 

 valves strongly l-nerved or carinate. Seeds in 1 row in each cell, turgid, not 

 margined. (Named after St. Barbara.) 



1. B. vulgaris R. Br. Winter-cress. Glabrous, rather stout, 10 to 16 in. 

 high; radical leaves elliptic, sometimes cordate at base, % to 2 in. long, with or 

 without small supplementary lobes borne along the petiole; cauline similar, 

 pinnatifid, with the terminal lobe largest and often oblong-lanceolate; raceme 

 terminal and solitary or with several from the upper axils ; petals narrowly 

 obovate or oblanceolate, the blade scarcely narrowed into a claw, about 3 lines 

 long, twice as long as the yellow sepals; pod 1% in. long. 



Along mountain or hill streams: Coast Ranges and Sierra Nevada. June- 

 .lulv. 



10. NASTURTIUM L. 



Nearly or quite glabrous annuals or perennials, sometimes growing in water, 

 mostly in wet places. Leaves toothed or pinnatifid or pinnately divided. 

 Flowers small, white or yellow. Sepals spreading in anthesis. Petals scarcely 

 clawed. Stigma capitate, nearly sessile. Pod linear or oblong, terete or 

 nearly so, valves mostly l-nerved. Seeds minute, in 2 rows in each cell; cotyle- 

 dons aecumbent. (Latin, nasus, nose, and tortus, twisting, the nostrils affected 

 by the pungent herbage.) 



Flowers white; petals distinctly clawed, nearly twice the length of the sepals 



1. N. officinale. 



Flowers yellow; petals scarcely clawed, little longer than the sepals. 



Pods linear, curved upward 2. N. curvisiliqua. 



Pods oblong, turgid, straight 3. N. palustris. 



1. N. officinale R. Br. Watercress. Stems ascending or prostrate at base 

 and rooting at the nodes, the herbage glabrous; leaflets or segments 3 to 9, 

 ovate or nearly round, the terminal always the largest, or the lowest leaves 

 without lateral leaflets; flowers white, 2 to 2% lines broad; petals nearly twice 

 the length of the sepals; pods divaricately spreading, y.> to 1 in. long, the 

 pedicels about as long. 



Abundant in slow-flowing creeks (especially where not bordered by trees) 

 and about springs in the mountains. Naturalized from Europe. 



