216 



CRUCIFERJE. 



and delicate; segments small, elliptical or in the upper leaves 

 linear-oblong; petals about 1 line long, equaling or exceeding the 

 sepals; capsule oblong to linear, acute at each end and beaked 

 with a very short style, 3 to 6 lines long, borne on slender spreading 

 pedicels of equal or greater length. — (S. canescens Nutt.) 



Livermore (acc. to Greene), the upper San Joaquin Valley, and 

 southward to Southern California. Apr. 



4. CAKILE L. 



Maritime branching annual with fleshy leaves and rather small 

 purplish or white flowers. Pod fleshy, or when ripe, dry and 

 corky, 1-celled, jointed in the middle, the 2 joints 1-seeded, the 

 upper joint at length deciduous, the lower one persistent. Cotyledons 

 accumbent. (Arabic name.) 



1. C. Americana Nutt. Sea Kocket. Stems decumbent, often 

 2 ft. long; leaves oblanceolate or narrowly obovate, crenate or 

 shallowly sinuate-toothed; pod 1 in. long or less, the lower segment 

 cylindrical, the upper ovoid and acuminately narrowed to a flattened 

 truncate often retuse beak. 



Seashore about San Francisco and beaches of San Francisco Bay 

 at \Yest Berkeley. 



5. BRASSiCA L. Mustard. 

 Annuals, either glabrous or sparsely hispid with coarse hairs, the 

 lower leaves usually lyrately pinnatifid or pinnate, the upper disposed 

 to be more or less entire. Flowers large, yellow. Lateral sepals 

 more or less gibbous at base. Petals with long claw and abruptly 

 spreading limb. Papilla-like glands 4, green, alternating with the 

 claws of the petals. Pod terete, terminating in a stout beak; valves 

 1 to several-nerved. Seeds in 1 row. globose. Cotyledons con- 

 duplicate, incumbent. (The Latin name for Cabbage.) 



Pods terete, commonly 1 in. long or more, on ascending or spreading 

 pedicels. 



Beak terete; stem-leaves auriculate-clasping 1. B. campestris. 



Beak 2-edged, often 1-seeded, much shorter than the body; stem-leaves 

 petioled, or the upper merely sessile, none auriculate-clasping .... 



2. B. arvensis. 



Beak very much flattened, longer than the white-hispid body; leaves all 



petioled 4. B. alba. 



Pods somewhat quadrangular, closely appressed to the axis of the raceme, 

 % to y A in. long; leaves all petioled 3. B. nigra. 



1. B. campestris L. "Common Yellow Mustard." Succu- 

 lent, glaucous and glabrous save for bristle-bearing pustules on the 

 upper surface of the lower leaves, erect, sparingly branched, 1 to 6 ft. 

 high; cauline leaves all sessile and clasping by an auricled base; 

 upper cauline lanceolate and entire; lower cauline irregularly serrate 

 or denticulate, and pinnatifid or pinnate with the terminal segment 

 very large and lateral segments sessile by a broad base and more or 

 less decurrent on the rachis; radical leaves similar to the lower 

 cauline, petioled; flowers 6 to 8 lines broad; sepals narrowly oblong, 



