MUSTARD FAMILY 10"J 



nearly glabrous. Petals about % in. long. Pods beaded, on 

 short erect pedicels, appressed, l / 2 to Y± in. long, with conical 

 seedless beak; seeds dark, very peppery. — Introduced weed in 

 low places. 



2. B. arvensis B. S. P. Charlock. Stems erect, 1 to 3 or 

 even 6 ft. high, rough. Petals % to y 2 in. long. Pods knotty, 

 nearly erect along the stems, 1 to V/ 2 in. long, with a stout 

 2-edged beak which often contains a seed. — An introduced 

 weed along our lower borders, especially near dwellings. 



3. B. campestris L. Rutabaga. Plant glabrous except the 

 lower leaves, J / 2 to 4 ft. high. Leaves clasping the stem. 

 Petals }i in. long. Pods smooth, \% to \ l / 2 in. long, narrowed 

 to a slender cylindric beak. — A garden plant run wild; grows 

 at Tuolumne Meadows. 



9. SISYMBRIUM. 



Erect annuals with deeply cut or finely lobed leaves not 

 clasping at base and small yellow flowers. Pods linear, short, 

 scarcely flattened. 



1. S. canescens Nutt. Tansy Mustard. A leafy annual, a 

 few inches to 2 ft. high, from a 

 taproot, grayish with a close pu- 

 bescence. Leaves always finely 

 many-lobed. Pedicels % to V* in- 

 long, spreading. Pods slightly 

 longer, erect or nearly so; seeds 

 in two rows in each cell. 



The gray herbage and finely 

 cut leaves of the Tansy Mustard 

 are commonly seen around de- 

 serted camps and in other waste 

 places of our district. It is 

 widely distributed in North 

 America. The seeds were for- (U xl 



merly used by the Indians, who added them to coarse flour, or 

 "pinole," to give it a more piquant taste. 



2. S. incisum Engelm. Much like no. 1, but often nearly 

 glabrous and the leaves less finely lobed. Seeds as wide as 

 the pod and therefore in one row in each cell. — Widely dis- 

 tributed. 



10. ERYSIMUM. Wall Flower. 

 1. E. asperum DC. Western Wall Flower. Leaves rough- 

 pubescent, \y 2 to 5 in. long, % to y> in. wide, entire to sharply 



