Genus 21. 



MUSTARD FAMILY. 



2. Sophia pinnata (Walt.) Howell. 

 Mustard. Fig. 2052. 



Tansy- 



Erysimum pinnatum Walt. Fl. Car. 174. 1788. 

 Sisymbrium canescens Nutt. Gen. 2: 68. 1818. 

 Descurainia pinnata Britton, Mem. Torr. Club 5 : 173. 1894. 

 S. pinnata Howell, Fl. N. W. Am. 1 : 56. 1897. 

 Sophia brachycarpa (Richards.) Rydb. ; Britton, Man. 462. 

 1901. 



Densely canescent nearly all over, toglabrate; stem erect, 

 branched, 8'-24' tall, slender, the branches ascending. 

 Leaves 2'-^' long, oblong in outline, 2-pinnalifid into very 

 numerous small toothed or entire obtuse segments; pedicels 

 very slender, spreading nearly or quite at right angles to 

 the axis, $"-7" long, usually longer than the pods ; flowers 

 i"-ii" broad; pods horizontal or ascending, oblong or 

 linear-oblong, compressed, 3"-4" long, i" wide, glabrous 

 or somewhat canescent; style minute; seeds plainly in 2 

 rows in each cell. 



In dry soil, Pennsylvania to Florida, Iowa, North Dakota, 

 Colorado, California and Texas. May-July. 



3. Sophia incisa fEngelm.) Greene. Western 

 Tansy-Mustard. Fig. 2053. 



Sisymbrium incisum Engelm. ; A. Gray, Mem. Am. Acad. 



4 : 8. 1849. 

 Descurainia incisa Britton, Mem. Torr. Club 5 : 173. 1894. 

 Sophia incisa Greene, Pittonia 3: 95. 1896. 

 Sophia intermedia Rydb. Mem. N. Y. Bot. Gard. i : 184. 



1900. 



Resembles the preceding species, but is greener, 

 nearly glabrous, or the pubescence is mixed with 

 short glandular hairs. Leaves pinnately divided, and 

 the pinnae 1-2-pinnatifid into linear-oblong entire or 

 toothed segments ; fruiting pedicels widely ascending, 

 filiform, s"-io" long, usually longer than the pods; 

 pods 4'~7" long, about 1" thick, somewhat swollen, 

 erect or ascending; seeds in i row or indistinctly in 

 2 rows. 



In dry soil, Minnesota to Saskatchewan and British 

 Columbia, south to Tennessee, Kansas, Texas and Cali- 

 fornia. May-Aug. 



4. Sophia Hartwegiana (Fourn.) Greene. 

 Hartweg's Tansy-Mustard. Fig. 2054. 



Sisymbrium Hartwegianum Fourn. Sisymb. 66. 1865. 

 Sisymbrium incisum var. Hartivegianum Brew. & 



Wats. Bot. Cal. i: 41. 1876. 

 Descurainia Hartwegiana Britton, Mem. Torr. Club 



5: 173. 1894. . . 



Sophia Hartwegiana Greene, Pittonia 3: 95. 1896. 



Similar to the two preceding species, densely 

 minutely canescent or puberulent, stem i°-2° tall, 

 the branches slender, ascending. Leaves usually 

 less finely dissected, pinnately divided into S-7 

 pinnae, which are pinnatifid with obtuse segments 

 and lobes; fruiting pedicels erect-appressed or 

 closely ascending, lh"-4." long, shorter than or 

 equalling the pods; pods erect or nearly so, linear, 

 4"-S" long, about ¥' thick; seeds in I row. 



In dry soil, Minnesota to Saskatchewan, British 

 Columbia, Colorado, Utah, Mexico and California. 

 May-July. 



