Genus 21. 



MUSTARD FAMILY. 



[71 



2. Sophia pinnata (Walt.) Howell. Tansy- 

 ^Miistard. Fig. 2052. 



Erysimum pinnaiiim Walt. Fl. Car. 174. 1788. 

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

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

 5'. pinnata Howell, Fl. N. W. Am. i : 56. 1897. 

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

 1901. 



Densely canescent nearly all over, to glabrate ; stem erect, 

 branched, 8'-J4' tall, slender, the branches ascending. 

 Leaves 2'-4' long, oblong in outline, 2-pinnatifid into very 

 numerous small toothed or entire obtuse segments; pedicels 

 very slender, spreading nearly or quite at right angles to 

 the axis, 5"-7" long, usually longer than the pods ; flowers 

 l"-li" 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 (Engelm.) 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 mi.xed 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, 5"-io" long, usually longer than the pods; 

 pods 4"-/" long, about l" 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. Hartwegianum Brew. & 



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

 Descurainia Hartivegiana 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 5-7 

 pinnae, which are pinnatifid with obtuse segments 

 and lobes; fruiting pedicels erect-appressed or 

 closely ascending, ii"-4" long, shorter than or 

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

 4"-5" long, about V thick ; seeds in i row. 



In dry soil. Minnesota to Saskatchewan, British 

 Columbia, Colorado, Utah, Mexico and California. 

 May-July. 



