VOL. II.] 



MUSTARD FAMILY. 



i. E. cheiranthoides. 



33. ERYSIMUM L. Sp. PI. 660. 1753. 



Annual or biennial, mainly erect and branching herbs, more or less pubescent or hoary, 

 with simple entire toothed or lobed leaves. Flowers mostly yellow. Siliques elongated, 

 linear, 4-angled or rarely terete; valves strongly keeled by a prominent midvein. Stigma 

 lobed. Seeds oblong, in i row in each cell, marginless or narrowly margined at the top; 

 cotyledons incumbent. [Greek, name of a garden plant, meaning, perhaps, blister-drawing.] 



A genus of about 85 species, natives of the north temperate zone, most abundant in eastern 

 Europe and central Asia. In addition to the following, 2 others are found in the Rocky Mountains 

 .and one on the Californian coast. 



Flowers 2" -4" high. 



Pedicels slender, spreading; pods very narrow, 6"-ia" long. 

 Pedicels stout, short; pods 9' -2' long. 



Pods i'-2' long, less than i" thick; plant green, appressed-pubescent. 2. E. inconspicuum. 

 Pods9"-i8" long, about i" thick; plant pale, appressed-canescent. 3. E. syrticolum. 

 Flowers 8" -12" high, conspicuous. 4. E. asperum. 



I. Erysimum cheiranthoides L,. Worm- 

 seed or Treacle Mustard. (Fig. 1783.) 



Erysimum cheiranthoides L. Sp. PI. 661. 1753- 



Erect, minutely rough-pubescent, branching, 8'-2 

 high. Leaves lanceolate or oblong-lanceolate, i'-4' 

 long, acutish or obtuse, entire or slightly dentate, ta- 

 pering at the base into a short petiole or the upper ses- 

 sile; pedicels slender, spreading or somewhat ascend- 

 ing, 3 // -4 // long in fruit; flowers about a^" high; pods 

 linear, obtusely 4-angled, glabrous, 6 // -i2 // long, less 

 than i" broad, nearly erect on slender spreading pedi- 

 cels; valves strongly keeled; style YT." long. 



Along streams and in fields, New Jersey, Pennsylvania 

 and southern New England to Newfoundland, west to the 

 Pacific Coast. Appears in some places as adventive. 

 Also in northern Europe. June-Aug. 



2. Erysimum inconspicuum (S. Wats.) MacM. 



(Fig. 1784.) 



Small Erysimum. 



Erysimum parvtflorum Nutt. ; T. & G. Fl. N. 

 A. i: 95. 1838. Not Pers. 



Erysimum asperum var. inconspicuum S. Wats. 

 Bot. King's Exp. 24. 1871. 



Erysimum inconspicuum MacM. Met. Minn. 

 268. 1892. 



Erect, green, roughish-puberulent, stem 

 i-2 tall, simple or sparingly branched. 

 Leaves oblanceolate or linear, i / -3 / long, 

 obtuse, entire or dentate, the upper sessile, 

 the lower slender-petioled; flowers about 4" 

 high and broad; pedicels stout, about 2" long 

 in fruit, ascending; pods narrowly linear, i'- 

 2' long, less than \" wide, minutely rough- 

 puberulent, narrowly ascending or erect; 

 style very stout, X // ~ I 



In dry soil, Minnesota to Manitoba, British 

 Columbia and Alaska, south to Kansas, Colo- 

 rado and Nevada. Also in Ontario, according to 

 Macoun. July-Aug. 



