[72 



CRUCIl'iaiAE. 



Vol. II. 



25. CHEIRINIA Link, Enum. llort. Berol. 2: 170. 1820. 



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

 or hoary, with 2-branched hairs, the leaves simple, entire, toothed or lobed. Mowers yellow. 

 Siliques elongated, linear, 4-angled or rarely terete; valves strongly keeled by a prominent 

 niidvein. Stigma lobed. Seeds oblong, in i row in each cell, marginless or narrowly mar- 

 gined at the top ; cotyledons incumbent. [Greek name from similarity of this genus to 

 Cbeiri Adans.J 



A genus of about 90 species, natives of the north temperate zone, most abundant in eastern 



Europe and central Asia. In addition to the following, several others are found in the Rocl<y 



Mountains and on the California coast. Type species: Chcirinia cheiranthoides (L.) Link. 

 Flowers 2"-4" high. 



Pedicels slender, spreading; pods very narrow, 6"-i2" long. i. C. cheiranthoides. 

 Pedicels stout, short. 



Perennial ; native ; pods ascending. 2. C. inconspicua. 



Annual ; introduced ; pods spreading. 3. C. rcfanda. 



Flowers 8"-i2" high, conspicuous. 4. C.aspera. 



I. Cheirinia cheiranthoides (L.) Link. Worm- 

 seed or Treacle Mustard. Fig. 2055. 



Erysimum cheiranthoides L. Sp. PI. 66r. 1753. 



Cheirinia cheiranthoides Link, Enum. Hort. Berol. 2: 170. 

 1820. 



Cheiranthiis cheiranthoides Heller, Cat. N. A. PI. 4. 1898. 



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

 high. Leaves lanceolate or oblong-lanceolate, 1-4' 

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

 ing at the base into a short petiole or the upper sessile; 

 pedicels slender, spreading or somewhat ascending, 

 3"-4" long in fruit; flowers about 2J" high; pods 

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

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

 cels ; valves strongly keeled ; styles i" long. 



Along streams and in fields, Newfoundland to New Jersey, 

 Pennsylvania, Tennessee and Missouri, west to the Pacific 

 Coast. Appears in some places as adventive. Also in 

 northern Europe. Tarrify. June- Aug. 



3. Cheirinia inconspicua (S. Wats.) 

 Britton. Small-flowered Prairie- 

 rocket. Fig. 2056. 



Erysimum parviflorum Nutt. ; T. & G. Fl. N. A. 



I : 95. 1838. Not Pers. 

 Erysimum asperum var. inconspicuum S. Wats. 



Bot. King's Exp. 24. 1871. 

 E. inconspicuum MacM. Met. Minn. 268. 1892. 

 Erysimum syrticolum Sheldon, Bull. Torr. Club 



20: 285. 1893. 



, Perennial, roughish-puberulent or canescent, 

 stem erect, i-2 tall, simple or sparingly 

 branched. Leaves oblanceolate or linear, l'-3' 

 long, obtuse, entire or dentate, the upper ses- 

 sile, the lower slender-petioled ; flowers about 

 4" high and broad; pedicels stout, about 2" 

 long in fruit, ascending; pod narrowly linear, 

 f'-2i' long, about i" wide, minutely rough- 

 puberulent, narrowly ascending or erect; style 

 very stout, i"-i" long. 



In dry soil. Ontario to Manitoba. British Colum- 

 bia and Alaska, south to Kansas, Colorado and 

 Nevada. Adventive farther east. July-.\ug. 



