Erysimum. CRUCIFER^E. 35 



long, erect; stigma eraarginate. Hook. — /?. Br. in liort. Kew. {ed. 2.) A. p. 

 116; DC. -prodr. I. p. 199; Hook. Ji. liar. -Am. I. p. 04. Chciranthus 

 erysimoides, Linn. 



Canada to Arctic America. — Distinguished ("rom the preceding by its 

 more pubescent leaves, shorter siliques, and larger Howers. Hook. 



3. E. a.'^perum (DC.) : canescent with a scabrous appressed pubescence, 

 the hairs (ixcd by the middle ; stem simple ; leaves linear-lanceolate, cauline 

 ones entire, radical ones runcinate-toothed ; siliques elongated, at length 

 spreading; style short, very thick; stigma 2-lobed. — DC! syst. 2. p. 506; 

 Hook. .ft. Bor.-Am. 1. p. 64. t. 22. E. lanceolatum, Phrsh, f. 2. p. 436. 

 (fide ' DC.) Cheiranthus asper, Nutt.! gen. 2. p. 69. 



Missouri ! to Oregon, and in British America, north to lat. 65°. (^ Stem 

 12-18 inches high. Cauline leaves 2 inches long, 2-3 lines wide ; margin 

 retrorsely scabrous. Flowers large, fragrant. Petals with the claws longer 

 than the sepals. Siliques 2-3 inches long, scarcely a line wide, somewhat 

 quadrangular. Seeds oblong. Cotyledons distinctly incumbent, although the 

 radicle is a little oblique. 



4. E. Arkansanum (Nutt.! mss.): "slightly roughened with appressed 

 hairs, which on the stem are fixed by the middle and on the leaves 3-parted ; 

 stem simple ; leaves oblong-lanceolate, runcinately and sinuately toothed, 

 attenuate at the base ; sihques elongated, nearly erect, tapering at the sum- 

 mit; stigma 2-lobed. 



" Open plains of Arkansas. [Also in Texas, Dr. Leavenworth .'] — (5) 

 Stem li-3 feet high, angular above. Leaves about 2 inches long, scarcely 

 one-third of an inch wide ; the radical ones almost pinnatifidly toothed, with 

 distant teeth. Raceme at first short and corymbose ; in fruit much elongat- 

 ed. Flowers as large as in the common Wall-flower, yellow, shaded with 

 orange. Claws of the petals much exserted ; Umb broadly obovate. Si- 

 hques 2^ inches long, ahnost exactly 4-sided." Nutt. — Cotyledons obliquely- 

 incumbent. Differs from the preceding in the less scabrous pubescence, 

 narrower and toothed leaves, and in the tapering summit of the style, as 

 well as in the larger flowers. 



5. E. elatum (Nutt.! mss.): "somewhat scabrous; the hairs on the stem 

 fixed by the middle, on the leaves 3-4-parted ; stem tall and simple ; radical 

 leaves usually runcinate ; cauline lanceolate, remotely denticulate, attenuated 

 at each extremity. 



" Grassy situations by the banks of the Wahlamet. — (5) Stem 3-5 feet 

 high, covered with minute appressed hairs, but not canescent. Radical 

 leaves more or less divided or toothed, sometimes, as likewise those of the 

 stem, almost entire. Flowers very large, colored with various shades of yel- 

 low and orange. Claws of the petals exserted, half an inch or more in 

 length; Umb obovate. Mature siliques not seen." Nutt. — Very near the 

 preceding. 



6. E. parviflorum (Nutt. mss.) : " canescent and scabrous ; stem low and 

 simple ; leaves all linear or somewhat lanceolate, almost wholly entire ; si- 

 liques erect; petals scarcely longer than the calyx. 



"Plains of the Rocky Mountains. — (z) or If About a foot high. Leaves 

 remarkably narrow, densely clustered at the base of the stem. Flowers 

 small, sulphur-yellow." Nutt. 



. 7. E. piimi7M7H. (Nutt. mss.) :" somewhat scabrous ; leaves linear, (appa- 

 rently) all entire ; siliques flatly 4-sided, very long, erect ; pedicels very short ; 

 stigma small, nearly entire ; petals longer than the calyx. 



" Dry elevated plains of the Rocky Mountains. — (1) Stems 2-4 inches 

 high. Flowers pale yellow, conspicuous. Siliques 3 inches or more in 

 length." Nutt. 



