134 CRUCIFER.f:. 



divisions, the margined petiole auriculate-sagittate at the 

 base. Racemes loose, elongated, somewhat panicled, ebrac- 

 teate : the rather large and showy flowers violet-purple. 



Etymology. From itiSijr, viokl-colored , and Svdos, flower, in allusion to 

 the color of the petals. 



Geographical Distribution, &c. A genus of a single species, indi- 

 genous to the Western United States, removed, on account of its accumbent 

 cotyledons, from Hesperis, with which genus in all other respects it seems 

 substantially to accord. 



PLATE 54. Iodanthus hesperidoides, Tott. <Sr Gr. ; — a small speci- 

 men (from Ohio, Sullivant), the stem shortened. 



1. Diagram of the flower. 



2. A flower, enlarged. 



3. One of the lateral sepals ; and 4, a petal, enlarged. 



5. Stamens and pistil, enlarged. 



6. A silique, of the natural size. 



7. The upper end of a silique, enlarged ; seen edgewise. 



8. Lower part of the same, with a portion of the valves above cut away. 



9. Base of an enlarged pod, the valves removed, showing three seeds; the 



lower one cut in two, so as to display a section of the accumbent 

 cotyledons and radicle. 



10. Tissue of the partition, highly magnified. 



11. Embryo, detached entire ; enlarged. 



