166 Plants collected during a journey 



Obs. The genus Meconopsis was established prior to- the 

 Stylophorum of Nuttall, so that the former must be adopted. 

 Besides, there is a genus Stylephorus in zoology, which is too 

 near the latter in sound and derivation. 



15. Argemone mexicana, (3. albijiora, DC. prod. i. p. 

 120. Along the Platte and Canadian rivers ; abundant. 



Desc. Plant erect, robust, about 3 feet high, exuding a yellowish bit- 

 ter juice when wounded ; the stem and leaves armed with rigid reflexed 

 prickles. Leaves sinuately pinnatifid, whitish along the veins beneath. 

 Flowers twice as large as in A. mexicana. 



Obs. This is supposed to be a distinct species by some bo- 

 tanists. It does not, however, appear to differ specifically 

 from A. mexicana. 



16. Sanguinaria canadensis, L. DC. syst. ii. p. 89. 

 About the lead mines of Missouri. 



CRUCIFER^:. 



17. Iberis, n. sp. 9 caule herbaceo ; pedicellis fructiferis 

 racemosis ; siliculis planis, biscutatis, utrinque emarginatis ; 

 lobulis rotundatis. 



Obs. The specimens of this plant are without leaves, so 

 that the species cannot be determined with certainty. The 

 stem, peduncles, and calyx, are covered with a dense white 

 ramified pubescence. 



18. Sisymbrium canescens, Nutt. gen. ii. p. 68. DC. 

 prod. i. p. 194. 



19. Vesicaria ludoviciana, DC. 1. e. p. 159. AJys- 

 sum ludovicianum, Nutt. gen. ii. p. 63. 



20. Erysimum asperum, DC. prod. i. p. 199. Cheir- 

 anthus asper, Nutt. gen. ii. p. 69. On the Platte. 



Obs. Plant very bitter, particularly the root. It is used 

 as a medicine by the Indians. 



21. Stanleya integrifolia, James inLong's ex. ii. p. 17» 

 Sandstone ridges, at the base of Rocky Mountains. 



