267 



Nasturtium hispidnm (Desv.) DC. Syst. ii. 20i (1821). 



Brae hylobus hispidiis, Dqsv. ]onrn. Bot. iii. 183 (18 14). 

 Nastiirthnn palustrc, var. Jiispidiim, A. Gray, Man. Ed. 5 

 (1867.) 



I am satisfied that this is a distinct species from the European 

 N. palustrc, and in this conclusion I am strengthened by the 

 opinions of such close observers as Mr. Bicknell and Professor 

 Macoun. The plant is apparently strictly East American in 

 distribution, and is one of the commonest Crucifers in our territory. 

 N. palustrc is rarely met with and occurs only in situations where 

 it has been introduced. It can readily be distinguished from N. 

 hispidnm by its linear pods which are 4-6 times as long as thick, 

 and by the nearly entire absence of pubescence on the stem and 

 branches, N. hispiduui having globose-ovoid pods, and usually 

 considerable hirsute pubescence. 



The status of the Northwestern and Rocky Mountain plant 

 which has also been referred to ^V. palustrc is more uncertain. 

 It is commonly larger than European palustrc, has, I believe, 

 larger flowers and still longer pods. Professor Macoun is inclined 

 to consider it a distinct species, but the specimens at my com- 

 mand do not convince me of the correctness of this view. It is 

 certainly closer to palustrc than hispidum is, and shares the pecu- 

 larity of many Rocky Mountain species in more nearly resembling 

 European plants than do those of the eastern half of the conti- 

 nent. 



Arabis lyrata, L. Sp. PI. 685 (1753). 



Cardaminc spathulata, Michx. Fl. Bor. Am. ii. 29 (1803). 



Under these circumstances it will no longer seem strange that 

 Michaux's species which came from the Southern Alleghenies, 

 and of which the type is preserved at Paris, has never since been 

 found. 



CORONOPUS, Hall. Helv. i. 217 (1768), fide Baillon, Hist. 

 PI. iii. 286: Gaertn. Fruct. et Sem. ii. 293, t. 242 (1791). 



Sencbiera, D.C. Mem. Soc. Hist. Nat. Paris, vii. 140, t. 89 

 (1799). 



The earliest specific names of the two species occurring in 

 North America may be indicated as follows : 



I. Corojiopus didynius, (L.), Smith, Fl. Brit. iii. 691 (1800). 



