56 



CRUCIFER^. [Cochlearia. 



«. fioribus luteis, petalis subintegris. 



fi, floribus fere albis, petalis emarglnatis. 



Hab. a. About Lac la Pluie, and Rocky Mountains, (not found in the low grounds.) Dmmmond, ^3. North- 

 West coast of America. Douglas. 



25. D. muralis; pubescens, caule ramoso folioso, foliis late ovatis caulinis cordatis sub- 

 amplexicaulibus profunde dentatis, siliculis elliptico-oblongis sub 16-sperniis pedicello 

 paulo brevioribus (floribus albis.)— Z/nn. Sp. PL p. 897. Engl Bot t 192. De Caiid. 

 Prodr, V. 1. p, 171. 



Hab. About Montreal. Mr. Cleahorn. — Petals white, entire or sometimes notched upon the same plant. 



Such is the best account I have been able to draw up of the individuals of this most difficult genus, 

 Draba. It is to me most unsatisfactory; and all I can offer in its favour is, that, in general, the species of 

 which it is composed have a peculiarity of aspect and growth, by which they are better distinguished than by 

 the characters here laid down. But there are, among the Europsean and Northern Asiatic species existing in 

 my Herbarium, many of which I am quite at a loss to determine whether or not they are different from the 

 North American ones. 



13. EROPHILA. DC. 



Sillcula ovalis aut oblonga, valvis planis, Semina plurima, im margin a ta. Ccd. sequalis. 

 Petala bipartlta. Stam, edentula. — Herbae annucB, scapis nudis, floribus alhis. DC. 



1. E. vulgaris ; siliculis elliptlcis pedicello brevioribus, scapis 5-15-floris. — De Cand. 

 Prodr. V, 1. p. 172. — Draba verna. Linn. Sp, PL p. 896. Engl, Bot t 586. Pursh, Fl. 

 Am. V. 2. JO. 433, 



Hab. Canada. Pursh. — I have not seen this in any collection from British America, and am unable to 

 say whether the plant alluded to by Pursh be the common Europsean state of E. vulgaris, or, as is more pro- 

 bable, the E. americana of D C, which only differs in its longer siliculae, according to specimens sent to me 

 from New York, by Dr. Torrey ; and which that gentleman has ascertained to be Draba hispidula of 

 Muhlenberg. 



14. COCHLEARIA. Toum. 



Silicula sessilis, ovato-globosa aut oblonga, valvis ventricosis, Semina plurima, imraar- 

 ginata. CaL aequalis, patens. Pet Integra. Stam. edentula. — Flores aibi. Folia scepius 

 carnosa. DC. 



I 



1. C ohlongifolia; siliculis subrotundis pedicello dimidio brevioribus, foliis caulinis 

 oblongis integris (vel siQuato-dentatis) sessilibus, summis brevissime auriculatis. — De Cand. 

 Prodr. V, 1. p. 363. Cham, et Schlecht in Linnceay v. 1. p, 26. 



" Valde similis CochlearicB officinali ! Differe videtur : foliis caulinis basi magis angus- 

 tatis, amplexicaulibus quidem, auriculis vero minus productis; floribus minoribus, siliculis 

 stylo breviori apiculatis. An species ? Ut congeneres variat habitu et statura." — Cham, 

 et Schlecht 



t 



Hab. Islands of St. Lawrence and Unalaschka. Chamisso. Kotzebue*s Sound. Lay and Collie in 

 CapL Beechey^s Collection. — I possess authentic specimens of this from Dr. Fischer, which confirm the 

 observations above given. 



