leaves of his plant are perfectly entire ; that the stem leaves are 

 dilated at the base and amplexicaul ; that the peduncles are elongated 

 as well as the compound filiform pedicels ; that the bracteaB are 

 ovate ; that the corolla is yellow at the apices of its lobes ; that the 

 upper surface of the lower lip has long yellowish hairs; and, finally, 

 that the barren filament dips to the lower side of the corolla, and is 

 covered with yellowish hairs. But Dr. Hooker's figure is totally at 

 variance with all this in every particular : his radical leaves are 

 strongly serrated, and. although this is occasionally slightly the case 

 with Dr. Graham's plant, yet it is not a usual character ; the stem leaves 

 are neither dilated at the base nor amplexicaul; the peduncles are 

 not elongated, but are, on the contrary, particularly short ; there is 

 no yellow at the apices of the lobes of the corolla ; and, finally, there 

 is no appearance of yellow hairs upon either the lower lip of the 

 corolla, or upon the barren filament. But Dr. Hooker adds, that his 

 plant agrees with specimens collected by Mr. Douglas about Red 

 River, which are also identical with Mandan specimens named by 

 Nuttall himself. Having, fortunately, the advantage of referring to 

 Mr. Douglas's Red River specimens in the possession of the Horti- 

 cultural Society, we find them indeed agreeing most exactly with the 

 figure of the Glasgow plant, but not at all with those in our own 

 Herbarium of Dr. Richardson's plant. 



The explanation of all this is clearly, that the figure in the 

 Botanical Magazine is of P. gracile,' — of which it is, by the way, an 

 excellent representation, — while the description is of P. glaucum ; 

 and that these two species are not the same, as Dr. Hooker has 

 concluded. 



J. L. 



