482 Rydberg: Studies on the Rocky Mountain flora 



Monarda Nuttallii A. Nels. or M . citriodora of Coulter's Manual 

 is Monarda pectinata Nutt. 



Salvia Columbariae Benth. has been collected in Utah. 



SCROPHULARIACEAE 



Miss Eastwood has called to my attention that Pentstemon 

 acuminatus, P. humilis Nutt., and P. glaucus Graham have been 

 misinterpreted. P. acuminatus is a species confined to the 

 Columbia Valley, has a more ample corolla, perfectly glabrous 

 within; the tongue of the sterile filament is strongly curved and 

 only short-bearded at the apex. Whether the so-called P. 

 acuminatus of the Rocky Mountain region is a distinct species 

 or should be included in P. nitidus Dougl. is hard to tell. A 

 duplicate of the type of the latter is in the Columbia University 

 herbarium, but this, as well as several other specimens, does not 

 have the broad, abruptly acuminate bracts, characteristic of the 

 so-called P. acuminatus, but there is no other distinction and inter- 

 mediate forms are not lacking. 



The original P. humilis Nutt. is, according to Miss Eastwood, 

 the same as P. collinus A. Nels., which therefore passes into 

 synonymy. Dr. Gray in describing P. humilis* makes Nuttall's 

 plant the type, but evidently had another plant mostly in his 

 mind, viz. Parry 257 and from this we have received our usual 

 idea of P. humilis. This probably should be known as P. albertinus 

 Greene,f which apparently is the same. Professor Nelson gives 

 P. pseiidohumilis Rydb. as a synonym, but this is the same as his 

 own P. Owenii. 



Pentstemon glaucus Graham does not belong to the group where 

 Dr. Gray placed it and has nothing to do with the Rocky Mountain 

 plant P. stenosepalus (Gray) Howell (P. glaucus stenosepalus A. 

 Gray), but belongs to the P. confertus group. It is evidently the 

 same as P. pinetorum Piper or closely related to it. 



Pentstemon Macbridei A. Nels.J and P. perpulcher A. Nels. are 

 apparently P. Cusickii A. Gray and P. unilateralis Rydb., respec- 

 tively. A duplicate of the type of P. Cusickii is in the herbarium 



* Proc. Am. Acad. 6: 69. 1862. 



t Leaflets 1 : 167. 1906. 



t Bot. Gaz. 52: 272, 273. 191 1. 



