Rydbekg : Notes on Rosaceae 493 



P. leptopetala, nor the plants collected by Schiede and by Ehrenberg, 

 enumerated in Linnaea. From certain remarks there I have sus- 

 pected that these specimens belonged rather to the same species 

 as Pringle 6890 than to the typical P. leptopetala. Dr. Wolf, on 

 page 228 of his monograph, also states that these specimens agree 

 very well with Pringle 68go. From this I may judge that Dr. 

 Wolf's interpretation of my P. staminea is wrong and that his 

 P. leptopetala staminea is the same as my P. obovatijolia, which 

 was based on Pringle 68go. Dr. Wolf has committed another 

 grave blunder, for on page 251 he reduces P. obovatijolia to a 

 variety of P. concinnaejormis. Here he also cites Pringle 68qo, 

 overlooking the fact that he had already cited the same number 

 under P. leptopetala staminea. When preparing the manuscript 

 for page 228, he evidently had the specimen before him, while 

 when doing the same for page 251, he made use of no specimens 

 and simply made P. obovatijolia a variety of P. concinnaejormis, 

 because of my statement that it was nearest P. concinnaejormis 

 of the Concinnae group. From his treatment of P. concinnae- 

 jormis, it is evident that Dr. Wolf had seen no specimens of that 

 species. All he had to go by was the short description and plate 

 in my monograph. I think it rather audacious to reduce one 

 species to a variety of another, without knowing material of 

 either. The following specimens belong to P. obovatijolia: 



Mexico: Sierra de Pachuca, Hidalgo, 1898, Pringle 6890; 

 also in 1902, Pringle 9783; Cuyamaloya, Hidalgo. 1906, Pringle 

 10276. 



Horridae 



This group contains two Mexican species, known only 

 from the type collections. Potentilla liorrida is referred to the 

 Haematochroae group by Dr. W'olf, notwithstanding its yellow 

 flowers. P. durangensis is described as new in the North Ameri- 

 can Flora. 



Rubrae 



The oldest known species of this group is Potentilla coma- 

 rioides Humb. & Bonp. Unfortunately this universally known 

 name is antedated by one year by P. rubra Willd., which name 

 must be adopted. The group contains seven species from northern 

 Mexico and the southwestern United States. Of these, P. 



