RyDBERG: 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 6890. 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. obovatifolia, which 
was based on Pringle 6890. Dr. Wolf has committed another 
grave blunder, for on page 251 he reduces P. obovatifolia to a 
variety of P. concinnaeformis. Here he also cites Pringle 6890, 
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. obovatifolia a variety of P. concinnaeformis, 
because of my statement that it was nearest P. concinnaeformis 
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. obovatifolia: 
Mexico: Sierra de Pachuca, Hidalgo, 1898, Pringle 6890; 
also in 1902, Pringle 9783; Cuyamaloya, Hidalgo, 1906, Pringle 
10276. 
HorrRIDAE 
This group contains two Mexican species, known only 
from the type collections. Potentilla horrida is referred to the 
HAEMATOCHROAE group by Dr. Wolf, 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. 
