Rydberg: Notes on Rosaceae 83 



Potentilla Bruceae is related to P. Breweri, but differs in the 

 fewer, broader, closely approximate pairs of leaflets. It is known 

 from the type locality only. 



Dr. Wolf includes the group in the GRACILES group, which he 

 divides into two divisions. The first, Gracili - pinnatae, compri- 

 ses my Graciles, Rubricai i.i - except P. rubricaulis Lehm.), 

 and Subjugae. He makes Potentilla propingua Rydb. (P. diffusa 

 A. Gray, not Willd.) a variety of P. Hippiana,a.n6 both P. colora- 

 densis and P. rupicola varieties of P. effusa. If the author can be 

 accused of splitting up the species too finely, Dr. Wolf especially 

 in this case can be accused of lumping together rather clearly 

 distinct species. P. propinqua, as known from field study, shows 

 itself very distinct from P. Hip plana, but much less so from the 

 typical P. pulcherrima. Sereno Watson saw this close relationship 

 and united the two under the name P. Hip pinna var. pulcherrima. 

 The main differences are that P. propinqua is usually lower, de- 

 cumbent at the base, and its leaves have 9 leaflets, directed some- 

 what forward; while P. pulcherrima is usually taller, more erect, 

 and its leaves have generally only 5-7 leaflets, of which the lower 

 are spreading or even reflexed. Concerning the relationship of 

 P. pulcherrima to P. gracilis and P. filipes, see my remarks in the 

 Bulletin of the Torrey Botanical Club 37: 491. 28 O 1910. 

 Dr. Wolf proposes a new species, Potentilla Osterhoutiana.* 

 I have not seen the type nor any duplicate thereof. From the 

 description, it seems to me to be a luxuriant form of P. rubripes 

 or else the same as my P. viridior. I have written to Mr. Oster- 

 hout for material, but he has answered me that he has no speci- 

 mens of the number cited by Dr. Wolf. He does not know what 

 it is. From the date and locality given he thinks that it may be 

 P. rubripes.^ 



Multijugae 



This group contains, in the North American Flora, sixteen 

 species, of which Potentilla klamathensis , P. versicolor, and P. Nel- 



* Bibl. Bot. 16: 200. 1908. 



t After this article was written, Mr. G. E. Osterhout has sent me a specimen, 

 Osterhout 1502, which he thin'cs might be P. Osterhoutiana. It is an unusually large 

 specimen of P. rubripes. The only thing that speaks against this being a duplicate 

 of the type of P. Osterhoutiana is that it was collected July 12 instead of July 20. 



