RYDBERG: NOTES ON ROSACEAE 495 
is in A. sericea and A. turbinata. A. gracilipes was first described 
as a Potentilla. In this respect it has had the same fate as A. 
turbinata. 
Acomastylis sericea Greene has a more western and northern 
distribution than A. turbinata (Rydb.) Greene. The following 
specimens have been seen. 
NEvADA: Ruby Mountains, Heller 91309, 9350; East Hum- 
bolt Mountains, Watson 320; same locality, M. E. Jones 1897. 
IDAHO: Salmon River Mountains, Henderson 4035. 
Montana: Indian Creek and Pony, Rydberg & Bessey 4416, 
4417; Spanish Peaks, Flodman 608; Belt Mountains, Scribner 
40; Rone Mountain, Chestnut 9. ° 
Wyominc: Wind River Mountains, V. Bailey; northwestern 
Wyoming, Rose 290. 
Acomastylis turbinata (Rydb.) Greene. The range of this 
species covers that of the preceding, but includes also Colorado, 
Utah, Arizona and New Mexico. 
COWANIA 
Cowania mexicana D. Don is not found within the United 
States, and not even near the boundary. It is confined to central 
Mexico. The plant of southwestern United States and northern 
Mexico should be known as C. Stansburiana Torr., which differs 
in the form of the hypanthium and the lobing of the leaves. C. 
mexicana is represented by the following specimens: 
Mexico: Durango, 1896, Palmer 12, 71; Nelson 4696; Sierra 
Madre, Seeman; Hartweg. 
Cowania Davidsonii Rydb. is closely related to C. Stansburiana, 
but differs in the elongated pedicels, the form of the hypanthium, 
etc. The following specimens belong to it: 
ARIZONA: Blue River, September 8, 1902, A. Davidson 754; 
Castle Creek, Bradstran Mountains, 1892, Toumey 129d. 
Cowania alba Goodding is unknown to me, except as to a poor 
fragment collected by Purpus and as to the descriptions. Purpus’ 
specimens may well represent a hybrid of C. Stansburiana and 
Kunizia tridentata. 
Cowania ericaefolia Torr. and C. Howardi S. Wats. are the 
same. The writer has seen the types of the two, which are 
