RHAMNUS AND PUCCINIA 
269 
Washington, No. 3885 ('A. A. & Gertrude Heller) 
Defiance Park, Tacoma, Washington (L. H. Pammel) 
Rhamnus Smithii Greene. This species was described by 
Greene 6 from specimens collected at Pagosa Springs, southwest- 
ern Colorado, and its range is given as southern Colorado and 
northern New Mexico. E. O. Wooten and P. C. Standley 7 record 
it from Ghana between Tierra Amarilla and Park View in New 
Mexico. The only specimens I have seen are those of Miss 
Florence Willey, from Pagosa Springs, Colorado, and another 
from the same place by Willey, Clokey and Bethel. This seems 
to me to be closely allied to R. Calif ornica in some respects. Per- 
haps it should be regarded as distinct. 
Rhamnus N evadensis Aven Nelson. Dr. Aven Nelson 8 has 
described this species from Nevada and states that it differs from 
R. Calif ornica Esch in its non-coriaceous leaves and its short 
calyx lobes. The R. Calif ornica in the Rocky Mountain her- 
barium, collected at Verdi, Nevada, by B. P. Kennedy, No. 953, 
and the one collected by Marcus E. Jones at Reno seem to me to 
be pretty closely related to R. Calif ornica. There are some slight 
differences in the leaves of the Nevada specimens, which are 
somewhat more narrow than R. Calif ornica. I do not find much 
difference in the calyx lobes. The California buckthorn is an 
extremely variable plant. 
Rhamnus alnifolia L. Her. This is a low shrub with pubescent 
branches, leaves short petioled, ovate or broadly elliptical, glan- 
dular serrate. It is of course a common species in the northern 
states, not common in California. We have the following spec- 
imens in our collection from the west and northwest. 
Sierra County, California (J. G. Lemmon) 
Northern Pacific Coast (C. C. Parry) 
Obsidian Creek, Yellowstone National Park (Aven and Elias 
Nelson) 
Bitter Root Valley Warm Springs Creek (L. H. Pammel and 
H. S. Fawcett) 
Rhamnus crocea Nutt. This is an evergreen low spreading 
shrub with reddish bark, leaves glossy, roundish or broadly ovate 
or elliptical, glandfilar dentate. This species has the most re- 
stricted distribution. It evidently belongs to the Mexican flora 
and is most common in Southern California. Specimen were 
collected by Parry near San Diego (Mexican Boundary Survey), 
6 Pittonia. 3: 17. 
7 Flora of New Mexico, 415. 
6 Proc. Biol. Soc. of Wash., 18: 174. 
