150 NORTH AMERICAN FAUNA. [no. 16. 



Potentilla glandulosa Liiidl. Large Yellow I'oteiitilla. 



A large PotentiUa from the Transition zone, near Wagon Camp, is 

 identified by Mr. Ivydberg as P. glandido.sd. 



Rosa californica 0. & S. California Hose. 



Abundant in moist places in the Transition zone near Sisson Tavern 

 and along the east base of Mount Kddy. 



Rosa gymnocarpa Nntt. Wihl Hose. 



Ooninion in places in the Transition zone, particularly a little below 

 Wagon Camp. 



Rubus parviflorus Xutt. [ = R. nufl-aniis Auct. 1 Western Thimbleb<'rry. 

 Common in cool moist places in McCloud Valley and at Sisson, and 

 thence up througli the Transition zone to an altitude of 5,200 feet on 

 the road to Wagon Camp, and G,000 feet along Squaw Creek an«l in 

 Mud Creelv Canyon. Most of the Transition slopes of Sliasta are too 

 dry for the thimbleberry. 



Rubus vitifolius C. & S. Blackberry. 



Common in cool moist i)laces in the Transition zone near Sisson and 

 along the east base of tlie Scott ]\rountains. 



Sibbaldia procumbens Linn. Alpine Sibbaldia. 



Common in the Hudsonian zone near timberline, i)articularly in 

 springy places and in the heather beds. Usually occurs in small 

 patches below extreme timberline. 

 Amelanchier alnifolia >utt. Serviceberry. 



Abundant in moderately moist parts of the Transition zone. On the 

 west and southwest sides of the mountain it reaches from Sisson to 

 Wagon Camp. On a warm southwest slope on the steep ridge between 

 Mud Creek Canyon and Clear Creek it occurs, with several other 

 Transition zone species, at the unusual altitude of about 7,00(» feet. 

 (Seep. 49.) 



Crataegus rivularis Nntt. Black Uaw. 



Common in the Transition zone about tlie west base of Shasta, par- 

 ticulaily ahmg streams at the east base of Mount l^^ddy, from tlic liead 

 of the Sacramento northward, usually in cool moist soil. Common near 

 Sisson Tavern. 



Sorbus sambucifolia (C. & S.). jMountain Ash. 



Rather scarce and conlined cliietly to the relatively moist Transition 

 zone slopes of the canyons. In Mud Creek Canyon it was f(Mind along 

 the bottom from ."),(;0() feet to (»,7()0 feet, .\long Sijuaw Creek it was 

 found at about 5,500 feet. 



Cerasus demissa (Nutt.). Western Chokecherry. 



Common in places in the lower part oltlie 'I'ransition zone. Observed 

 on tlie sontli slope above ^McCIond ^lill, mainly in the gulches; also i:i 

 the neighitorhood of Sisson, and near the sonth end of Shasta \'alley. 



