PLANTS OF THE SAN BEENARDINO MOUNTAINS 217 



Lithophragma triloba Rydb. N. A. Fl. 22: 87. 



Occasional on damp shady banks in the Upper Chaparral Zone. 

 Lithophragma tripartita Greene, Eryth. 3: 102. 



Occasional on gravelly slopes, in open pine forest, Bear Valley. 

 Heuchera elegans Abrams, Bull. S. Cal. Acad. 1: 67. 



Fredalba Park, Lower Transition Zone, Grant. 

 Heuchera Ursula Rydb. N. A. Fl. 22: 109. 



Frequent on rocky hillsides, Snow Canon, Hudsonian Zone, type station. 

 Heuchera Parishii Rydb. N. A. Fl. 22: 109. 



Abundant among rocks about Mill Creek Falls (type station), in the 

 Upper Transition Zone. 

 Boykinia roiundifolia Parry; Gray, Proc. Am. Acad. 13: 371. 



Abundant along the borders of streams in the Lower Chaparral Zone; 

 type region. 

 Saxifraga californica Greene, Pitt. 1: 286. 



Occasional on damp banks in the Lower Chaparral Zone. Early spring. 

 Ribes cereum Dougl. Trans. Hort. Soc. Lond. 7: 512. 



Frequent on dry slopes, Holcomb Valley, in the Upper Transition Zone. 

 Ribes hesperium McClatchie, Eryth. 2: 79. 



Frequent in caiions in the Lower Chaparral Zone. 

 Ribes hesperium McClatchie var. amarum Parish, comb. nov. R. amarum McClat- 

 chie, Eryth. 2: 79. 



Frequent with the species, with which it is well connected by intermediate 

 forms. 

 Ribes nevadense Kellogg, Proc. Cal. Acad. 1: 63. 



Frequent on rich slopes in the Upper Chaparral and Lower Transition Zones. 

 Ribes Roezli Regel, Gartenfl. 28: 226. 



On rich banks, Mill Creek Canon, Upper Transition Zone. 



PLATANACEAE 



Plalanu^ racemosa Nutt. N. Am. Syl. 1:47. Sycamore 



Occasional along streams in the Lower Chaparral Zone. 



ROSACEAE 



Sericotheca concolor Rydb. N. A. Fl. 22: 264. 



Occasional in rocky places in the Upper Transition, Canadian and Hud- 

 sonian Zones. 

 Amelanchier alnifolia Nutt. Jour. Acad. Philad. 7: 22. A. venulosa Greene, Pitt. 

 4:21. 

 Abundant on dry hills in Bear Valley in the LTpper Transition, and occa- 

 sional in Cushenberry Canon in the Pinon Zone. 

 Heteromeles arbutifolia Roemer, Syn. Monog. 3: 105. Christmas Berry 



Canons and hillsides in the Lower Chaparral Zone. 

 Horkelia bernardina Rydb. N. A. Fl. 22: 273. 



Frequent on the banks of streams in the Upper Chaparral and Transition 

 Zones; type region. 



