Bailey &c Bailey: Woody Plants of National Parks 



131 



as the tiny capsules develop. (Syn. Spiraea discolor Pursh, Sericotheca dis- 

 color Rydb.). 



Occurrence. — OLYMPIC, common, up to 2,000 feet: Mount Angeles; Hayes River 

 trail; trail to Constance Ridge; Duckabush River. MOUNT RAINIER, common: head of 

 Carbon River, 3,800 feet; Nisqually Valley. CRATER LAKE, rare at lower elevations: 

 lower Annie Creek canyon; Crescent Ridge; near Pole Bridge. GLACIER, occasional, 

 3.000 to 6,000 feet: Belton Hills; Lake McDonald; highway along St. Mary Lake; 

 upper Coal Creek. 



la. Bush RocKSPiRAEA (Var. diunosus (Nutt.) Dippel). — Erect shrubs 

 3 to 6 feet high; leaf-blades % to 2 or more inches long, densely white-silky 

 below; flower-clusters much-branched. (Syn. Spiraea dumosa Nutt.). 



Occurrence. — ROCKY MOUNTAIN, in rocky canyons. 



Fig. 66. Creambush rockspiraea (^Holodiscus discolor). 



