FLOWERING PLANTS AND FERNS OF ARIZONA 391 



the Grand Canyon, dry rock ledges, often of limestone, July to Sep- 

 tember. South Dakota and Montana to New Mexico, Arizona, and 

 California. 



Both the typical form and var. elatior S. Wats. (Petrophyton elatius 

 Heller) are common, intergrading freely but the variety normally 

 with a longer, frequently branched inflorescence and longer floral 

 bracts. 



3. CHAMAEBATIARIA. Fernbush 



A shrub, commonly 1.5 to 2 m. high, very leafy, aromatic; leaves 

 more or less evergreen, much dissected, the ultimate segments very 

 small; flowers numerous, in panicles; petals white; fruits of follicles. 



1. Chamaebatiaria millefolium (Torr.) Maxim., Acta Hort. Petrop. 



6: 225. 1879. 



Spiraea millefolium Torr., U. S. Rpt. Expl. Miss. Pacif. 4: 83. 



1857. 



Coconino, eastern Mohave, and northern Yavapai Counties, 4,500 

 to 7,000 feet, often with pinyons and junipers, July and August. 

 Idaho to Arizona and California. 



Browsed by sheep, goats, and deer, apparently not by cattle. 



4. VAUQTJELINIA 



A large shrub or small tree ; leaves evergreen, simple, with lanceolate 

 serrate blades; flowers numerous, in flat-topped cymose panicles; 

 petals white; stamens 15 or more; pistils 5, coherent at base, becoming 

 somewhat woody follicles. 



1. Vauquelinia californica (Torr.) Sarg., Gard. and Forest 2: 400. 1889. 



Spiraea californica Torr. in Emory, Mil. Reconn. 140. 1848. 



Mountains of Maricopa, Pinal, and Pima Counties, 2,500 to 5,000 

 feet, often among live oaks, May and June, type collected by Emory 

 on mountains along the Gila River. Arizona and northern Mexico. 



Arizona-rosewood. The wood is close-grained, hard, and heavy, 

 but the trunks probably are too small to warrant exploitation. 



5. HOLODISCUS. Oceans-pray 



Shrub, up to 3 m. high, much branched; leaves deciduous, simple, 

 the blades obovate-cuneate, coarsely crenate with few teeth, white- 

 sericeous or sparsely villous beneath; flowers in ample terminal 

 panicles, or the inflorescence reduced to a small raceme; flowers small; 

 calyx and petals cream-colored; stamens many; pistils 5. 



1. Holodiscus discolor (Pursh) Maxim., Acta Hort. Petrop. 6: 253. 

 1879. 



Spiraea discolor Pursh, Fl. Amer. Sept. 342. 1814. 

 Sericotheca discolor Rydb., North Amer. Fl. 22: 262. 1908. 



Apache County to Mohave County, south to Cochise and Pima 

 Counties, 5,500 to 9,500 feet, commonly in pine or spruce forests, 

 often on cliffs, June to September. Montana to Oregon, south to 

 northern M cxico . 



A beautiful shrub with aromatic foliage, sometimes called foambush, 



