56 



HANDBOOK 14 8, U.S. DEPARTMENT OF AGRICULTURE 



15. Leafstalk and leaf-blade base without pinhead-sized 

 glands. 

 19. Leaves pinnately lobed (each lobe with 2-6 abruptly 

 short-pointed teeth), broadly egg-shaped, square-cut 

 at base, to 4 inches long and 3 inches wide, green 

 above, paler and often densely gray- or whitish-hairy 

 beneath; flowers tiny, creamy white, in showy, 

 much-branched end clusters (panicles); "seeds" 

 (achenes) tiny, 5 to each flower, beaked, long-soft- 

 hairy, winter-persistent, in clusters distinctive even 

 at a distance; erect shrubs to 20 feet high; open 

 woods, cutover lands, canyon bottoms, e. Oreg., 

 e. Wash., also w. of Cascades; type locality, banks 

 of Clearwater River, Idaho. 



creambush rockspirea, or oceanspray 



(Holodiscus discolor). 



19. Leaves not pinnately lobed as above. 



20. Leaf margins distinctly (sometimes coarsely 



and/or doubly) toothed, at least on upper part. 



[Alternate 20* p. 64] 



21. Mistlike gland droplets on leaves and twigs; 



leaves to 1 inch long, broadly rounded and 



toothed at tip, wedge-shaped and entire at 



base, hairy to nearly hairless; twigs often 



sharp-tipped ; bark dark red, aging gray, flaking 



off; flowers, fruits like those of creambush 



rockspirea but in smaller, narrower clusters; 



low, spreading shrubs of dry mountain sites, 



e. Oreg., not reported from Wash.; type 



locality, Steens Mts., s. Oreg. 



glandular littleleaf rockspirea 



(Holodiscus microphyllus var. glabrescens). 



21. Mistlike gland droplets lacking on leaves and 



twigs. 



22. True end buds, stipules and stipule scars 



lacking; twig tips dying back to topmost side 



buds; leaf scars with single bundle trace; 



Creambush rockspirea 



K-404044 



Glandular littleleaf rockspirea 



