KEY TO IMPORTANT WOODY PLANTS 135 



bud scales several, unequal, overlapping, sometimes 

 appearing twisted, outer ones stipulelike, less hairy 

 than inner ones; stipules sometimes remaining at- 

 tached to base of persistent leafstalks after leaflets 

 fall; stipule sears absent; leaf scars crescent- to 

 broadly U- or V-shaped, raised on narrow darkened 

 ledges, often with band of tiny reddish glands along 

 inner border or around bud base; bundle traces 

 usually 5, arranged in a single curved line; low to 

 tall, few-branched mountain shrubs often growing 

 in clumps in or near clearings in moist wooded 

 sites, Cascades, Blue and Wallowa Mts., e. Oreg., 



e. Wash. mountain-ashes (Sorbus spp.). 



13. Buds dull brown, finely yellowish- to gold-brown- 

 hairy; lowest bud scales often red or purplish; 

 "berries" red with whitish-waxy "bloom," ellips- 

 oid, 14-40, in roundish-topped clusters; seeds 

 dark or chestnut brown, oval to egg-shaped, 

 somewhat flattened; pointed and lop-sided at 

 base; bark gray; pores (lenticels) oblong; shrubs 

 2-10 feet high; Cascades (also Coast Ranges), at 

 4,000 feet in n. Wash, to 7,500 feet in s. Oreg.; 

 type locality, Cascades, 49° X. lat. 



western mountain-ash (Sorbus occidentalis). 

 13. Buds shiny, sticky or gummy, greenish or green- 

 ish-brown, white-hairy (sometimes only sparsely 

 so) ; "berries" globe-shaped. 

 14. "Berries" glossy, orange to scarlet, 80-200, in 

 dense, flat-topped clusters; seeds light brown, 

 oblong; bark reddish, thick; pores elongate; 

 bud scales usually sparsely white-hairy; shrubs 

 to 13 feet high; conspicuous on lower slopes, 

 e. watershed of Cascades; the only native 

 mountain-ash in Wallowa and Blue Mts., ne. 

 Oreg., se. Wash.; type locality, near Pagosa 

 Peak at 9,000 feet alt., sw. Colo. 

 Greenes mountain-ash (Sorbus scopulina) . 30 

 14. "Berries" scarlet, often with whitish-waxy 

 "bloom", 30-60, in somewhat roundish-topped 

 (convex) clusters; seeds dark brown, egg- 

 shaped, flattened; bark gray; pores nearly circu- 

 lar; bud scales (at least the inner) often rather 

 densely white-hairy; shrubs to nearly 17 feet 

 high; mostly w. side of Cascades, at elevations 

 of 3,000 feet in n. Wash, to 6,000 feet near 

 Crater Lake, s. Oreg.; type locality, Frog 

 Heaven, Mt. Rainier. Wash. 



Cascades mountain-ash (Sorbus 

 cascadensis). 30 



30 Greenes mountain-ash and Cascades mountain-ash have both been confused 

 with Sitka mountain-ash (Sorbus sitchensis) and with Siberian mountain-ash 

 (<S. sambucifolia) neither of which occurs in ^Yashington or Oregon; both Sitka 

 mountain-ash and Siberian mountain-ash have the yellowish- or golden-brown 

 hairiness characterise of western mountain-ash (Sorbus occidentalis). 



