Bailey ac Bailey: Woody Plants of National Parks 159 



of bigtooth maple shows considerable resemblance to that of sugar maple of 

 the eastern states and it 's interesting to note that it has been reported that 

 sugar has been obtained from the sap of this western species also. 



Occurrence. — MESA VERDE. ZION, common along streams and in moist places, 4,230 

 to 6,000 feet: East Rim trail above Weeping Rock; Birch Creek trail near junction of 

 trail to Lady Mountain; Narrows trail. GRAND CANYON, 5,000 to 7,500 feet. North 

 Rim, common just below the rim. South Rim, rare below the rim. Canyon, occasional in 

 moist places, especially on the north side of the Colorado River: Kaibab trail above 

 Roaring Springs junction; Roaring Springs. 



3. Rocky Mountain Maple (Acer glabmm Torr.), fig. 92. — Slender- 

 stemmed shrub 4 to 12 feet high, or a small tree with smooth reddish-brown 

 trunk and narrow crown of straight slender branches pointing upwards; leaves 

 1 to 3 inches across, smooth on both sides, deeply 3- to 5-lobed with V-shaped 

 notches, or sometimes divided into 3 leaflets, the margins unevenly toothed; 

 flowers greenish-yellow, borne in loose drooping clusters; wings of fruits spread- 

 ing obliquely, forming more or less right angles or sometimes nearly parallel, 

 often reddish; found commonly in moist locations along streams, in canyons, 

 and on shaded flats as undercover in the forests. In certain areas the leaves 

 are conspicuous because of brilliant red spots due to insect galls. 



Several varieties of Rocky Mountain maple have been described, the variety 

 Doiiglasi being the one most commonly recognized. The leaves are generally 

 3-Iobed and the fruits somewhat stouter with more or less parallel wings. Be- 

 cause of the difficulties in distinguishing between the varieties, no segregation 

 is made in the parks listed here. 



Occurrence. — OLYMPIC: Elwha River at junction of Godkin Creek; Crystal Creek; 

 Mount Angeles. MOUNT RAINIER, occasional, 2,000 feet: Longmire; Sunset Park road. 

 CRATER LAKE: trail to boat landing; Round Top; Wine-glass; Whitehorse Bluff. LAS- 



Fig. 92. Rocky Mountain maple {Acer glabrum) . 



