Bailey & Bailey: Woody Plants of National Parks 255 



the canyon, 2,300 to 3,800 feet: Garden Creek near Indian Gardens; Pipe Creek; 

 Shinumo Creek; Bright Angel Creek at Phantom Ranch and for several miles above. 



3. Squaw Baccharis, Squaw Waterweed (Baccharis sergiloides 

 Gray) . — Much-branched broom-like shrub little resembling the other species 

 of Baccharis; bushes li/4 to 4 feet high in our area; branches green, 4-angIed; 

 herbage glutinous; leaves rather sparse, narrowly oblong to spatula-shaped, 

 1/2 to 1 inch long, the margins not toothed or with few teeth; flower heads 

 small, borne in nearly leafless branched clusters; involucral bracts stiff, oblong- 

 egg-shaped; seed-like achenes smooth; pappus bristles rather stiff and sparse 

 in the staminate (male) flowers, becoming slightly wider towards the tip, that 

 of the pistillate (seed-bearing) flowers hair-like and the bristles more copious. 



Occurrence. — GRAND CANYON, occasional in the canyon, 2,500 to 3,5CO feet: Bright 

 Angel trail along upper switchbacks above Pipe Creek; Kaibab trail along switchbacks 

 below the Tip-off; Phantom Ranch; Kaibab trail along Bright Angel Creek about 2J/2 

 miles above Phantom Ranch. 



Mohave Aster (Aster abatus Blake), fig. 146. — Low bushy plant 1 to 2 

 feet high, with wiry branches spreading from a woody base; bark smooth, 

 whitish; leaves I1/2 to 3 inches long, lance-shaped to oblong, the margins 

 spine-toothed; flower heads showy, about 2 inches across; ray flowers bluish- 

 violet, the centers yellow. (Syn. Aster tortifolius (T. & G.) Gray.) 



Occurrence. — GRAND canyon, in the Canyon: Kaibab Trail below the Tonto on 

 the south side of the Colorado River. 



Brittlebush, Incienso (Encelia Adans.) 



Field Guide to the Species 



Leaves green, roughish; flower-heads without ray flowers, borne singly at the ends 



of the branches I. E. frulescens. 



Leaves white-woolly; flower-heads with ray flowers, borne several on short branciilets 



at the ends of the stems 2. E. farinosa. 



1. Smooth Brittlebush (Encelia frutescens Gray). — Low round- 

 topped shrubs, mostly 1 to 3 feet high; leaves green, egg-shaped to oblong, 

 with 3 main veins from the base, the margins not toothed; flowers yellow, the 

 heads about I/2 inch across, without petal-like ray flowers, borne at the ends 

 of long naked stems which stand out above the rounded and often rather 

 dense crown of foliage; bracts of involucre surrounding the heads dry and 

 papery with conspicuous longitudinal striations, the margins hairy; seed-like 

 achenes black, without a pappus crown or rarely with 2 slender hairs. 



Occurrence. — ZION. GRAND CANYON, common in the canyon, 3,000 to 4,000 feet: 

 Indian Gadens ; Kaibab trail on the Tonto on both sides of the Colorado River. 



2. Woolly Brittlebush (Encelia farinosa Gray). — Similar to smooth 

 brittlebush except the leaves whitish on both sides with a fine white wool; 

 flower heads several on short branchlets at the ends of the erect naked stems, 

 with 10 to 18 showy petal -like ray flowers. 



Occurrence. — grand canyon, common in the canyon, 2,500 to 3,500 feet: Bright 

 Angel trail near Colorado River; Phantom Ranch; Kaibab trail several miles north of 

 Phantom Ranch. 



