Bailey & Bailey: Woody Plants of National Parks 249 



linear-oblong, sharp-pointed at the tips, mostly green, especially towards the 

 tips, rough-glandular; ray flowers none; seed-like achenes densely hairy; pappus 

 bristles unequal, some slightly flattened, reddish-brown. 



Occurrence. — BRYCE canyon. GRy\ND canyon, on the North Rim. 



12. Ironplant Goldenweed (Aplopappus spinulosui (Pursh) DC. 

 var. Gooddmgi (Nels.) Blake). — Stems erect or somewhat spreading from 

 a woody base, 1 to I1/2 feet high, the herbage bright green; leaves 1/2 to 2 

 inches long, deeply divided into several linear bristle-tipped lobes, the lobes 

 often again toothed with narrow teeth; upper leaves smaller than the lower; 

 heads borne singly at the ends of leafy or nearly leafless branches; involucre 

 hemispheric, I/4 to nearly 1/2 inch high, 1/2 to % inch across; involucral bracts 

 numerous, linear, pointed, usually bristle-tipped, thin, the middle portion 

 green; petal-like ray flowers 15 to 50, about % to 1/2 inch long; seed-like 

 achenes narrowly top-shaped, densely hairy; pappus bristles unequal, rather 

 scanty, brownish. 



Occurrence. — GRAND CANYON, in the canyon, 3,000 to 4,000 feet: Kaibab trail on 

 the Tonto south of the Colorado River. 



Rayless Goldenhead (Acamptopappus sphaerocephalus Gray). — Low, 

 round-topped bush, 1 to 2 (or 3) feet high, much-branched, the older stems 

 whitish, the bark becoming stringy; leaves small, about y^ to % inch long, 

 oblong to linear, more or less erect along the branches; flower-heads more or 

 less rounded, about I/4 to 1/2 inch wide, the heads borne along the upper parts 

 of the stems and forming large more or less flat-topped clusters; flowers yellow; 

 petal-like ray flowers lacking; bracts surrounding the heads papery, straw- 

 colored or greenish, with fringed membranous margins, mostly rounded at 

 the tips, loosely overlapping each other; small seed-like fruits (achenes) nar- 

 rowly top-shaped, very densely white-hairy, the pappus bristles at the top 

 of the achene white or somewhat tawny. 



Occurrence. — ZION : hills above Coalpits Wash, 4,000 feet. GRAND CANYON. 



Arrow- WEED Pluchea (Pluchea sericea (Nutt.) Gov.). — Slender erect 

 shrub 3 to 10 feet high; leaves silvery-white but scarcely hairy, linear to lance- 

 shaped, 1/2 to about I1/2 inches long, not stalked; flowers purplish-pink; heads 

 about I/4 to 1/3 inch high, hemispheric, borne in more or less oblong to 

 rounded or flat-topped clusters at the ends of the branches; involucre com- 

 posed of overlapping scales; seed-like achenes crowned with a single row of 

 hair-like pappus bristles, occurs commonly on sandy washes or sand bars. 



Occurrence. — ZION : mouth of Coalpits Wash, 4,000 feet. GRAND CANYON, in the 

 Canyon, 2,500 feet: sandy wash along the Colorado River near the mouth of Bright 

 Angel Creek; forms tall thickets at edge of trail along Bright Angel Creek near Phan- 

 tom Ranch. 



Bur-sage (Franseria Cav.) 



There are two species of bur-sage in the parks, both found at Grand 

 Canyon. The plants are low, rigidly-branched shrubs with a grayish aspect 

 typical of many of the desert plants. The male and female flowers occur 



