898 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



The plant is browsed when better forage is unavailable. 



Acamptopappus shockleyi A. Gray, of southern Nevada and Inyo County, 

 California, may yet be found in northwestern Arizona. It has radiate heads 

 solitary at the tips of the branches, whereas those of A. sphaerocephalus are 

 discoid and are borne at the tips of cymosely arranged branchlets. 



15. HETEROTHECA. Telegraph-plant 



Annual or biennial herbs, hirsute or hispid, glandular above; leaves 

 alternate, the lower ones usually with a foliaceous stipuliform dila- 

 tion at base of the petiole; heads yellow, medium-sized ; involucre grad- 

 uate, of numerous narrow phyllaries ; ray achenes glabrous or slightly 

 pubescent, essentially epappose; disk achenes densely hairy, their 

 pappus double, the outer series of short bristles or setiform squamellae, 

 the inner series of longer capillary bristles. 



Large coarse plants, browsed by cattle. 



Key to the species 



1. Heads relatively small, the disk in fruit (including the pappus) 8 to 10 mm. 

 high involucre 6 to 8 mm. high; ray achenes glabrous; appendages of the 

 style branches two-thirds as long as the stigmatic region; upper leaves 

 usually with cordate-clasping bases 1. H. sub axillaris. 



1. Heads relatively large, the disk in fruit (including the pappus) 10 to 12 mm. 

 high; involucre 7 to 10 mm. high; ray achenes pubescent at least on the 

 angles; appendages of the style branches about half as long as the stigmatic 

 region; upper leaves usually narrowed at base 2. H. grandiflora. 



1. Heterotheca subaxillaris (Lam.) Britt. and Rusby, N. Y. Acad. Sci. 



Trans. 7: 10. 1887. 



Inula subaxillaris Lam., Encycl. 3: 259. 1789. 

 Heterotheca lamarckii Cass., Diet. Sci. Nat. 21: 131. 1821. 



Yavapai, Gila, Maricopa, Pinal, Cochise, and Pima Counties, 1,000 

 to 5,500 feet, abundant and conspicuous along roads and ditches, 

 March to November. Delaware to Kansas, south to Florida, Texas, 

 Arizona, and Mexico. 



Sometimes known as camphor-weed, because of the odor of the 

 plant. 



2. Heterotheca grandiflora Nutt., Amer. Phil. Soc. Trans, ser. 2, 



7: 315. 1840. 

 Near Prescott (Yavapai County), Santa Rita and Baboquivari 

 Mountains (Pima County), 2,500 to 4,500 feet, thickets and chapar- 

 ral, September and October. California and Arizona. 



16. CHRYSOPSIS. Golden-aster 



Low, pubescent, perennial herbs; leaves alternate, spatulate to 

 oblong or obovate, entire; heads medium-sized, yellow, radiate, usually 

 few and cymose; involucre graduated; achenes compressed; pappus 

 double in both the ray and the disk flowers, the outer series of short 

 squamellae or squamellate bristles, the inner series of much longer 

 capillary bristles. 



Key to the species 



1. Whole plant silvery-silky; heads very large (disk in fruit 1 to 1.5 cm. high), 

 leafy-bracted, the bracts surpassing the proper involucre and usually also 

 the heads 1. C. rutteri. 



1. Plant not silvery-silky, or else the heads smaller (disk in fruit 1 cm. high or less), 

 or not leafy-bracted (2). 



