B13 

 (leaf 2) 



sheep are the least susceptible. However, symptoms are readily pro- 

 duced in cattle, horses, and sheep by consumption of small amounts 

 of this plant, especially when it is fed with very little supplemental 

 forage. 



Fortunately, jimmy weed normally is unpalatable to all classes of 

 livestock and is not eaten except during scarcity of palatable forage. 

 Losses occur chiefly on overgrazed ranges, especially in winter and 

 spring, when other forage is usually scant. Proper range manage- 

 ment, therefore, is the practical expedient for preventing jimmy weed 

 poisoning. Stockmen maintain that it is practical to eliminate this 

 plant from pastures by grubbing.- The late Dr. Marsh stated 3 that 

 the closely related burroweed (A. fruticosus, syns. Biffelovia coro- 

 nopifolia, Isocoma cor onopif olio,, I. fruticom) of western Texas, 

 southern Arizona, and Sonora, produces the same harmful effects as 

 jimmy weed. 



The late Dr. Hall 4 regarded Aplopappus heter&phyllits as a 

 synonym of A. yluriftorus. In view of the uncertainty as to the 

 identity of the obscure eastern Colorado plant, Linosyris pluriflora 

 (on which Hall based the combination, Aplopappus plwriflorw) Dr. 

 S. F. Blake, composite expert of the Bureau of Plant Industry, rec- 

 ommends continuation of the name A. Jieterophyllus for jimmy weed, 

 pending further study of the matter. Hall recommended the spell- 

 ing Haplopappus for this genus, as better preserving the etymology. 

 The original spelling, Aplopappus, is preferred by most botanists 

 and is almost universal in publication. 



GOLDENWEEDS AND THEIR CONGENERS 



(Aplopap'pus spp.) 



Aplopappus is a large and variable genus, greatly confused in 

 botanical literature; groups of what is considered Aplopappus (fide 

 Blake) in this handbook, have been variously considered under the 

 genera Chrysoma, Ericametia, Eriocarpum, Isocoma, Linosyris, 

 Mawonema, Pyrrocoma., Sideranthus, Stenatus, and Tonestus. Bige- 

 lo-via, is also considered synonymous in part. Many of these plants 

 are often called rayless-goldenrod. The genus is largely herbaceous, 

 although many species are half shrubs with woody roots and crowns ; 

 a considerable number are definitely woody shrubs. 



The goldenweeds and their sister species of the genus are common 

 plants and, although usually scattered, are widely distributed over 

 the western ranges. Few of the species have individual common 

 names. They occur mainly on semidesert areas, although a small 

 number of species range into the ponderosa-pine and spruce-fir types. 

 A few herbaceous species, such as A.falcatus (syn.Stenotwfalcatm), 

 furnish fairly good winter sheep feed. However, the genus, as a 

 whole, is very low in palatability, most species being practically 



2 See footnote on preceding page. 



* Marsh, C. D. STOCK-POISONING PLANTS OF THE RANGE. U. S. Dept. Agr. Bull. 1245, 

 rev., 75 pp., illus. 1929. Supersedes Bull. 575. 



4 Hall, H. M. THE GENUS HAPLOPAPPUS. A PHYLOGENBTIC STUDY IN THE COMPOSITAB. 



Carnegie Inst. Wash. Pub. 389, 391 pp., illus. 1928. 



