FLOWERING PLANTS AXD FERNS OF ARIZONA 997 



1. Anthemis cotula L., Sp. PL 894. 1753. 



Maruta cotula DC, Prodr. 6: 13. 1837. 



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

 8.000 feet, roadsides and waste places, April to Jul}'. Throughout 

 most of the United States and Canada: naturalized from Eurasia. 



Mayweed, dogfennel. The powdered flowers are effective against 

 bedbugs, fleas, and flies. A decoction of the leaves may also be 

 employed as an insecticide. 



107. ACHILLEA. Yarrow, milfoil 



Perennial herbs, usually less than 0.5 m. high, thinly or densely 

 pilose, sometimes silky-canescent, leafy, with creeping rootstocks; 

 leaves linear to oblong, finely dissected into very numerous, short, 

 linear to ovate, callous-cuspidate divisions not more than 1 mm. 

 wide; heads small, numerous, in a dense corymbose terminal panicle, 

 both the rays and the disk white; rays small, roundish, about 2 mm. 

 long; receptacle with scarious chaff; pappus none. 



A. millefolium L., a European species extensively naturalized in the 

 eastern United States, contains achilleine, a drug sometimes used in 

 acute suppression of the menses. It was formerly prescribed as a 

 tonic and in urinary disorders. Mrs. Collom (ms.) reports that a 

 decoction of the leaves and flowers of A. lanulosa is used in family 

 medicine in Arizona. 



1. Achillea lanulosa Xutt., Acad. Nat. Sci. Phila. Jour. 7: 36. 1834. 



Apache, Navajo, and Coconino Counties to Cochise and Pima 

 Counties, 5,300 to 11,300 feet, mostly in the mountains, common in 

 yellow pine forests, June to September. Manitoba to British Colum- 

 bia, south to Kansas, New Mexico, Arizona, California, and northern 

 Mexico. 



In var. alpicola Rydb. {A. subalpina Greene, A. alpicola Rydb.). 

 seen from the San Francisco Peaks, Coconino County, and Baldy 

 Peak, Apache County, 8,400 to 11,280 feet, the margins of the phyl- 

 laries are dark brown, whereas they are straw-colored to pale brown 

 in the typical form. 



Achillea lanulosa, western yarrow, a certainly indigenous plant, is 

 not clearly distinguishable from the introduced A. millejolium com- 

 mon in the eastern United States. Specimens from the Chiricahua 

 Mountains (Blumer 1340) are suggestive of A. mill folium. A collec- 

 tion from the north end of the Carrizo Mountains, Apache County 

 (Standley 7379), has comparatively large heads and large leaves with 

 remote divisions, and has been referred to .4. laxiflora Pollard and 

 Cockerell, but does not seem to be specifically distinct from other 

 Arizona material. 



107a. LEUCAMPYX 



Leucampyx newberryi A. Gray is known definitely only from Colorado and 

 New Mexico. Hymenopappus radiatus Rose, very similar in practically all 

 characters except the naked receptacle (that of Leucampyx bearing a broad mem- 

 branous pale at the base of each flower', has sometimes been mistaken for it. 

 The only specimen of Leucampyx allegedly from Arizona examined is one in the 

 U. S. National Herbarium, labeled "Arizona, Dr. E. Palmer, 1872" in George 

 Yasey's handwriting, and bearing the identification by Dr. Gray and his note 

 "new to Arizona." The species was not recorded from Arizona in the Synoptical 



