FLOWERING PLANTS AND FERNS OF ARIZONA 1003 



2 m. (7 feet) or more where conditions permit. A good growth of this 

 sagebrush indicates a deep, fertile, nonsaline soil. 



13. Artemisia nova A. Nels., Torrey Bot. Club Bui. 27: 274. 1900. 

 Navajo Indian Reservation (Apache and Navajo Counties), Kaibab 



Plateau and Grand Canyon (Coconino County), 6,000 to 7,000 feet, 

 dry slopes and mesas, usually in shallow stony soil, August and Septem- 

 ber. Montana to New Mexico, northern Arizona, and California. 

 A small shrub. 



14. Artemisia spinescens D. C. Eaton in King, Geol. Expl. 40th Par. 



5: 180. 1871. 



Picrothamnus desertorum Xutt., Amer. Phil. Soc. Trans, ser. 2, 

 7: 417. 1841. Xot A. desertorum Spreng., 1826. 



Northern Apache Countv, Carrizo Mountains and near Rock Point 

 (Standley 7479, Peebles and Smith 13545), 5,500 to 6,000 feet, dry 

 slopes and mesas, often in saline soil. Montana to Oregon, south to 

 Xew Mexico, northeastern Arizona, and California. 



Bud-sage, a small rigid, spiny shrub, very resistant to drought 

 and overgrazing. 



110a. LEPIDOSPARTUM. Scalebroom 



Lepidospartum squamatum A. Gray was reported by Gray 9 from "Desert of the 

 Colorado, Arizona, 1870. Dr. Palmer." This reference was To a peculiar form, 

 Linosyris squamata var. palmeri A. Gray, now Lepidospartum squamatum var. 

 palmeri (A. Gray) L. C. Wheeler. According to L. C. Wheeler, 10 Palmer's plant 

 probably came from near Whitewater, Riverside County, Calif. Practically 

 all later authors have continued to include Arizona in the range of the species, but 

 not one has cited material from the State. It seems advisable to exclude Lepido- 

 spartum from the flora of Arizona until actual specimens are forthcoming. 



111. ARNICA 



Low pubescent perennial herbs; leaves opposite; heads solitary or 

 few, rather large, long-peduncled, yellow, radiate; involucre 2 -seriate, 

 equal, of thin, subherbaceous, lance-oblong, acute or acuminate 

 phyllaries; pappus of barbellate bristles. 



Tincture of arnica is obtained from a European species, A. mvntana L. 



Key to the species 

 1. Lower leaves broadly ovate, cordate; heads almost always solitary- 



1. A. CORDIFOLIA. 



1. Lower leaves oblong to lance-ovate, tapering at base; heads normally 3 or 

 more 2. A. foliosa. 



1. Arnica cordifolia Hook., Fl. Bor. Amer. 1: 331. 1834. 



North rim of the Grand Canyon (Grand Canyon Herbarium 2007). 

 Alaska to South Dakota, Xew Mexico, northern Arizona, and Cali- 

 fornia . 



2. Arnica foliosa Xutt., Amer. Phil. Soc. Trans, ser. 2, 7: 407. 1841. 



Kaibab Plateau, 9.100 feet {Cqllom in 1940). Alaska to Colorado. 

 Utah, northern Arizona, and California. 



8 Gray, Asa. miscellaneous botanical notes and characters. Amer. Acad. Arts and Pci. Proc. 8: 

 282-296. 1870. (See p. 290.) 

 1 Wheeler, Louis C. type of the genus lepidospartum. Rhodora 40: 320-323. 1938. 



