FLOWERING PLANTS AND FERXS OF ARIZONA 1017 



1. Centaurea solstitialis L., Sp. PL 917. 1753. 



Waste places, Yuma {Stitt 1248), apparently rare in Arizona, 

 summer. An occasional weed in much of the United States, natural- 

 ized in California; native of Europe. 



2. Centaurea melitensis L., Sp. PL 917. 1753. 



Apache, Yavapai, Maricopa, Pinal, Cochise, and Pima Counties, 

 waste ground and open, rocky slopes, May and June. Occasional 

 weed in much of the United States, abundant in the West; native of 

 Europe. 



3. Centaurea picris Pall., "Tabl. Taur. 58"; WilkL, Sp. PL 3: 2302. 



1804. 



? Centaurea repens L., Sp. PL ed. 2, 1293. 1763. 



Joseph City (Navajo County), in waste places, apparently rare in 

 Arizona, summer. Occasional or naturalized from Michigan and 

 Missouri to Washington, Oregon, and California; native of eastern 

 Europe and Asia. 



Often a pernicious weed. 



4. Centaurea americana Xutt., Acad. Xat. Sci. Phila. Join*. 2: 117. 



1821. 



White Mountains {Griffiths 5398), Fort Apache, Navajo County 

 {Hough), apparently rare in Arizona, July and August. Missouri and 

 Louisiana to Kansas, eastern Arizona, and northern Mexico. 



A very ornamental plant, sometimes cultivated under the name 

 American basketflower. 



5. Centaurea rothrockii Greenm., Bot. Gaz. 37: 221. 1904. 

 Chiricah.ua and Huachuca Mountains (Cochise Count}'), 6,000 to 



8,000 feet, along streams, September and October, type probably from 

 the Chiricahua Mountains (Roth rock 527). Southwestern New Mexico 

 and southeastern Arizona to Oaxaca. 



Very similar to C. americana and equally handsome. 



121. CHAPTALIA 



Scapose perennial; leaves pinnatifid or sinuate, glabra te and green 

 above, thinly white-tomentose beneath; scapes several, up to 0.5 m. 

 high, 1-headed; head 2 to 2.5 cm. high; involucre strongly graduate; 

 outer flowers pistillate, with a strap-shaped 3-toothed purplish corolla, 

 the disk flowers hermaphrodite, whitish, more or less bilabiate; 

 achenes fusiform, beaked; pappus of copious capillary whitish or 

 brownish bristles. 



1. Chaptalia alsophila Greene, Leaflets 1 ; 158. 1905. 



Chaptalia conjinis Greene, ibid. 



Chaptalia son cli if olia Greene; Leaflets 1; 191. 1906. 



Chiricahua and Huachuca Mountains (Cochise County). Rincon 

 Mountains (Pima County), about 8.000 feet, coniferous forests, rare. 

 May to October, the type of C. conjinis from the Huachuca Mountains 

 {Lemmon 2789), the type of C. sonchifolia from the Rincon Mountains 

 {Xeedley 223). Southwestern New Mexico and southeastern Arizona. 



Specimens from the White Mountains, Apache County (Kearney 

 and Peebles 12431), and from Long Valley, Coconino County {Peebles 



