FLOWERING PLANTS AND FERNS OF ARIZONA 1015 



10. Cirsium grahami A. Gray, PL Wright. 2: 102. 1853. 

 McNary, Apache County, 7,400 feet (Peebles and Smith 1247" . 



Huachuca Mountains, Cochise County (Lemmon 2791, Mearns 2560), 

 August to October. Southwestern New Mexico, eastern Arizona, 

 and Sonora. 



Flowers deep purple. 



11. Cirsium ochrocentrum A. Gray, Amer. Acad. Arts and Sci. Mem. 



ser. 2, 4: 110. 1849. 



Navajo and Coconino Counties, south to Cochise, Santa Cruz, and 

 Pima Counties, 4,500 to 8,000 feet, open land and in the pinyon- 

 juniper association, often abundant, May to October. Nebraska to 

 Texas and Arizona. 



Flowers cream-colored or rose-colored to deep carmine or purple. 

 Arizona specimens that have been identified as C. megacephalum 

 (A. Gray) Cockerell are included here. 



12. Cirsium wheeleri (A. Gray) Petrak, Bot. Tidsskr. 31: 67. 1911. 



Cnicus wheeleri A. Gray, Amer. Acad. Arts and Sci. Proc. 19: 



56. 1883. 

 Carduus perennans Greene, Torrey Bot. Club Bui. 25 : 123. 



1898. 

 Cirsium perennans Woot. and Standi., Contrib. U. S. Natl. 



Herbarium 19: 753. 1915. 

 Cirsium blumeri Petrak, Bot. Centbl. Beihefte 35 2 : 504. 



1917. 



Apache, Coconino, Yavapai, Graham, Gila, Cochise, and Pima 

 Counties, 5,000 to 9,000 feet, mostly in open pine forest, common, 

 June to October, type of C. wheeleri from near Fort Apache (Rothrock 

 293), type of C. blumeri from Spud Ranch, Rincon Mountains (Blumer 

 in 1910). Southern New Mexico and Arizona. 



Flowers purple or lavender. 



13. Cirsium undulatum (Nutt.) Spreng., Syst. Veg. 3: 374. 1826. 



Carduus undulatus Nutt., Gen. PL 2: 130. 1818. 



Huachuca Mountains (Peebles et al., 3418), October. Michigan to 

 British Columbia, south to Texas and Arizona, where apparently it is 

 rare. 



Carduus nutans L., musk-thistle, was collected in 1939 at a roadside about 8 

 miles south of Greasewood Trading Post, Apache County (Goodman and Payson 

 3174). The material was received too late to permit inserting the genus in the 

 key. The plant is distinguished from Cirsium, which it closely resembles in 

 appearance, by having essentially smooth (not plumose) pappus bristles, and from 

 Silybum, to which it might run in the key, by having the leaves without white 

 markings and the coriaceous-herbaceous appendages of the phyllaries spine-tipped 

 but not spinulose-margined. 



118. CYNARA. Artichoke, globe- artichoke 



Coarse perennial, whitish -woolly, especially on the lower leaf 

 surface; leaves very large, deeply pinnatisect, with mostly lanceolate, 

 entire or few-toothed, scarcely spiny lobes; heads large (about (> to 

 10 cm. thick or more), the phyllaries many-seriate, coriaceous, ovate 

 to oblong, not spiny, glabrous, the inner ones often purplish ; receptacle 

 densely setose; corollas purple; pappus of numerous, several-seriate, 

 very narrow, plumose paleae, deciduous in a ring. 



