FLOWER IXG PLANTS AXD FERNS OF ARIZONA 895 



Some of the species (including G. squarrosa) are official drug plants, 

 being antispasmodic and stomachic, administered in asthma, and 

 externally to relieve the irritation caused by poison-ivy. The plants 

 are suspected of being toxic to livestock but are rarely eaten. 



Key to the species 



1. Heads discoid 1. G. aphaxactis. 



1. Heads radiate (2). 



2. Phyllaries with strongly spreading or recurved subulate tips. 



2. G. squarrosa. 

 2. Phyllaries with appressed or nearly erect triangular tips (3). 



3. Leaves all or mostly laciniate-dentate or pinnatifid 3. G. lacixiata. 



3. Leaves merely serrulate 4. G. arizoxica. 



1. Grindelia aphanaetis Rydb., Torr. Bot. Club Bui. 31: 047. 1904. 



Grindelia pinnatifida YVoot. and Standi., Contrib. U. S. Natl. 



Herbarium 16: 17S. 1913. 



Apache, Navajo, Coconino, and Yavapai Counties, and in the Chiri- 

 cahua Mountains (Cochise County), mostly 5.000 to 7,000 feet, 

 June to September. Southeastern Utah and southern Colorado to 

 western Texas, New Mexico, and eastern Arizona. 



2. Grindelia squarrosa (Pursh) Dunal, Paris Mus. Hist. Nat. Mem. 5: 



50. 1819. 



Donia squarrosa Pursh, Fl. Amer. Sept. 559. 1814. 



Represented in Arizona by var. serrulata (Rydb.) Steyermark. 

 Tuba. Coconino County, about 5,000 feet (Cottam 2590"). Wyoming 

 to northwestern Xew Mexico and northeastern Arizona, also widely 

 introduced east and west of this range. 



3. Grindelia laciniata Rydb., Fl. Rocky Mount. S4S. 1917. 

 Southwestern Coconino and northwestern Yavapai Counties, at 



Williams and Seligman, 5,200 to 6.700 feet, June to August. South- 

 eastern Utah and northern Arizona. 



4. Grindelia arizonica A. Gray, Amer. Acad. Arts and Sci. Proc. 17: 



208. 1882. 



Apache, Navajo, and Gila Counties. 3.500 to 7.500 feet, openings 

 in pine forests. August to October. Southwestern Xew Mexico and 

 eastern Arizona. 



The var. microphylla Steyermark. with longer pappus awns (5 to 

 6.5 nun. long), is known only from north of Clifton. Greenlee County 

 (Davidson 736, type). 



11. VANCLEVEA 



Slender branching shrub, white-barked, glabrous, glutinous; leaves 

 alternate, linear-lanceolate, 3- to 5-nerved, entire or slightly toothed, 

 often conduplicate, falcate-recurved; heads medium-sized, discoid. 

 yellow, solitary or cymose; involucre graduated; achenes slender, 

 about 5-ribbed; pappus of about 12 to 16 linear acuminate persistent 

 awns. 



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