FLOWERING PLANTS AXD FERNS OF ARIZONA 961 



70. VERBESIXA. 86 Cbowkbeabd 



Annual or perennial herbs; leaves opposite or alternate, linear to 

 ovate, usually toothed; heads medium-sized or rather large, radiate, 

 yellow; rays pistillate or rarely neutral; achenes strongly compressed, 

 2-winged; pappus none or of 1 or 2 awns. 



Key to the species 



I. Leaves linear or linear-lanceolate, long-acuminate, sessile, 9 to 23 cm. long, 

 5 to 18 mm. wide, subentire or slightly serrate, strongly veiny beneath; 

 achenes narrowly winged; pappus awns wanting or rudimentary. 



1. V. LOXGIFOLIA. 



1. Leaves lanceolate to ovate or deltoid, obtuse to acuminate, much broader in 

 proportion to their length, usually sharply toothed, seldom veiny; achenes 

 broadly winged (2). 

 2. Leaves sessile, auriculate-clasping, green on both sides; perennial, with 

 usually simple stems, and solitary heads on long naked peduncles. 



2. V. ROTHROCKII. 



2. Leaves petioled, densely white-strigose beneath, green or greenish above; 

 annual, often much-branched, and with numerous heads. 



3. V. EXCELIOIDES. 



1. Verbesina longifolia A. Grav, Amer. Acad. Arts and Sci. Proc. 19: 



12. 1883. 



Actinomeris longifolia A. Gray, PI. Wright. 2: 89. 1853. 



Mountains of Cochise, Santa Cruz, and Pima Counties, 5,000 to 

 8.000 feet, July to October. Southwestern Xew Mexico, southeastern 

 Arizona, and northern Mexico. 



2. Verbesina rothrockii Robins, and Greenm.. Amer. Acad. Arts and 



Sci. Proc, 34: 541. 1899. 

 Cochise, Santa Cruz, and Pima Counties, 3.500 to 5.600 feet, rocky 

 slopes. May to September. Southern New Mexico, southern Arizona, 

 and Coahuila. 



3. Verbesina encelioides (Cav.) Benth. and Hook, ex A. Grav, Bot. 



Calif. 1: 350. 1876. 



Ximenesia encelioides Cav., Icon. PI. 2: 60. 1793. 



Apache County to Mohave County, south to Cochise and Puna 

 Counties, up to 7,200 feet but usually much lower, a common weed of 

 roadsides and waste ground, April to November. Kansas to Montana, 

 south to Texas, California, and northern Mexico. 



The commoner form in Arizona is var. exauriculata Robins, and 

 Greenm. (V. emurieulata Cockerell, Ximenesia exauricvlata Rydb.), 

 distinguished from the typical form by having the petioles not atiri- 

 culate-dilated at base. This plant is said to have been used by In- 

 dians and white pioneers for boils and skin diseases. The Hopis are 

 reported to bathe in water in which this plant has been soaked, to 

 relieve the pain of spider bite. 



71. COREOPSIS. 87 Tickseed 



Annual herbs; leaves mostly opposite, pinna tisect or dissected; 

 beads medium-sized or rather large, showy, the rays yellow or with a 



** Reference: Robinson. B. L., and Greenman, J. M. synopsis <>f the gbnus verbesina. with an 

 analytical key to the species. Amer. Acad. Arts and Sci. Proc. 34 I Gray Herbarium 

 Contrib. 16): 534-566. 1899. 



'' Reference: Sherff, E. E. revision of the genus coreopsis. Field Mus. Xat. Hist. Bot. Ser. 11: 

 279-475. 1936. 



