FLOWERING PLANTS AND FERNS OF ARIZONA 681 



3. Frasera albomarginata S. Wats, in King, Geol. Expl. 40th Par. 5: 

 280. 1871. 

 Navajo County to Mohave County, on both sides of the Grand 

 Canyon, 4.800 to 5,700 feet, June and July. Southern Utah and 

 northern Arizona to southeastern California. 



4. SWERTIA 



A perennial herb, very similar to Frasera except in the characters 

 given in the key to the genera. 



Frasera is combined with Swertia by some authorities. 



1. Swertia perennis L., Sp. PL 226. 1753. 



Swertia scopulina Greene, Pittonia 4: 184. 1900. 



"White Mountains, Apache Countv {Ellis 17 in part, Peebles and 

 Smith 12501), about 10,000 feet, August, Montana to New Mexico 

 and eastern Arizona; Eurasia. 



Corolla deep slate blue, white-veined beneath. 



5. HALENIA 



Small annual herb; stems erect, leafy, usually simple; flowers in 

 panicles of cymes; corolla light yellow, without glands, folds, or fringe, 

 the lobes erect, usually extended at base into nectariferous spurs; 

 stigmas 2, sessile, persistent; capsule somewhat flattened. 



1. Halenia recurva (Smith) Allen, Mo. Bot. Gard. Ann. 20: 161. 

 1933. 



Swertia recurva Smith, Rees's Cycl. 34: 9. 1819. 



Halenia rothrockii A. Gray, Amer. Acad. Arts and Sci. Proc. 



11: 84. 1876. 



White Mountains (northern Greenlee County) and Mogollon Es- 

 carpment (southern Coconino County) to the Chiricahua Mountains 

 (Cochise Count}'), 7,500 to 10,000 feet, rich moist soil in coniferous 

 forests, August and September, type of H. rothrockii from Mount 

 Graham (Roihrock 733). Arizona and northern Mexico. 



6. EUSTOMA 



Plant perennial, glaucous; stems leafy, erect or nearly so, up to 0.7 

 m. (2.5 feet) high; leaves oblong, oblong-lanceolate, or slightly 

 oblanceolate; calyx lobes keeled, long-acuminate; corolla deeply 

 campanulate, violet, the lobes 2 to 3 cm. long, about twice as long as 

 the tube; capsule ellipsoid, very obtuse, 2-valved. 



1. Eustoma exaltatum (L.) Griseb. in DC, Prodr. 9: 51. 1S45. 



Gentiana exaltata L., Sp. PI. ed. 2, 331. 1762. 



Eustoma silenijolium Salisb., Parad. London, pi. 34. 1805. 



Gila, Maricopa, and Pima Counties, 1,000 to about 2,500 feet, 

 along ditches and in beds of streams, June to September. Florida, 

 southern Arizona, southern California, and Mexico. 



Catchny-gentian, a very showy plant, rare in Arizona. 



