FLOWERING PLANTS AND FERNS OF ARIZONA 739 



August to September. Colorado. New Mexico, Arizona, and Mexico; 

 South America. 



5. Xama hispidum A. Gray, Amer. Acad. Arts and Sci. Proc. 5: 339. 

 1861. 



Almost throughout the State. 5.000 feet or lower, dry plains and 

 mesas, usually in sandy soil. February to June (sometimes autumn). 

 Oklahoma and Colorado to Arizona, southeastern California, and 

 northern Mexico. 



The form common in Arizona is var. spathvlatum (Torr.) C. L. 

 Hitchc. A collection at Yuma of var. revolutum Jepson {Beard in 

 1911) is cited by Hitchcock. This variety is characterized by the 

 presence of soft-hirsute as well as hispid pubescence, and by the 

 strongly revolute leaves. The var. mentzelii Brand (Marilaunidium 

 foliosum Woot. and Standi.) was collected in the Gila River bed near 

 Sacaton. Pinal County (Harrison and Kearney 8814), where it doubt- 

 less grew from seeds brought down the river from farther east. This 

 variety has more stiffly hispid herbage than the other forms, and the 

 pubescence of the lower leaf surface is glandular. 



7. TRICARDIA 



Plants perennial; stems branched from the base; leaves mostly 

 basal or nearly so. the blades spatulate; flowers in short racemes, the 

 corolla with 10 narrow internal appendages, broadly campanulate. 

 white and purple: stamens unequal. 



1. Tricardia watsoni Torr. ex S. Wats, in Kins:. Geol. Expl. 40th 

 Par. 5: 258. 1871. 

 Beaver Dam, northwestern Mohave County. 1,800 feet (Jones 

 5024 ai), April. Southern Utah and northwestern Arizona, to south- 

 eastern California. 



8. ERIODICTYON. Yerba-saxta 



Shrub up to about 1.2 m. (4 feet) high; leaf blades lanceolate, den- 

 tate or denticulate, dark green and resinous above, white-tomentose 

 beneath; flowers numerous in scorpioid, often subcapitate, cymes. 

 these forming terminal panicles; corolla broadly funnelform, deeply 

 lobed, lilac or whitish; styles 2, or 1- and 2-parted; capsules 4-valved. 



Sometimes known as mountain-balm. An infusion of the aromatic 

 leaves is used locally in treating respiratory ailments, and is con- 

 sidered by "old timers''' to be very efficacious for sore throat and 

 coughs (Collom ins.). 



1. Eriodictvon angustifolium Nutt., Acad. Nat. Sci. Phila. Jour. ser. 

 2, 1: 181. 1848. 



Southern Coconino and Mohave Counties to Greenlee. Pinal, and 

 Pima Counties, 3,500 to 6.000 feet, dry slopes, common in chaparral, 

 May to August. Southern Utah, southern Nevada, and Arizona. 



A large-leaved form collected in the Pinal Mountains, Gila County 

 (Jones in 1890) is the type of var. amplifolium Brand. 



