STANDKEY TKEES AND SHRUBS OF MEXICO. 1271 



Flowers less than 1.5 cm. long. 



Leaves linear; calyx villous-hirsute 3. P. incana. 



Leaves oblong to suborbicular ; calyx tomentulose. 



Leaves glabrate, the pubescence simple 4. P. glabrescens. 



Leaves densely stellate-tomentose. 



Leaves orbicular-ovate ; corolla tube short-exserted 5. P. marif olia. 



Leaves oblong-ovate; corolla tube long-exserted 6. P. mollis. 



1. Poliomintha longiflora A. Gray, Proc. Amer. Acad. 8: 296. 1870. 

 Coahuila. 



Shrub, about 30 cm. high ; leaves 5 to 10 mm. long, rounded or obtuse at 

 apex, canescent-tomentulose beneath w^ith simple hairs, green above; corolla 

 2.5 to 3.5 cm. long, red. " Or§gano." 



The leaves are used for flavoring food and for making a beverage like tea. 



2. Poliomintha bicolor S. Wats. Proc. Amer. Acad. 25: 160. 1890. 

 Hedeoma bicolor Briq. Ann. Cons. Jard. Bot. Geneve 2: 185. 1898. 

 Type from Sierra de la Silla, Nuevo Le6n, altitude 1,500 meters. 

 Densely branched shrub, 30 cm. high or less ; leaves 4 to 8 mm. long, obtuse, 



densely white-tomentulose beneath vs^ith simple hairs, glabrous above; corolla 

 about 3 cm. long. 



3. Poliomintlia incana (Torr.) A. Gray, Proc. Amer. Acad. 8: 296. 1870. 

 Hedeoma incana Torr, U. S. & Mex. Bound. Bot. 130. 1859. 



Chihuahua and Sonora. Western Texas to Arizona and Utah. 



Shrub, 1 meter high or less; leaves 1 to 3 cm. long, densely whitish-tomentu- 

 lose vpith simple hairs; corolla 10 to 12 mm. long, pale purplish. 



The Hopi Indians of Arizona boil and eat the leaves and use the flowers for 

 seasoning food. 



4. Poliomintha glabrescens A. Gray; Hemsl. Biol. Centr. Amer. Bot. 2: 549. 



1882. 

 Type from Soledad, southwest of Monclova, Coahuila. Western Texas. 

 Low glabrate shrub; leaves oblong, 7 to 18 mm. long, obtuse, conspicuously 

 punctate; corolla about 12 mm. long. 



5. Poliomintlia marif olia (Schauer) A. Gray, Proc. Amer. Acad. 8: 365. 



1870. 

 Keithia marif olia Schauer, Linnaea 20: 705. 1847. 

 San Luis PotosI and Hidalgo; type from ZimapS-n, Hidalgo. 

 Leaves petiolate, 5 to 15 mm. long, rounded or very obtuse at apex, white- 

 tomentulose ; corolla 12 to 14 mm. long. 



6. Poliomintha mollis (Torr.) A. Gray, Proc. Amer. Acad. 8: 365. 1870. 

 Hedeoma mollis Torr. U. S. & Mex. Bound. Bot. 129. 1859. 



Western Texas ; type collected along the Rio Grande at Puerto de Paisano ; 

 doubtless extending into Mexico. 

 Leaves 1 to 2.5 cm. long, obtuse or acutish, petiolate; corolla 12 mm. long. 



6. SAXAZARIA Torr. U. S. & Mex. Bound. Bot. 133. 1859. 



The genus was named for Don Jos6 Salazar, Mexican Commissioner of the 

 United States and Mexican Boundary Survey. It consists of a single species. 



1. Salazaria mexicana Torr. U. S. & Mex. Bound. Bot. 133. pi. 39. 1859. 



Baja California, Chihuahua, and Coahuila ; type collected in Chihuahua 

 below Presidio del Norte. Utah to southern California. 



