STANDLEY TKEES AND SHRUBS OF MEXICO. 1089 



4. Clethra pringlei S. Wats. Proc. Amer. Acad. 25: 157. 1890. 

 San Luis Potosf ; type from Tamasopo Canyon. 



Tree, 9 to 15 meters high, the trunk 30 to 45 cm. in diameter; leaves 

 obovate or oblong, 4 to 11 cm. long, acute or acuminate, entire, glabrous above ; 

 racemes lax, 10 to 25 cm. long; petals short-fimbriate ; capsule tomentulose, 



3 to 4 mm. broad. 



5. Clethra macrophylla Mart. & Gal. Bull. Acad. Brux. 9^: 539. 1842. 

 Veracruz; type material collected near Totutla and Mirador. 



Small tree, the branchlets closely brownish-tomentulose ; leaves obovate or 

 oblong-elliptic, 12 to 20 cm. long, acute or subacuminate, green and glabrate 

 above; racemes 10 to 15 cm. long, lax; pedicels 2 to 4 mm. long. 



6. Clethra rosei Britton, N. Amer. Fl. 29: 6. 1914. 



Known only from tlie type locality, near Colomas, Sinaloa. 



Branchlets brown-tomentose ; leaves oblong, 6 to 11 cm. long, acute or obtuse, 

 pubescent above, densely tomentose beneath ; racemes 10 to 12 cm. long, the 

 pedicels 3 to 5 mm. long; capsule 3 mm. broad. 



7. Clethra hartwegi Britton, N. Amer. FI. 29: 6. 1914. 

 Known only from the type locality, Bolanos, Jalisco. 



Branchlets tomentose: leaves 10 to 12 cm. long, obtuse or acutish, entire 

 or undulate, dentate, pubescent above or glabrate, tomentose beneath ; racemes 

 8 to 12 cm. long. 



8. Clethra lanata Mart. & Gal. Bull. Acad. Brux. 9^: 538. 1842. 

 Koivalewskia integerrima Turcz. Bull. Soc. Nat. Moscou 32': 264. 1859. 

 Clethra kowalewskii Turcz. Bull. Soc. Nat. Moscou 36': 233. 1863. 

 Clethra galeottiana Briq. Ann. Cons. Jard. Gen&ve 20: 371. 1919. 

 Clethra confusa Briq. Ann. Cons. Jard. Geneve 20: 372. 1919. 



Clethra guadalajarensis Briq. Ann. Cons. Jard. Geneve 20: 373. 1919. 



Sinaloa and Jalisco to Veracruz and Oaxaca ; type from Oaxaca. Central 

 America. 



Tree, 6 to 12 meters high, the branchlets brown-tomentose; leaves 6 to 15 

 cm. long, rounded to subacute at apex, usually cuneate at base, thick, entire 

 or sparsely dentate, glabrate above ; racemes 8 to 20 cm. long, dense ; capsule 



4 mm. broad. " Mameyito negro" (Oaxaca, Reko) ; "mama raalhuaztili " 

 (Altamirano d Ramirez) ; "nance" (Costa Rica) ; " tepezapote," " terciopelo," 

 " zapotillo de montana " (El Salvador). 



128. PYEOLACEAE. Pyrola Family. 

 Reference: Rydb. N. Amer. Fl. 29: 21-32. 1914. 

 Several species of Pyrola occur in Mexico. 



1. CHIMAPHILA Pursh, Fl. Amer. Sept. 279. 1814. 



Plants low, suffrutescent, with creeping I'ootstocks ; leaves opposite or sub- 

 verticillate, leathery, per.sistent. serrate; flowers perfect, in few-flowered termi- 

 nal umbels or racemes ; sepals 5 ; petals 5 ; stamens 10, the anthers opening 

 by terminal tubes ; style nearly obsolete, the stigma peltate, 5-radiate : fruit a 

 5-celled capsule. 



Dilated portion of the filament glabrous or eiliolate; leaves mostly oblanceo- 

 late, green, not mottled 1, C. umbellata. 



Dilated portion of the filament villous : leaves lanceolate or ovate, mottled 

 with light and dark green : 2. C. maculata. 



