800 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves pubescent beneath in age ; flowers in small dense clusters. 

 Calyx 4 to 4.5 mm, long; leaves green beneath, thinly stellate-pubes- 

 cent 6. W. pringlei. 



Calyx 6 mm. long; leaves whitish beneath, densely stellate-tomentu- 



lose 7. W. conzattii. 



Lobes of the calyx nearly or quite as long as the tube. 



Filaments united to form a tube 8. W. americana. 



Filaments free above. 



Leaves acute; petals purple 9. W. hirsuta. 



Leaves obtuse or rounded at apex; petals yellow 10. W. acapulcensis. 



1. Waltheria acuminata Rose, Contr. U. S. Nat. Herb. 5: 183. 1899. 

 Known only from the type locality, Culiacfi,n, Sinaloa. 



Slender shrub ; leaves ovate-cordate, thin, green, 8 to 12 cm, long, shal- 

 lowly cordate at base, long-petiolate ; flower clusters short-pedunculate; calyx 

 lobes half as long as the tube ; filaments united to above the middle. 



2. Waltheria brevipes Turcz. Bull. Soc. Nat. Moscou 31': 213. 1858. 

 Veracruz and Oaxaca ; type from San Pedro Nolasco, Oaxaca. Costa Rica. 

 Shrub or small tree, 2.5 to 7.5 meters high; leaves short-petiolate, acute 



or obtuse, subcordate at base, rugose, finely stellate-tomentulose, pale be- 

 neath ; flower clusters large, dense, mostly sessile ; calyx 6 to 7 mm, longi, 

 the lobes half as long as the tube. 



3. Waltheria glomerata Presl, Rel. Haenk. 2: 152. 1836. 

 Veracruz. Panama (type locality). 



Shrub, 1.5 to 3 meters high; leaves short-petiolate, acute, obtuse or rounded 

 at base, rugose, finely stellate-pubescent, pale beneath, at least when young, 

 finely dentate ; flower clusters large, sessile ; calyx 6 ram. long, the lobes short ; 

 petals white, exserted. 



The leaves are said to be used in Panama as a hemostatic. 



4. Waltheria preslii Walp. Repert. Bot. 1 : 340. 1842. 



Waltheria rotundifolia Presl, Rel, Haeuk. 2: 151. 1836. Not W. rotundifolia 

 Schrank, 1828. 



Known only from the vicinity of Acapulco, Guerrero, the type locality. 



Stems suflfrutescent, usually prostrate ; leaves broadly ovate or rounded, 

 long-petiolate, obtuse or rounded at apex, cordate at base, densely stellate- 

 tomentose; flower clusters mostly pedunculate; calyx 4 to 5 mm. long; 

 petals yellow. 



5. Waltheria alamosana Standi., sp. nov. 



Type from Alamos, Sonora (Rose, Standley & Russell 12714; U. S. Nat. 

 Herb. no. 635525). 



Shrub, 1 to 1.5 meters high, the branches dark reddish brown, very minutely 

 and sparsely stellate-pubescent or glabrate; leaves ovate, 3 to 6 cm. long, long- 

 petiolate, obtuse to acuminate, cordate or subcordate at base, coarsely crenate, 

 when young mimitely stellate-pubescent but soon becoming glabrous; flowers 

 loosely cymose-paniculate, sessile; calyx cylindric, 6 mm. long, 5-angulate, cos- 

 tate between the angles, minutely stellate-pubescent, the lobes half as long as 

 the tube, narrowly triangular, acuminate. 



6. Waltheria pringlei Rose & Standi., sp. nov, 



Guerrero and Morelos ; type from limestone mountains above Iguala, Guerrero, 

 altitude 1,200 meters (Pringle 8422; U. S. Nat. Herb. no. 381847). 



Shrub, 1 to 2.5 meters high ; leaves short-petiolate, lance-ovate or ovate, 3.5 

 to 7 cm. long, acute, rounded or subcordate at base, coarsely and obtusely den- 



