760 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. Gaya occidentalis (L.) H. B. K. Nov. Gen. & Sp. 5: 208. 1821. 

 Sida occidentalis L. Amoen. Acad. 4: 325. 1759. 

 Tamaulipas and Veracruz. Cuba and Hispaniola. 



Plants suffrutescent, about a meter high ; leaves oblong to ovate, 1.5 to 6 

 cm. long, obtuse or acute, serrulate, densely stellate-tomentose ; petals yellow, 

 1.5 to 2 cm. long. 



2. Gaya violacea Rose, Contr. U. S. Nat. Herb. 12: 286. 1909. 



Known only from the type locality, Sierra Madre near Monterrey, Nuevo 

 Leon. 



Shrub, 2 meters high or less; leaves ovate or lance-ovate, 6 to 9 cm. long, 

 long-acuminate, coarsely crenate, green above, pale beneath and minutely 

 stellate-pubescent ; petals 8 mm. long ; carpels 8 or 9. 



3. Gaya minutiflora Rose, Contr. U. S. Nat. Herb. 1 : 305. 1895. 

 Colima to Oaxaca and Morelos ; type from Colima. 



Slender shrub or herb ; leaves ovate or ovate-oblong, 2 to 6.5 cm. long, 

 acuminate, finely or coarsely crenate-dentate, thinly stellate-pubescent ; carpels 

 9 or 10. 



4. Gaya calyptrata (Cav.) H. B. K. Nov. Gen. & Sp. 5: 208. 1821. 

 Sida calyptrata Cav. Monad. Diss. 57. 1780. 



Sida disticha Cav. Icon. PI. 5: 12. pi. 57. 1799. 



Gaya hcrmannioides H. B. K. Nov. Gen. & Sp. 5 : 209. pi. 1,15. 1821. 



Sida gaya DC. Prodr. 1 : 466. 1824. 



Gaya disticha Presl, Rel Haenk 2 : 113, 1836. 



"Veracruz, Puebla, and Chiapas. Central America and South America. 



Slender shrub or herb ; leaves ovate to lance-oblong, 2 to 4 cm. long, obtuse 

 to acuminate, finely or coarsely serrate, sparsely or densely stellate-pubescent ; 

 carpels 10 to 14. 



9. BOBINSONELLA Rose & Baker, Gard. & For. 10: 244. 1897. 



Shrubs or trees ; leaves petiolate, entire, dentate, or lobate ; flowers chiefly 

 axillary, usually fasciculate, large and showy, ebracteolate ; carpels membrana- 

 ceous, inflated at maturity. 



Leaves deeply 3 or 5-lobate 1. R. lindeniana. 



Leaves obscurely or not at all lobate. 



Leaves covered beneath with a minute appressed pale silvery tomentum. 



2. R. discolor. 

 Leaves loosely stellate-pubescent beneath, pilose along the nerves. 



3. R. cordata. 



1. Robinsonella lindeniana (Turcz.) Rose & Baker, Gard. & For. 10: 245. 1897. 

 Sida lindeniana Turcz. Bull. Soc. Nat. Moscou 31': 200. 1838. 



Sida ghisbreghtiana Turcz. Bull. Soc. Nat. Moscou 31': 200. 1838. 



AMtilon ambiguum Turcz. Bull. Soc. Nat. Moscou 31': 205. 1838. 



Veracruz ; type from Mirador. 



Shrub, 2.5 to 3 meters high or larger ; leaves 7 to 25 cm. wide, the lobes 

 acute or acuminate, entire or dentate, green above, coarsely stellate-tomentose 

 beneath; petals white, 7 to 8 mm. long; carpels 7 to 8 mm. long, not beaked, 

 stellate-pubescent. 



2. Robinsonella discolor Rose & Baker, Contr. U. S. Nat. Herb. 5: 181. 1899. 

 Known only from the type locality. Las Palmas, San Luis PotosI, altitude 90 



to 120 meters. 



