Britton: Studies of West Indian plants XII 9 



6. Dorstenia tubucina R. & P. Fl. Per. 1: 65 



Arima Savanna, Trinidad, collected by Purdie, according to 

 Grisebach. 



7. Dorstenia petraea Griseb. ("at. PI. Cub. 58. 1866 

 Mountains of southern Oriente, Cuba. 



8. Dorstenia peltata Spreng. Neue Entd. 3: 22. 1822 

 Santo Domingo, near Samana Bay. 



9. Dorstenia crassipes C. Wright; Griseb. Cat. PI. Cub. 



58. 1866 



Near La Catalina, Oriente, Cuba (Wright 2224). 



10. Dorstenia erythrandra C. Wright ; Griseb. Cat. PI. Cub. 



58. 1866 



Rocks by the sea, Baracoa, Oriente, Cuba (Wright 2225). 



11. Dorstenia Roigii Britton, sp. nov. 



Rootstock stout, 8-10 cm. long, 5-6 mm. thick. Petiole> 

 rather stout, densely puberulent, 15 cm. long or less; leaf-blades 

 ovate, peltate below the middle, chartaceous when dry, coarsely 

 undulate-dentate all around, strongly veined, 6-8 cm. long, 

 dark green and scabrous above, paler and densely puberulent 

 beneath, the apex obtuse or acute, the base rounded; peduncle 

 puberulent, 5-7 cm. long; receptacle orbicular, nearly Hat, 

 peltate, about 10 mm. in diameter. 



On rocks at the foot of Mogote de la Jagua, Consolacion del 

 Norte, Pinar del Rio, Cuba, June 17, 1923 (Roig 254J). 



12. Dorstenia confusa Britton, sp. nov. 



Rootstock slender, tuberiferous. Petioles slender, tomentu- 

 lose, 4-6 cm. long; leaf-blades broadly ovate, membranous, 

 2.5-3 cm. long, peltate somewhat below the middle, finely pubes- 

 cent beneath, especially on the veins, repand-crenate, the apex 

 blunt, the base rounded; peduncle tomentulose, about 4 cm. 

 long; receptacle orbicular, nearly discoid, 6 mm. in diameter, 

 tomentulose, ciliate. 



Monte Verde, Oriente, Cuba (Wright 2220, in Gray Herb- 

 arium). 



