GENERAL REMARKS. 15 



Guettarda is represented by one arborescent and by one frnte.scent semi- tropical species. 



Vacdnium is represented by one arborescent species in tlie Atlantic and by several frntescent species in the 

 Atlantic and the Pacific regions. 



Andromeda is represented by an arborescent and several frutescent species in the Atlantic region. 



ArbutiiH is represented by one species in the Pacitlo Coast, by a second species in the Pacific Mexican, and by 

 one species in the Atlantic-Mexican region. 



Oxydeiidiniii, an endemic genus of the Atlantic region, is there represented by a single, species. 



Kalmia is represented by one arborescent species and by three fruteseent species in the Atlantic region, of 

 which one extends to the Pacific region. 



Rhododendron is represented by one arborescent and by several frutescent species in the Atlantic and by 

 several frutescent species in the Pacific region. 



Myrsine, Ardiai-a, Jacquinia, Ohrysophyllum, iSidcro.rylon, and Dipholix are each represented by a single semi- 

 tropical species. 



Bumelia is represented by four species in the Atlantic and by one species in the Pacific-Mexican region. 



Mimmopti is represented by one semi-tropical species. 



Diospyrofs is represented by one species in the Atlantic and by one in the Atlantic-Mexican region. 



Synqjlocos is represented by one species in the southern Atlantic region. 



Halersia is represented by two arborescent and by one frutescent species in the southern Atlantic region. 



Frcaimis, with its center of distribution in the southern Atlantic region, is represented by seven species in 

 the Atlantic, of which one extends into the Pacific region, and one belongs to tbe Mexican region, and by three 

 arborescent and one frutescent species in the Pacific, of which one belongs to the Mexican region. 



ForcKticra is represented by one arborescent and seven frutescent species in the Atlantic region, of which one 

 reaches the Mexican-Pacific region. 



Chionanthus and Osmantlim are each represented by a single species in the southern Atlantic region. 



Cordia is represented by one arborescent and by one frutescent semi-tropical species and by one arborescent 

 and one frutescent species in the Atlantic Mexican region. 



Boitrrcria and Ehrciia are each represented by a single semi-tropical species. 



Catalpa is represented by two species in the southern Atlantic region. 



Chilopsift is represented by a single species in the Pacific-Mexican region, extending into the Atlantic-Mexican 

 region. 



Orescentia, Citharcxylum, and Ariccnnia are each represented by a single semi-tropical species. 



Pisonia is represented by one arborescent and by two frutescent semi-tropical species. 



Ooccoloba is represented by two semi-tropical species. 



Persca is represented by one species in the southern Atlantic region. 



Nectandra is represented by one semi-tropical species. 



Sassafras is represented by one widely-distributed species in the Atlantic region. 



Umbcllularia is represented by a single species in tlie Pacific Coast region. 



Drypetes, Sebastiania, and Hippomane are each represented by a single semi-tropical species. 



Ulmuit, with its center of distribution in the Mississippi basin, is represented in the Atlantic region by five 

 species. 



Planera is represented by a single species in the southern Atlantic region. 



Celtis is represented by a single polymorphous species of wide distribution in the Atlantic region, extending 

 into the Pacific region, and by a frutescent species common to tbe Atlantic- Mexican and the Pacific-Mexican regions. 



F ivus is represented by three semi-tropical gpecies. 



MOTUK is represented by one widely-distributed species in the Atlantic region, and by one species in the Atlantic- 

 Mexican, extending into the Pacific-Mexican region. 



Maclura is represented by a single local species in the southern Atlantic region. 



Platnnm is represented by one widely-distributed species in the Atlantic region, by a species in the Pacific 

 coast, and by a species in the Pacific-Mexican region. 



Juglans is represented by two widely-distributed species in the Atlantic region and by a species in the Pacific 

 coast, extending through Ihe Pacific-Mexican into the Atlantic-Mexican region. 



Garya, an endemic genus of the Atlantic region, with its center of distribution west of the Mississippi river, is 

 represented by seven species. 



Myrii-a is represented by one arborescent and two frutescent species in the Atlantic region and by one 

 arborescent species in the Pacilic Coast region. 



Qtierciui, with its center of most important distribution in the basin of the lower Ohio river, is represented in 

 the Atlantic region by twenty-four arborescent species, of which one, belonging to the Mexican region, extends into 

 the Pacific-Mexican region ; and in the Pacific region by twelve arborescent species, of which one belongs to the 

 interior and four to the Mexican region, and by two frutescent species. 



Caslanopsis is represented by a single species in the Pacific Coast region. 



