GENERAL REMARKS. 15 



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



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

 Atlantic and the Pacific regions. 



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



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

 one species in the Atlantic-Mexican region. 



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



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

 which one extenciri 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. 



jVyrsine, Ardimi, Jacquinia, Chri/sophyllum, Sideroxylon, and Bipholis arc each represented by a single semi- 

 trojjical species. 



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



Mimusops is represented by one semi-tropical species. 



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



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



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



Fraxinris, 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 the Mexican region, and by three 

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



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

 reaches the Mexican-Pacific region. 



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



Cordia is represented by one arborescent and by one frutescent semi-troi)ical species and by one arborescent 

 and one frutescent species in the Atlantic Mexican region. 



Boiirreria and Ehretia are each represented by a single semi-tropical species. 



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



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

 region. 



Grescentia, Githarexylum, and Avicennia are each represented by a single semi-tropical species. 



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



Ooccohba is represented by two semi-tropical species. 



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



Nectandra is represented by one semi-tropical species. 



Sassaf'ran is represented by one widely-distributed species in the Atlantic region. 



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



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



(Jlmus, with its center of distribution in the Mis^ssippi basin, is represented in the Atlantic region by five- 

 species. 



Planera is rei)resented by a single species in the southern Atlantic region. 



Geltvi 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 the Atlantic- Mexican and the Pacific-Mexican regions. 



Ficu is represented by three semi-tropical species. 



Morus 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. 



Madura is represented by a single local s[)ecies in the southern Atlantic region. 



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

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



Juglans is represented by two widely-distributed 8[)ecies in the Atlantic region and l)y a species in the Pacific- 

 coast, extending through the 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. 



Myrica is represented by one arborescent and two frutescent species in the Atlantic region and by one 

 arborescent species in the Pacific Coast region. 



QuercuH, with its center of most important distribution in the basin of the lower Ohio nver, is represented in 

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

 the Pacilic-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. 



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



