CHAP. XIX.] 



THE MADAGASCAR GROUP. 



413 



Rodriguez and one in Polynesia. Mespilodaphne, an extensive 

 genus of Lauracese, has six species in the Mascarene islands, 

 and all the rest (about fifty species) in South America. Ne- 

 penthes, the well-known pitcher plants, are found chiefly in the 

 Malay Islands, South China, and Ceylon, with species in the 

 Seychelles Islands, and in Madagascar. Milla, a large genus of 

 Lihaceae, is exclusively American, except one species found in 

 Mauritius and Bourbon. Agauria, a genus of Ericacese, is con- 

 fined to the Mascarene islands and the Camaroon Mountains 

 in West Africa. An acacia, found in Mauritius and Bourbon 

 (A, heterophylla), can hardly be separated specifically from 

 Acacia koa of the Sandwich Islands. The genus Pandanus, 

 or screw-pine, has sixteen species in the three islands — 

 Mauritius, Rodriguez, and the Seychelles — all being peculiar, 

 and none ranging beyond a single island. Of palms there are 

 fifteen species belonging to ten genera, and all these genera are 

 peculiar to the islands. We have here ample evidence that 

 plants exhibit the same anomalies of distribution in these 

 islands as do the animals, though in a smaller proportion ; while 

 they also exhibit some of the transitional stages by which these 

 anomalies have, in all probability, been brought about, render- 

 ing quite unnecessary any other changes in the distribution of 

 sea and land than physical and geological evidence warrants.^ 



^ It may be interesting to botanists and to students of geographical 

 distribution to give here an enumeration of the endemic genera of the 

 Flora of the Mauritius and the Seychelles, as they are nowhere separately 

 tabulated in that work. 



Apliloia (Bixaceae) 1 sp., a shrub, Maur., Rod., Sey., also 



Madagascar. 



Medusagyne (Ternstromiacese).. 1 sp., a shrub, Seychelles. 



Astiria (Sterculiacese) 1 sp., a shrub, Mauritius. 



Quivisia (Meliace£e) 3 sp., shrubs, Mauritius (2 sp.), Rodriguez 



(1 sp.), also Bourbon. 



Cossignya (Sapindacese) 1 sp., a shrub, Mauritius, also Bourbon. 



Hornea „ 1 sp., a shrub, Mauritius. 



Stadtmannia „ 1 sp,, a shrub, Mauritius. 



Dofatoxylon „ 1 sp., a shrub, Mauritius and Bourbon. 



Gagnebina (Leguminosse) 1 sp., a shrub, Mauritius, also Madagascar. 



Roussea (Saxifragacese) 1 sp., a climbing shrub, Mauritius and 



Bourbon. 



