CHAP. XIX 



THE MADAGASCAR GROUP 



443 



and in Madagascar. Milla, a large genus of Liliacese, is 

 exclusively American, except one species found in Mauri- 

 tius and Bourbon. Agauria, a genus of Ericaceae, is 

 found in Madagascar, the Mascarene islands, the plateau 

 of Central Africa, 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 sj^ecies belonging to ten genera, 

 and all these genera are peculiar to the islands. We have 

 here ample evidence that plants exhibit the same anom- 

 alies 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, rendering 

 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 tabidated 

 in that work. 



Aphloia (Bixacese) 1 sp., a shrub, Maur., Rod., Sey., also Madagascar. 



Medusagyne (Ternstromiacea',) ...1 sp., a shrub, Seychelles. 

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



Quivisia (Meliacese) 3 sp., shrubs, Mauritius (2 sp.), Rodriguez (1 sp.), 



also Bourbon. 



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



Hornea ,, 1 sp., a shrub, Mauritius. 



Stadtmannia ,, 1 sp., a shrub, Mauritius. 



Doratoxylon ,, 1 sp., a slirub, Mauritius and Bourbon. 



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



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



Tetrataxis (LythracejE) 1 sp., a shrub, Mauritius. 



Psiloxylon ,, 1 sp., a shrub, Mauritius and Bourbon. 



Mathurina (Turneraceje) 1 sp., a shrub, Rodriguez. 



Foetidia (Myi'taceaj) 1 sp., a tree, Mauritius. 



Danais (RubiaccEe) 4 sp., climbing shrubs, Maur. (1 sp.), Rodr. (1 sp.), 



also Bourbon and Madagascar. 



Fernelia (Rubiaceai) 1 sp., a shrub, Mauritius and Rodriguez. 



Pja-ostria ,, 6 sp., shrubs, Mauritius (3 sp.), also Bourbon and 



Madagascar. 



Scyphochlamys (Rubiacea>.) 1 sp., a shrub, Rodriguez. 



Myonima ,, 3 sp., shrubs, Mauritius, also Bourbon. 



Cylindrocline (Composite) 1 sp., a shrub, Mauritius. 



Monarrhenus 2 sp., shrubs, Mauritius, also Bourbon and Mada- 

 gascar. 



G G 



