484 NATURAL HISTORY VL' PLANTS. 



one, containiug nearly three hundred and twenty species all belong- 

 ing to the warm regions of the world. One Ilelia, it is true, 

 extends from North China to the northern banks of the Mediter- 

 ranean. To the south, the genus Epicluo-is is also represented by a 

 Xew Zealand species, the Cape of Good Hope again possesses a 

 species of Ekehergia and two species of Turrœa. But the majority 

 of the genera are tropical. The genus Trichilia, existing in the 

 warmest parts of Africa and South America, does not advance in 

 North America beyond the warm parts of Mexico. The Lansiums in 

 tropical Asia stop at the Himalayas. Except Melia, met with in 

 both worlds, and, as we have seen, even in the temperate parts, all 

 the genera of the Meliecc series are peculiar to the tropical regions 

 of the old world. The genus Turrœa, the most widely -extended 

 of these genera, is found at the Cape, Madagascai", and the Mascarine 

 Islands, in tropical Asia and Oceania, and in tropical eastern and 

 western Africa. Australia possesses the genera Si/)ioum, Ilcarnia, 

 and Owenia. Tropical America presents as special genera Guarca, 

 Cahralea^ Swietenia, and Elutheria ; she divides with the old world 

 the genera Melia, Trichilia, and Cedrela, to say nothing of Carapa, 

 consisting of coast plants which, like the mangrove, are met with on 

 all the tropical shores of both worlds. We may estimate the species 

 peculiar to the new world at almost a hundred (nearly a third of the 

 family). 



The characters up to the present constant in this family are : 

 alternation of the leaves, absence of stipules, regularity of the 

 ilowers and primitiro direction of the descendent ovules, with the 

 micropyle turned upwards and outwards.^ Other characteristics, 

 which, although not constant, are at least very rarely wanting, 

 being : the hermaphrodism of the flowers, the independence (between 

 themselves) of the parts of the corolla, the definite number of the 

 pieces of the audroccum (isostemonous or diplostemonous). The 

 characters which, on the contrary, vary the most, are : the union or 

 independence of the staminal filaments, the number of the ovules 

 and seeds, the presence or absence of a wing on the seeds and of 

 albumen inside them ; then the simple or compound character of the 

 leaves, the relations of the sepals to each other and the mode of 



Not to speak of the union of thu ovarian part of the carpels to whieh we shall refer presently. 



