NATURAL HISTORY OF PLANTS. 



Old World, whose leaves are alternate, imparipinnatc, rarely 1-3-. 

 foliolato, the polygamous flowers are nearly always trimerons, more 

 rarely with four or five parts. The gamosepalons calyx and the 

 petals, imbricate or nearly valvatc, are inserted on a more or less 



BQSwcllia papyracea. 



Fig 280. Hei-maphrodite flower (-f ). 



Pig. 281. Longitudinal section 

 of flower. 



concave receptacle, often cup-shaped, more rarely in the form of a 

 deep sac ; this characterises Santiria, often separated generically 

 from Canarium for this reason. The stamens, generally six hi num- 

 ber, and more or less perigynous, are usually free, more rarely mona- 



delphous at the base. The majority 

 BoswdUa papt/mcca. of the charactcrs of any importance 



are therefore most variable in 

 this genus ; but all its species 

 have this in common, that their 

 fruit is an elongated th'upe, often 

 trigonal, with a very thick and hard 

 stone, hollowed into several cells, 

 only one being usually developed, 

 and containing a seed having 

 a thick oily embryo with entire 

 or cut and contortuplicate cotyle- 

 dons } The perigynous nature, that 

 is to say, the concave form of the 

 receptacle, is still more accentuated in the Garvgas., trees from Asia 

 and Oceania, whose flowers are pentamerous, diplostemonous, 

 having an ovary with four or five cells, and whose fruit is 

 drupaceous, globular, but with many monospermous stones 



Fig. 282. Fruit. 



Fig. 283. Dehiscent 

 fruit. 



1 Near Canaritmi is placed Trigonochlamijs, 

 iucompletely known and having polygamous, 

 trimurous flowers. The sepals are verj- large, 

 valvate; and the petals much shorter and nar- 

 rower. The six stamens, sterile in the female 

 flowers, are inserted on the edge of a small con- 



tinuous disk surrounding the gyna;ceum. This 

 has a free, globular, depressed ovary with three 

 bi-OTulate cells. T. Oriffithii is a tree from 

 Malacca, with alternate, compound-imparipin- 

 nate leaves, and ramified inflorescence, axillary 

 or terminal. 



