48 



Leaves on long petioles, all radical, Gunnera, 



Leaves sessile, entire or toothed. Prostrate lierbs, Serpicula. 



Leaves whorled, pectinate parted. Aquatic. Myriophyllum. 



Leaves opposite, entire. Flowers unisexual. Callitriche. 



1 Serpicula, Linn, 

 repens, Linn, 



2 Grunnera, Linn, 

 perpensa, Linn. 



List of Specie.*^. 



3 Myriophyllum, Linn, 

 A, spicatum, Linn. D, 



4 Oallitriche, Linn, 

 A-E. Bolusii, Sch. & Pax, E. 



ORDER LXV. RHIZOPHORE^. 



This Order is for the most part a tropical one, and it includes the 

 two genera popularly known as " Mangroves." The wood of several of 

 the species is durable, and our Weihea and Cassipourea are both hand- 

 some trees well worthy of cultivation. 



>s umber of species about 50. 



(Ex. ]VL\NGR0VE.) 



Ovary inferior . Seed germinating within the fleshy fruit. 

 Ovary superior or half inferior. Fruit capsular. 



1 Calyx 4 fid. Petals 4. Rhizophora. 



1 Calvx 5-12 fid. Petals 5-12, two fid, Bruguiera, 



2 Petals 4-1 () multifid. Stamens 20-30. Weihea. 



2 Petals 1-5 multifid. Stamens 10. Cassipo[jrea. 



1 Rhizophora, Linn. 

 mucronata, Lam. 



2 Bruguiera, Lam. 

 gymnorhiza, Lam. 



List of Species, 



A. 



3 Weihea, Spr. 

 Gerrardi, Schinz. 



4 Oassipourea, Auhl, 

 verticillata, N.E.B, 



ORDER LXVL COMBRETAC^E^, 



.\nother almost entirely tropical Order, consisting of trees and 

 shrubs, some of which are possessed of useful properties. Some yield 

 excellent timlier, others are useful on account of the amount of tannin 

 contained in their bariv or fruits The fruits of Terminalia Chebula 

 are known as " Myrabolans " and used fcr tanning, and the galls on 

 the leaves are used for the same purpose. The leaves of several species 

 of the genus Terminalia form the food of the " Tussa " silkworm. 

 7'. catiippa is a handsome tree, and its fruits are eatable. T. angusti- 

 folia yields a white, scented gum, which is used as a cosmetic and for 



