By Thomas Bruges Flower, Esq. 311 



South Division. *' 



1. South-east District, " Sides of the river Avon near Salisbury." 

 Dr. Maton. Bot. Guide. This plant has not been found for some 

 years. Perhaps only the outcast of a garden, or possibly mistaken 

 for the next species. 



2. l.fulva (Nutt) American Balsam. Engl. Bot. Suppl. ^.2794. 

 Mr. James Hussey informs me that this species has become quite 

 naturalized by the river side about a quarter of a mile above Little 

 Durnford, where it was first discovered by Mr. Edward Hinxman. 

 Through the kindness of the former gentleman I have been favored 

 with a specimen. 



The elasticity of the capsule in this genus has been beautifully 

 explained by Professor Lindley. " The tissue of the valves " says 

 this excellent botanist " consists of cellules that gradually diminish 

 in size from the outside to the inside, and the fluids of the external 

 cellules are the densest. The latter gradually empty the inner 

 cellules and distend themselves so that the external tissue is dis- 

 posed to expand and the internal to contract whenever anything 

 occurs to destroy the force that keeps them straight. This at last 

 happens by the disarticulation of the valves, the peduncle, and the 

 axis, and then each valve rapidly rolls inwards with a sudden 

 spontaneous movement." 



M. Dutrochet proved that it was possible to invert this pheno- 

 menon by producing Exosmose, for that purpose he threw fresh 

 valves of Impatiens into sugar and water which gradually emptied 

 the external tissue, and after rendering the valves straight at length 

 curved them backwards. 



ORDER. OXALIDACE^. (DE CAND.) 



OxALis, (Linn.) Wood-Sorkel. 

 Linn. CI. x. Ord. iv. 



Name. An old Latin and Greek appellation derived from {oxus) 

 sharp or sour. 



1. 0. Acetosella (Linn.) Sour-Wood Sorrel, Sour Trefoil, Stubwort, 

 the name (" Acetosella ") is a dimin. of Acetosa an eld name of 



2 e2 



