102 PHANEROGAMIA. 



each cell of the ovary of Tetratheca juncea, and T. thymifolia, and three 

 (the two upper collateral) in T. affinis. M. Payer is not more fortu- 

 nate in his statement, that Mr. Brown characterized Tetratheca by its 

 tetramerous flowers and biovulate cells of the ovary, and Tremandra 

 by its pentamerous flowers and solitary ovules ; whereas Mr. Brown 

 has refrained from mentioning a single distinctive character of the 

 two genera. It was DeCandolle who inferred that TetratTwca was 

 always tetramerous, and Endlicher, who assumed in his Genera Plan- 

 tarum, that the cells of the ovary were always biovulate, he having 

 previously found them so in his T. affinis and T. setigera, PL Hugel, 

 1. c. The latter species I have not seen. In the former, the single 

 ovary which my specimen (from Drummond's Swan River collection) 

 furnishes, plainly exhibited three ovules in each cell. Both are said 

 by Steetz to have solitary ovules. 



2. Tetratheca ericifolia, Smith. 



T. ericifolia, Smith, Exot. Bot. p. 37, t. 20; Rudge, in Linn. Trans. 8, 1. 11; DC. 1. c. 



Hab. Near Sydney and Newcastle, New South Wales. 



Some of the specimens have the calyx and peduncles nearly gla- 

 brous, as the species is characterized. But in most of them they are 

 beset with scattered glandular-tipped bristles, as they are in other 

 specimens from different collectors; and their stems and leaves are 

 more scabrous. Dr. Steetz has remarked that several species vary in 

 this manner. The cells of the ovary are uniovulate. 



3. Tetratheca thymifolia, Smith. 



T. thymifolia, Smith, Exot. Bot. t. 22 ; DC. Prodr. 1, p. 343. 



Hab. Vicinity of Newcastle, New South Wales. 



There are two ovules in each cell of the ovary, one inserted above 

 the other, the lower one occupying nearly the middle of the ^ell. 

 The sepals in our specimens are scarcely or not at all ciliate. 



