4h NATURAL HISTORY OF PLANTS. 
ought perhaps to be distinguished only by the title of sections. 
Tersonia’ has the diccious flowers of Gyrostemon, with less 
numerous stamens arranged upon a single verticil. But the fruit 
Didymotheca thesioides. 

Fia. 74, 
Female flower (19). 

Fra, 76. 
Dehiscent fruit (12). 

Fia. 75. Fig. 73. 
Longitudinal section of female Female floriferous Seed (12). 
flower. branch. 
instead of being formed of free carpels is constituted of some twenty 
cells with thick walls,” united in a woody mass, and quite indehiscent. 
One or two Australian’ Zersonias are known, the vegetative organs 
being the same as those of the Cyclostemon ramulosus. 
Didymotheca (figs. 73-77) represents a lessened type of Gyros- 
femon, in which the flowers are dicecious and tetramerous. The 
perianth is there represented by a small calyx with four deep 

1 Moq., Prodr., 40.—Gyrandra Moq., (ol, 3 BENTH., Fl. Austral., v. 149. 
nec WALL.), loc. cit. 4 Hook. F., in Hook, Journ., vi. (1847), 278. 
2 Traversed at its exterior surfacs by pro- —Mog., Prodr., 36. 
jecting wrinkles circular and horizontal. 
