374 



TREMANDRACEjE. 



[Hypogynous Exogens. 



Order CXXXII. TREMANDRACEjE.— Poreworts. 



Tremandraceie, R. Brown in Flinders, p. 12. (1814) ; DC. Prodr. 1. 343. (1824) ; Endl Gen. ccxxxii. 



Diagnosis.— Sapindal Exogens, with partially complete symmetrical flowers, a valvate 

 calyx, and 2-i-celled anthers opening by pores. 



Slender heath-like shrubs, with their hairs usually glandular. Leaves alternate or 



whorled, without stipules, entire or toothed. Pedicels 

 solitary, axillary, 1 -flowered. Flowers often large and 

 showy. Sepals 4 or 5, equal, with a valvate aestivation, 

 slightly cohering at the base, and deciduous. Petals 

 equal in number to the sepals, with an involute eestiva- 

 tion, wrapping up the stamens in pairs, much larger than 

 the calyx, and deciduous. Stamens hypogynous, distinct, 

 2 before each petal, and therefore either 8 or 10 ; anthers 

 2- or 4-celled, opening by a pore at the apex. Ovary 

 2-celled ; ovules from 1 to 3 in each cell, anatropal, with 

 a hooked apex, pendulous ; styles 1 or 2. Fruit capsular, 

 2-celled, 2-valved ; dehiscence loculicidal. Seeds pendu- 

 lous, ovate, with a hooked appendage at the apex, but 

 with none about the hilum ; embryo cylindrical, straight, 

 in the axis of fleshy albumen, and about half as long, the 

 radicle next the hilum. 



There is little to divide these plants from Milkworts, 

 except their regular symmetrical flowers, and valvate 

 calyx. They want the caruncula of that Order, in room 

 of which they have the chalazal end of the seed extended 

 into a hooked process. Their stamens being opposite the 

 petals in pairs may, taken with the valvate calyx, be 

 regarded as an indication of some tendency towards 



Rhamnads, and the general condition of their flower is much like that of Pittosporads, 



except in the great development of the embryo. 

 All are natives of New Holland. 



Their properties are unknown. . . 



De Candolle placed them between Milkworts and Pittosporads, Meisner between 



Frankeniads and Milkworts, Endlicher in his Polygalinse consisting of Poreworts and 



Milkworts only, and Adolphe Brongniart takes the same view of their affinity. 



Fig CCLX. 



GENERA. 



Tetratheca, Sm. 

 Tremandra, R. Br. 

 Platytheca, Steetz. 



Numbers. Gen. 3. Sp. 16. 



Position. 



TiliacecB. 

 -Tremandrace*. — Polygalacese. 



Pittosporacece. 



Fig. CCLX— Tetratheca hirsuta. 1. the stamens ; 2. the pistU, with one of the cells laid open. 



