38 Key to the System of 



Flowers crowded within a turgid almost closed re- 

 ceptacle. 



Trees oftener evergreen than with deciduous foliage ; flowers 

 minute ; staminate pistillate and neuter flowers distinct. 

 "Figtrees." Picus. 782 



181. Calyx consisting of sepals. 



Weak herbs, beset with hooked hairlets ; leaves entire ; 

 stipules absent ; sepals usually four ; stamens four, inflected 

 while in bud ; stigma one. ' Parietaria. 783 



Calyx lobed. 



Weak herbs ; leaves denticulated ; stipules present ; calyx- 

 lobes two to five ; stamen one ; stigma one. 



Australina. 784 



CASUAHZNEAE. 



182. Fruit-bearing bracteoles lignescent, blunt or simply 



acute or far less frequently thorn-like pointed. 



Annual concentric layers of wood well marked ; medullary 

 rays very conspicuous ; ample vascular tubes and paren- 

 chyma well developed in the wood. Figure 25. 



Casuarina. 785 



PHVTOX.ACCEAE. 



183. Fruitlets two or more, distinct, on or around a columnar 



axis. 



Herbs or shrubs ; valves rigid. Figure 43. 



Didymotheca. 790 



Fruitlets numerous, coherent into an almost bell- 

 shaped fruit. 



Shrubs or oftener small trees ; fruitlets bursting along the 

 inner edge ; valves membranous. Coclonocarpus. 791 



FXCOXDEAE. 



184. Calyx consisting of sepals. 



Always herbs; leaves scattered or crowded at intervals, 

 never very succulent ; sepals five ; petals few ; stamens 

 few or several ; staminodia present ; fruit membranous, 

 bursting longitudinally, many-seeded. Figure 41. 



Mollugo. 792 



Calyx lobed 185 



