32 Key to the System of 



STACK.HOTJSIEAE. 



149. Lower portion of petals cohering or connate into a tube. 



Herbs or half-shrubs ; calyx five-lobed ; fruitlets usually 



three. Figure 29. Stackhousia. 717 



SAPINDACEAE. 



150. Outer portion of fruit membranous. 



Shrubs from quite dwarf to very tall, rarely somewhat 

 herbaceous ; calyx four- or five-lobed ; petals none ; fruit 

 two- to six-celled ; seeds small, without any appendage. 

 Figure 27. Dodonaea. 721 



Outer portion of fruit almost crustaceous or lignescent 151 



151. Calyx entire or irregularly denticulated. 



Shrubs or small trees ; leaves simple, entire or lobed ; 

 petals none; fruit with four or less lobes, scarcely bursting; 

 seeds rather large, about half enclosed in a succulent 

 appendage. Heterodendroii. 729 



Calyx five-lobed. 



Trees, not rarely tall ; leaves pinnate, leaflets large ; petals 

 minute ; fruit two- or three-lobed, often bursting irre- 

 gularly; seeds rather large, high- enclosed in a succulent 

 appendage. Nepheliiim. 730 



ZTTGOPHYLLSAE. 



152. Fruit simple. 



Shrubs; leaves simple, scattered or fascicled, succulent; 

 flowers many, terminal ; petals curved inward at the 

 margin, whitish; fruit one-seeded, hard inside, succulent 

 outside. Figure 17. Nitraria. 731 



Fruit compound ... ... ... ... .- 153 



153. Fruit angular or lobed, succulent, dehiscent. 



Herbs or shrubs, always succulent ; leaves forming usually 

 only one pair of leaflets ; flowers solitary ; petals flat, 

 tender, often yellow ; fruit four- to five-angled, bursting 

 longitudinally. Figure 16. Zygophyllum. 732 



Fruit divided into hard indehiscent long-coherent 

 fruitlets. 



Herbs ; leaves forming usually several pairs of pinnately 

 arranged thin leaflets ; flowers solitary ; petals flat, tender, 

 often yellow. Tribulus. 738 



