56 Platanaceae 



obdiplostemonous, but sometimes haplostemonous, more 

 rarely co . Carpels seldom free and as many as petals, 

 mostly fewer, often two. Styles mostly free. Ovary 

 2-1 -loc with swollen placentae bearing oo ovules in 

 several rows. Seeds minute with copious endosperm 

 and small embryo. 



Subfamily i. Saxifragoideae. Herbs with spiral 

 leaves. Flowers mostly 5-merous. Carpels 2, rarely 3-4, 

 free or united below. Ovules with two integuments. 



Tribe i. Saxifrageae. Carpels rarely free, but styles 

 always free. 



Flowers 5-merous with corolla. Placentation axile. 



Saxifraga. 



Flowers 4-merous with no corolla. Placentation 

 parietal. Chrysosplenium. 



Tribe 2. Parnassieae. Carpels (3-4) forming syn- 

 carpous gynaecium. Style short or absent. 



Parnassia. 



Subfamily 2. Ribesoideae. Shrubs with simple 

 exstipulate leaves. Flowers in racemes. Stamens 5. 

 Ovary inferior, i-loc, with parietal placentae. Fruit a 

 berry. 



Only genus : Ribes. 



Suborder 2. ROSINEAE. Carpels 00 -i. Ovules with. 

 two integuments. Endosperm scant}^ or absent. 



Fam. 3. Platanaceae. Trees with bark separating 

 in large scales. Leaves spiral, 3-5-lobed, with large 

 connate stipides. Flowers in globose heads, diclinous, 

 cyclic, heterochlamydeous, actinomorphic, 3-8-merous, 

 typically isomerous with four alternating whorls but 



