Apocynaceae 87 



Corolla minute, funnel-shaped. Stamens 4. Stigma 

 peltate. Microcala. 



Corolla salver-shaped. Stamens 4. Stigmas with 

 two lamellae. Cicendia. 



Corolla funnel-shaped, persistent. Stamens 5. An- 

 thers twisted. Centaurium. 



Tribe 2. Swertieae. Style short. Placentae not 

 projecting. 



Only British genus (Corolla subclavate) : Gentiana. 



Subfamily 2. Menyanthoideae. Leaves alternate. 

 Corolla induplicate valvate. Pollen grains compressed. 



Leaves 3-foliate. Corolla funnel-shaped. 



Menyanthes. 



Leaves orbicular, floating. Corolla rotate. Villarsia. 



Fam. 3. Apocynaceae. Shrubs or trees, rarely 

 entirely herbaceous, often climbing. Latex present. 

 Leaves opposite, quite entire. Corolla usually twisted 

 in bud. Stamens 4-5, anthers basifixed. Carpels usually 

 2, free below. Styles united, ending in discoid or 

 globose head which bears the stigmas. Fruit various. 



Subfamily Plumerioideae. Stamens quite free or 

 loosely attached to stigmatiferous head. Thecae mostly 

 without appendages. Seeds usually without tuft of hairs. 



Tribe Plumerieae. Carpels 2, free below the style. 



Only British genus (disc of 2 scales, filaments clavate) : 



Vinca. 



C. Sympetaly constant. Only one whorl of 

 stamens present. Carpels usually 2, always 

 perfectly united. Zygomorphy frequent. iVor 

 B see page 85.) 



a. Perianth hypogynous. (For b see page 98.) 



