iniNOCoTYLEDOXS AND DIroTYLED<jNS 



271 



vulus family {Convolvulacece). Allied with it are Polemo- 

 niuni and Pill ij.r (Fig. 310, b) [Polemoiiiacew), the gentians 

 {Gentianacew), and the dog-banes (Apocyn((cew) (Fig. 257). 

 It is here that the regular sympetalous flower reaches its 

 highest expression in the form of conspicuous tubes, fun- 



Fia. 256. A clnster of Bkododendron flowers.— After Hooker. 



nels (Fig. 358), trumpets, etc. The flowers are tetracyclic 

 and anisocarpic, besides being hypogynous and actinomor- 

 phic. These regular tubular forms represent about flve 

 thousand species, and contain many of the best-known 

 flowers. 



