214 EVOLUTION OF PLANTS 
beautiful Rhododendrons and Azaleas (Fig. 52, A) are 
familiar, as well as the various species of cranberries, 
huckleberries, wintergreen, etc. The trailing arbutus 
of the Atlantic States, and the manzanita and madrofio 
(Arbutus) of the Pacific coast are also characteristic 
types. The other two orders of the Isocarpe are repre- 
sented by the primroses (Primuline) and the persim- 
mons (Diosporine). 
The great majority of the Sympetale belong to the 
second division, Anisocarpe. These are especially 
abundant in the tropics, where they form the predomi- 
nant constituents of the vegetation. The less specialized 
types are included in the order Tubiflore, with regular 
tubular or funnel-shaped flowers. Here belong the morn- 
ing-glories, the phloxes, and nightshades, all of them 
including familiar wild or garden plants (Fig. 52, F). 
The second order of the Anisocarpe, the Labiati- 
flore, as the name indicates, has flowers which are usu- 
ally strongly bilabiate, ¢.e. are markedly zygomorphic. 
This, together with a reduction in the number of sta- 
mens, indicates a more specialized type than the Tubi- 
flore. The two most important families of the temper- 
ate regions are the figworts (Scrophulariacez) and mints 
(Labiatz), both of which include numerous familiar wild 
and cultivated plants (Fig. 58, A—D). In both of them 
the stamens are reduced to two or four, and they often 
exhibit very perfect adaptation to cross-fertilization. 
Allied to these, and represented in the warmer parts 
of the United States by a few examples, is the Bigno- 
nia family, much more abundant, however, in tropical 
regions. Catalpa and Tecoma (the trumpet-creeper) 
are the genera occurring within our limits. mas 
