CLASSIFICATION OF DICOTYLEDONS. 



205 



on account of their fine foliage and flowers. The leaves are 

 always one-sided, and the flowers monoecious. 1 Whether the 

 begonias properly belong with the Passiflorinw has been ques- 

 tioned. 



The fifth order (Myrtiflorm) have regular four-parted flowers 

 with usually eight stamens, but sometimes, through branching 



D 



FIG. 113. CalyciflorsR (Myrtiflorse, Thymelinse). A, flowering branch of 

 moosewood, Direct (Thymeleaceas) , x 1. B, a single flower, x 2. C, the 

 same, laid open. D, a young flower of willow herb, Epilobium (Onagracese) , 

 x 1. The pistil (r/y.) is not yet ready for pollination. E, an older flower, 

 with receptive pistil. F, an unopened bud, x 1. G, cross-section of the 

 ovary, x 4. H , a young fruit, x 1. J, diagram of the flower. J, flowering 

 branch of water milfoil, Myriophyllum (Haloragidacese) , x %. K, a single 

 leaf, x l. L, female flowers of the same, x 2. M, the fruit, x 2. 



of the stamens, these appear very numerous. The myrtle family, 

 the members of which are all tropical or sub-tropical, gives name 

 to the order. The true myrtle (Myrtus) is sometimes cultivated 

 for its pretty glossy green leaves and white flowers, as is also 



1 Monoecious : having stamens and carpels in different flowers, but on 

 the same plant. 



