632 



BOTANY 



PART II 



perigynous. Ovary septate. Increase in number of the stamens is 

 frequent. 



Family 1. Lythraceae. Lythrum salicaria. Purple Loosestrife. K6, C6, A 6 

 + 6, G(2). Heterostyled with three forms of flower (ef. p. 311). 



Family 2. Melastomaceae. An exclusively tropical family, easily recognised l>y 

 the beautifully shaped and regularly veined leaves. Favourite hothouse plants. 



Family 3. Onagraceae ( :!3 ). K4, C4, A 4 + 4, G(4). Androecium obdiplo- 

 stemonous. Ovary inferior (Figs. 690, 691). 



MOKE IMPORTANT GENKIIA. Epilobium, Willow-herb, with numerous spcch * : 

 the fruit is a capsule, and the seeds have hairs serving for wind- dispersal. 

 Ocnothera. The power of mutating possessed by plants of this genus was recognised 

 by DE TRIES and forms the experimental basis of his hypothesis of mutation. 

 Circaea, Enchanter's Nightshade. 

 Trapa, Water Nut. Many forms 

 are in cultivation, for instance 

 the species of Fuchsia, in which 

 the calyx is petaloid. These 

 plants are natives of America. 

 Fruit, a berry. 



Family 4. Halorrhagi - 

 daceae ( 35a ). Aquatic plants 

 with small, inconspicuous flowers. 

 Myriophyllum. Hippuris. 



Km. ti90. Floral diagram of Oe>inth> TH 

 (Onagraceiie). 



Kit;. 031. Fiichxic 



Flowers (nat. si/e). 



Family;".. Rhizophoraceae ( 36 ). Plants occurring in the .Mangrove formation 

 along tropical coasts, characterised by vivipary and the possession of stilt-routs m 

 i-es]iiratory roots. These adaptations are related to the peculiarities of the 

 situations in which the trees grow, llhizophora (Fig. 692) ; Bruguicra ; Ceriopr. 



Family 6. Combretaceae. TcrminaUa Chebula yields HTBOBALAN8. 



Family 7. Myrtaeeae. Evergreen shrubs or trees; leaves opposite, 

 leathery, often aromatic. Flowers actinomorphic, tetramerous or 

 pentamerous. Androecium of many stamens, which are often arranged 

 in bundles which have originated by branching. Carpels two to 

 many, united with the floral axis to form the inferior ovary. Fruit, 

 usually a berry or a capsule. 



IMPORTANT GENERA. The Myrtle (Afyrtus communis), which occurs in the 

 Mediterranean region, is the only European species. Species of Eucalyptus, from 



