256 



CONCLUDING REMARKS 



Chap. VI. 





Table 35. 





List of 



Genera including Heterostyled Species. 



Dicotyledons. 



Dicotyledons. 



■ 



Cratoxylon. 



Hypericins. 



Mitchella. 



Bubiacese. 



Erythroxylum. 



Erythroxylese. 



Diodia. 





Sethia. 



a 



Borreria. 



(4 



Linum. 



GeraniacesB. 



Spermacoce. 



44 



Oxalis. 



a 



Primula. 



Primulacese. 



Lythrum. 



Lythraceae. 



Hottonia. 



44 



Nessea. 



a 



Androsace. 



44 



Cinchona. 



Rubiacese. 



Forsythia. 



Oleacese. 



Bouvardia. 



ii 



Menyanthes. 



Gentianacese. 



Manettia. 



/ 



Limnanthenium. " 



Hedyotis. 



(< 



Villarsia. 



(< 



Oldenlandia. 



44 



Gilia. 



Polenioniacese, 



Houstonia. 



44 



Cordia. 



Cordieae. 



Coccocypselum. 



44 



Pulmonaria. 



Boraginese. 



Lipostoma. 



44 



^Egiphila. 



Verbenacese. 



Knoxia. 



44 



Polygonum. 



Polygonese. 



Faramea. 



44 



Thymelea. 



Thymelese. 



Psychotria. 



44 







Eudgea. 



44 



Monocotyledons. 



Suteria. 



44 



Pontederia. 



Pontederiacese 



In some of these families the heterostyled condition 

 must have been acquired at a very remote period. 

 Thus the three closely allied genera, Menyanthes, 

 Limnanthenium, and Villarsia, inhabit respectively 

 Europe, India, and South America. Heterostyled spe- 

 cies of Hedyotis are found in the temperate regions 

 of North and the tropical regions of South America. 

 Trimorphic species of Oxalis live on both sides of 

 the Cordillera in South America and at the Cape of 

 Good Hope. In these and some other cases it is not 

 probable that each species acquired its heterostyled 

 structure independently of its close allies. If they 

 did not do so, the three closely connected genera of 

 the Menyanthes and the several trimorphic species of 

 Oxalis must have inherited their structure from a 



