ON STIPULES 



33 



' parait liee assez intimement avec la symetrie generale 

 des plantes, car elles existent ou-manquent dans toutes 

 les especes d'une famille : ainsi, on trouve des stipules 

 dans les Rubiacees, les Malvacees, les Amentacees, les 

 Legtimineuses, les Rosacees, etc., et elles manquent 

 dans toutes les Caryophyllees, les Myrtacees, &c.' 



Fig. 45. Potamogeton luckns, 

 showing intrapetiolar stipules. 



Fig. 46. Polygonum, showing 

 Ocrea (o). 



This, however, is not so general a truth as De 

 Candolle imagined. The absence of stipules is not com- 

 plete in either of the families mentioned by him. They 

 occur not only in Spergula and Spergularia, which are 

 now generally considered as belonging to the Caryo- 

 j>/n/l(ace> (though certain botanists regard them as con- 



