159 



Coll. May 1896. 



The normal leaves are bipinnate, viz. the whole leaf 7-paired 

 equally pinnate and the leaflets many-paired equally pinnate. 

 A deviation often presenting itself in the Buitenzorg Gardens 

 consists in the appearance of an extra many-paired pinnate 

 leaflet springing from the base of the petiolules of 1, 2 or 3 

 of the superior leaflets (fig. 62). 



In one case the additional leaflet had the topmost pair of 

 leaflets grown together as is shown in figg. 63 and 64. 



Our figures make it more probable that the extra leaflet is 

 to be considered as a product of dichotomy of the petiolule 

 and is consequently to be compared with the whole leaflet 

 from which it springs. 



PLUMBAGINACEAE. 



Plumbago rosea L. 



Habitat Tropical Asia. 



Coll. January 1895. 



One of the leaves transformed into a pitcher (fig. 65). 



Petiole very long as frequently occurs with pitchers. 



CONVOLVULACEAE. 



Jpomaea spec. 



Coll. August 1895. 



Leaf with double apex. As fig. 66 shows there is, as usually 

 in double tops, no question about a divided midrib nor about 

 a stunted one. The midrib is simply shorter than in normal 

 leaves whereas the lateral veins show a stronger development. 



Ipomaea mammosa Cliois. 



Habitat Cochinchina. 



Coll. December 1895. 



A leaf having the shape of a cup terminates the stem. The 

 petiole 2 cM. long follows the line of the stem, produced, but 

 is distinct from it by less firmness; of a bud there is no trace 

 to be seen (fig. 67). 



