167 



II. Two still growing branches with a number of leaves, all 

 of them alternate. 



Jasminum, Ho7\sjieldii Miq. 

 Habitat Banka. 

 Coll. November 1896. 



Leaf with double apex, the midrib splitting up already under 

 the middle. 



APOCYNACEAE. 



Plumeria acutifoUa Poir. 



Habitat Mexico. 



Coll. January, March, April 1895, May 1896. 



In our paper of 1895 ') we had an opportunity of drawing 

 attention to a leaf of Plumeria acutifoUa which bears on the 

 back of the blade a stalked pitcher. Already at that time we 

 entered into a comparison of that case with Trifolium repens, 

 in which, as in strawberries (p. 153), it may occur that 

 the apical portion of the terminal leaflet through a series of 

 transitions differentiates to a long stalked pitcher and even, 

 with loss of the pitcher, to a mere thread-like stalk as conti- 

 nuation of the midrib. Mr. Smith has been fortunate enough, ever 

 since 1895, to find a number of different leaves of Plumeria, 

 which mark still stronger the conformity with the phenomena 

 in Trifolium i^epens. 



In that manner Fig. 80 shows the upper portion of a blade 

 with two foliaceous excrescences springing from the midrib 

 exactly side by side another. The left outgrowth, light coloured 

 in our figure, coheres upwards with the unequal apex, whereas 

 the right one, dark toned, is much smaller and does not 

 reach the end of the midrib. The different tinges correspond 

 with those of the upper- and undersurfaces of the blade and 

 indicate that the two excrescences have their light inferior 

 surfaces facing one another. For the sake of clearness it should 



1) Annales de Buitenzorg Vol. XIII p. 97 — 120. 



