PLANTS JAVANICLE RARIORES. 591 



wanting. This modification is necessarily accompanied by 

 a different aestivation, which in all the other genera is 

 quincuncial, the lateral lobes of the lower lip overlapping 

 the upper, which covers the middle lobe of the lower. The 

 spur of the tube is found only in one of the two species of 

 Staur anther a. 



The number of antheriferous Stamina, or the difference 

 between the diandrous and didynamons plants of the tribe, 

 is not always of much value ; for in Bidymocarpus there 

 are several didynamous species which certainly do not form 

 a natural section. Stamina inclma and exserta generally 

 mark distinct genera, but yet not in all cases. The differ- 

 ence between parallelism and divarication of the lobes of 

 antherae is always, I believe, of generic importance. The 

 various degrees of confluence of the divaricate lobes, and 

 the apparently peculiar dehiscence in some of its modifica- 

 tions, seem not to be of equal value. 



The Stigma exhibits various remarkable differences, 

 some of which are considerable, though not alwavs of 

 equal, value in the definition of genera. The most im- 

 portant of these, and which hitherto has been overlooked, 

 is the abortion, or great reduction in size, of the upper lip, 

 while the lower is proportionally dilated, and, in some 

 cases, deeply divided. Thus in Chirita, in which the 

 stigma is described as bilamellar, both lamellae belong to 

 the lower lip, And in many species of Didymocarpus the 

 apparent obliquity of stigma arises from the abortion of 

 the upper lip, and the lamellar expansion of the lower, 

 which, however, is never divided as in Chirita. In several 

 genera the lips are equal, and either lamellar or so short 

 as to be hardly distinguishable ; in other cases there is no 

 trace of division. These different modifications, in most 

 cases, mark the limits of genera. 



As some of the most important characters of the tribe 

 reside in the structure of Ovarium and Pericarfium, so 

 the principal natural divisions are founded on modifications 

 of the same organ. The ovarium may be in all cases de- 

 scribed as properly unilocular : though, from the approxi- 

 mation and slight cohesion of the parallel portions of the 



