— 103 — 



c. 5 mm. longum, inferius obcordatum emarginatum, c. 10 mm. 

 latum, c. 8 mm. longum; palatum valde elevatum (galeiforme), 

 laeve; calcar elegans, angustum, 6 — 7 mm. longum, leviter cur- 

 vatum; capsula ovoida; semina subglobosa vel globoso-ovoidea, 

 scrobiculata, c. 0,30 mm. longa, cellulae testae leviter denseque 

 striatae. 



Related to U. bifida and U. WalUchiana Wight; it has about the 

 same shape of the seed-testa and of the bladders as U. bifida (see Fig. 2), 

 also the prominence of the innerside of the bladder-stalks mentioned by 

 Goebel (Ann. Jard. Buitenzorg, IX, 73, fig. 54j occurs in our species, 

 the leaves, stolons and rhizoids are very like those of IJ. bifida, but the 

 leaves are much more numerous and large, further 3- (rarely 5-) nerved 

 (not uninerved). It is also easily distinguable by the long flower-stalks, 

 the large underlip of the corolla and the narrow spur. 



H. N. Ridley (Journ. of Botany, vol. 33, 1895, p. 11) describes 

 an U. involvens from the Malay Peninsula (Kedah), which comes near 

 to our species. It differs in the narrower leaves, the much higher stem 

 {'^circiter pedalis") , the shape and largeness of the calyx lobes and the 

 straight spur, but the description is very incomplete, e. g. the bladders 

 and the fruit are not mentioned. 



Very common in river-beds in the jungle all over Koh Chang. Some 

 specimens were submerse, other terrestrial. Flowers yellow. Collected 

 (with flowers) at Klong Munse (Jan. 5th & 18th (No. 61), Klong Son 

 (Feb. 28th, No. 679 b), and Klong Prao (March 8th, No. 704 a). 



