30 
Dr. Suira reared from the seeds of these virescent flowers 
specimens that bore pure white corollas. 
ASCLEPIADACEAE. 
Dischidia Rafflesiana Wall. 
Legit J. G. B. Brome. 
Habitat Dutch Indies. 
Transitional shape between the common flat leaf and the 
well known urn or pitcher (fig. 37). 
COMPOSITAE. 
Bellis perennis L. 
Legit A. Ranr in suo horto Tjinjiroean, August 1915. 
Peduncle (scape) strongly fasciating bearing an extraordinarily 
developed head, the common receptacle splitting up into numerous 
tubelike branches, which produce together innumerable florets. 
A remarkable instance of polytomy in connection with and 
induced by the fasciation of the scape '). (Fig. 38). 
Cosmus bipinnatus Cay. 
Legit A. Ranr in horto H. Huysmans, Buitenzorg, October 1918. 
Habitat Mexico. _ 
Involucre double: outer whorl consisting of 15 bracts of 0.5 
m.m. width, inner whorl of 10 scales of 1.5 m.m. width. Com- 
mon receptacle bears a number of secondary headlets which 
are densely covered with filiform chaffy scales. 
The surface of the semi-globular receptacle is firm like cartilage. 
This case corresponds with that of Bellis both having the 
receptacle divided into numerous growing points but different 
in that in Cosmus no single floret is present and the whole 
receptacle is only covered with bracts (bracteomania). 
RUBIACEAE. 
Psychotria sarmentosa Bi. 
Legit W. M. Docters van Leguwen, Haboko, ae 1919. 
A remarkable instance of biostrepsis. 
1) Compara Worsdell I, p. 44. 
