MORPHOLOGICAL AND BIOLOGICAL NOTES 
ON RAFFLESIA FLOWERS, 
OBSERVED IN THE HIGHLANDS OF MID-SUMATRA 
(Padangsche Bovenlanden) 
BY 
P. TH. JUSTESEN, 
With plate XIX—XXXI. 
During a tour in the Highlands of Sumatra (Padangsche Bo- 
venlanden) from January to July 1920 I happened to find some 
few new spots, where Rafflesia flowers were growing in consi- 
derable numbers, and I was able to keep these places and also 
two others, already known, under observation during a period 
of four months. In the following pages I intend to give a brief 
report of what IT have observed myself on this subject, accom- 
panied by some photographs showing the chief anatomical fea- 
tures of the flowers of both sexes and of the fruit. Not being 
a botanist I am not able to determine the species observed by 
me with certainty. I have tried to do so making use of the 
“Botanisch overzicht der Raffesiaceae van Nederlandsch Indié, 
Batavia 1918” by S. H. Koorpers. As far as I could see, all 
specimens found by me were of one and the same species, and 
agreed very well with the given descriptions and pictures of 
R. Arnoldi, and with none of the others described. 
The Raffesia places, alluded to above, I found when travel- 
ling along the river Si Anok, following its course from Fort de 
Kock towards the North, and the two, which were already 
known before, are situated upon the slope of an old much de- 
nuded volcano not far from the Malay village Batang Paloepoeh. 
In entering on my subject I will give a general description 
of the different localities, in which I observed the flower. It has 
