88 MISSOURI BOTANICAL GARDEN. 
the Pacific,* where specific or varietal differentiation is 
strongly marked, but where communication between the 
several islands is far more restricted than in the Azores. 
For the purpose of showing at a glance the part played by 
each species of the higher plants, those which compose the 
bulk of the flora are marked with a large *, and those 
which are either rather rare or local are marked with a 
small *. Weeds are marked by af. 
One of the most interesting parts of the study of a 
limited and isolated flora is its ecology. In this respect 
the flora of the Azores is particularly disappointing, 
primarily because of the small number of truly endemic 
species, and secondarily because, notwithstanding their 
remoteness from the continents, the islands have for so 
long a time been stopping points for vessels plying between 
America and Europe that the probability of the introduc- 
tion of plant-visiting insects capable of pollinating little- — 
specialized flowers is almost as great as that of the plants 
themselves. 
Comparatively few insects which take part in the pollina- 
tion of flowers are known to occur in the Azores, and 
though there are some Syrphidae, and probably a few bees, 
in addition to what have been indicated, the number of 
species and of individuals is unquestionably small. How- 
ever, observation in bright weather shows that the Apidae 
and the few flower-frequenting Lepidoptera and flies are 
sufficiently active to leave no doubt as to the important 
part they play in pollination. The greater part of the 
Azorean flowering plants are either anemophilous or 
adapted to pollination by the aid of little-specialized in- 
* Robinson and Greenman, On the flora of the Galapagos Islands, as 
shown by the collection of Dr. G. Baur. Am. Journ. Sci. 150 [iv. 50]: 135. 
+ From Mr. Godman’s Natural History of the Azores, it appears that 
in 1870 he knew the following Azorean insects: Coleoptera, 212 species 
(p. 94); Hymenoptera, 13 (p. 101); Lepidoptera, 28 (p. 106). M. 
Drouet, in his Eléments de la faune agoréenne, further enumerates the 
following: Orthoptera, 5 species (p. 478); Hemiptera, 6 (p. 479); 
Diptera, 4 (p. 483). 
