1916] Kroeher: Floral Belations Among the Galapagos Jslands 207 



species. Meanwhile, however, a large body of fresh information on 

 the botany of the Galapagos had been released for use through the 

 publication of Dr. Alban Stewart's "A Botanical Survey of the Gal- 

 apagos Islands,"* which it had been my lot to conduct on its course 

 through the press. This monograph not only incorporates all the 

 data available to Professor Robinson, but includes a wealth of new 

 material secured by the author during a stay of more than a year 

 in the archipelago. ]\Iany irregularities in Professor Robinson's data, 

 due to imperfect exploration up to his time of writing, are corrected 

 b}' Dr. Stewart. Thus Albemarle, by far the largest of the islands, 

 now is known to have also the largest number of species, whereas 

 before it was reckoned only third. So also Indefatigable, the second 

 greatest in area, was formerly represented by less than a third as 

 many species as much smaller Chatham, whereas now the figures are 

 193 and 306. It is therefore preferable to use Dr. Stewart's data. 

 These are first shown in Table V, which is a direct reproduction from 

 Dr. Stewart's monograph,^ except that it is geographically rearranged. 

 Dr. Stewart's essay is only part of what he hopes to issue on 

 Galapagos botany,** and his discussion of botanical conditions on each 

 island is reserved for the unpublished portion of his work. His 

 table from which my Table V is taken is, however, based on the same 

 unfortunate alphabetical arrangement as Professor Robinson's; and 

 at the only point where he touches on the question of inter-island 

 relationships, he seems to incline to Professor Robinson's view that 

 the distribution of Galapagean plants runs counter to the geographical 

 position of and distances between the islands. Thus -J 



If oceanic currents were an important factor in the transport of seeds . . . 

 the several islands of each group [in the archipelago] should have a larger 

 floral element common among themselves than with any of the islands of the 

 other group. The following table shows the percentages of floral relationships 

 between the islands of the northern group, as well as their relationships with 

 some of the more important islands of the southerns group. 



•1 Proc. California Acad. Sciences, ser. 4, I, 7-288, 1911: Expedition to the 

 Galapagos Islands, 1905-1906, II. 



5 Ihid.. p. 237. 



^Ihid., p. 9, 



■^ Ihid., p. 240. 



8 Dr. Stewart's "groups" here are different from mine. His "northern" 

 islands are Abingdon, Bindloe, Tower, Wenman, Culpepper, his "southern" ones 

 all the remaining islands of the archipelago. 



