191(5J Krocbcr: Floral Relations Among tlie Galapagos Islands 211 



cant break in this series is the twenty-nine of Barrington. This I 

 cannot explain by location, for while Barrington is much farther from 

 Albemarle than is Jervis, it is imicli nearer than Gardner; and if it 

 is near enough to Indefatigal)]e to liave l)een especially stocked by local 

 species from that large island, Seymour is nearer still, and Gardner 

 is almost a part of Hood, >('t these both sliow the presence of more 

 Albemarle forms. Such cases as this, of which several occur, must 

 therefore be set doAvn as due to "accident," as we may call the various 

 unknown minor causes that it is impossible to follow in detail. 



CHARLES 



Charles shows more affinity with Chatham — 188 to 173 — than with 

 nearer, larger, and florally richer Albemarle. This is the first instance 

 of several pointing to a special relationship between the southeastern 

 islands of Charles. Chatham, Hood, and Gardner, which constitute a 

 fairly defined botanical province of the Galapagos. It is clear for 

 one thing that the conditions at least for the variety of plant life are 

 on the whole more favorable in these islands than elsewhere in the 

 archipelago. Charles and Chatham are very much smaller than Albe- 

 marle, yet contain virtually as many species as it; they are consider- 

 ably surpassed in area by Indefatigable, yet, according to available 

 information are fully half as rich again in forms. Hood has as many 

 species as Narborough, yet is only a fraction as large. Gardner seems 

 to be distinctly the smallest and lowest of the five islands referred to 

 in the preceding paragraph, yet it has no fewer different forms. 



Narborough and Hood stand in a relation to Charles opposite to 

 that whicli they hold towards Albemarle. From sixty-nine and fifty- 

 eight, the figures reverse to fifty-two and sixty-six. It is probably 

 not so much that Hood is nearer in miles than Narborough, as that 

 it forms part with Charles of the southeastern province just referred 

 to, whereas Narborough from its peculiar position must be in some 

 measure especially dependent on Albemarle. The same may be said 

 concerning the high figure (forty-four) which Gardner shows toward 

 Charles as compared with the thirty-eight, thirty three, thirty-three, 

 tliirty-two of the four other islands of similar floral wealth. 



CHATHAM 

 Chatham reveals the same affinities with the members of its own 

 province as Charles, though not in so ])ronounced a form: species in 

 common with Albemarle (325), 175. with Charles (319). 188: witli 



