FLORA OF THE GALAPAGOS ISLANDS. 79 



I am greatly indebted to my colleague, Professor W. G. Farlow, for the 

 treatment of the difficult orders of Fungi, Lichenes, Algae, and Musci, to 

 Dr. A. W. Evans of Yale University for the treatment of the Hepaticae, 

 and to Professor K. Schumann of the Royal Botanical Museum at Berlin 

 for the elaboration of the Cactaceae of the Hopkins-Stanford Expedition. 

 Further expert assistance has been kindly and very promptly given by 

 Mr. Casimir de Candolle of Geneva (Peperomia), Mr. C. B. Clarke cf 

 Kew (Kyllinga), Professor A. Cogniaux of Verviers (Miconia), Piofessor 

 F. Lamson-Scribner of the United States Department of Agriculture 

 (Chloris), Dr. Gustav Lindau of Berlin (Justia'a), and Dr. Hans Hallier of 

 Hamburg (Ipomoea). I am likewise indebted to Sir W. T. Tliiselton-Dyer 

 and Mr. W. Bolting Hemsley for some comparisons at the Royal Gardens 

 at Kew and for a list of the plants collected upon the Galapagos Islands by 

 Dr. A. Habel. Mr. F. V. Coville and Dr. J. N. Rose of the United States 

 Kational Museum have generously furnished me with duplicates of many 

 of the plants secured on the Galapagos and Cocos Islands by Messrs. 

 A. Agassiz and Lee, and also sent several unicates for examination. 

 Professor William Trelease has obligingly forwarded the Galapageian 

 Cactaceae from the Engelmaun Ilerbaiium for comparison. Sir J. D. 

 Hooker has kindly given me interesting data concerning the history of 

 the botanical exploration on the islands, Mr. J. Henry Blake, artist on 

 the " Ilassler," has furnished information regarding that expedition, and 

 Miss Mary A. Day, librarian of the Gray Herbarium, has rendered effi- 

 cient assistance in bibliograpby and tabulation as well as in an exhaustive 

 search for information relating to the early expeditions to the islands. 

 The plates have been drawn by Mr. F. Schuyler Mathews. 



The bryophytes and thallophytes, as yet known to occur on the 

 Galapagos Islands, are so few that they cannot be supposed in any 

 adequate sense representative of the great groups to which they belong. 

 It has, therefore, seemed best to exclude them from the tabular statistics. 

 It may be remarked, however, that their inclusion would not have 

 significantly altered the numerical relations presented. 



Of the following plants, said to have been collected on the Galapagos 

 Islands by Dr. Habel, the identifications (which cannot now be controlled 

 by a reexamination of the specimens) have seemed too doubtful to 

 include in the catalogue : Boerhuavia diffusa, L., Neptnnia triqueli^a, 

 Benth., Rhynchosia Senna, Gillies, Sfylosanthes humilis, HBK., Tribulus 

 terrestris, L. var., Acalypha parvula, vars., Waltheria ovata, Cav., and 

 Evolvidus ahinoides, L. var. 



From Table I, reviewing the exploring expeditions which have done 



