22 BROOKLYN BOTANIC GARDEN MEMOIRS 
are those of Von Rohr and of Ryan, made about 1780, and preserved 
for the most part in the herbarium of the Botanical Museum at Copen- 
hagen, where the most complete and extensive collections from these 
islands are to be found. 
Prior to 1800 collections were made by L. C. M. Richard, Isert, 
West, Pflug, Ledru and Riedlé. During the nineteenth century the 
principal collectors were Benzon, Bertero, Ravn, Hornbeck, Ehren- 
berg, Breutel, Krebs, Oersted, Holton, Eggers, Krause, Warming, 
Borgesen, Paulsen, A. E. Ricksecker, Mrs. J. J. Ricksecker, Otto 
Kuntze and Millspaugh. Since 1900 collections have been made 
by N. L. Britton, Mrs. Britton, J. F. Cowell, Miss Marble, J. A. Shafer 
and J. N. Rose. 
A collection made by Kirkman Finley in Trinidad was erroneously 
labeled as from St. Thomas, and many errors have been made in citing 
these specimens. A few plants collected by Kuntze in Porto Rico 
have been erroneously recorded as from St. Thomas, and many col- 
lected by Riedlé on Porto Rico have been similarly erroneously re- 
corded. Conversely, some plants collected by Purdie on St. Thomas 
have been cited as Jamaican. 
For the purposes of the following list of plants I have examined 
the literature and have studied the following series of specimens: 
1. Duplicates of plants collected by Benzon, Hornbeck, Eggers 
and Paulsen, received by the New York Botanical Garden in exchange ~ 
with the Copenhagen Botanical Museum. 
2. The collection made by I. F. Holton on St. Thomas; preserved 
in the herbarium of Columbia University. 
3. Dr. Otto Kuntze’s St. Thomas plants, which came to the New 
York Botanical Garden as a part of his herbarium, presented by Mr. 
Andrew Carnegie. 
4. The St. Croix soliectme made by Mr. Ricksecker and a portion 
of that made by Mrs. Ricksecker in the herbarium of the New York 
Botanical Garden and parts of the complete sets preserved in the 
herbarium of The Field Museum of Natural History. 
5. Part of the St. Thomas collection made by Dr. Millspaugh. 
6. The St. Croix collection made by Mr. Cowell and myself in 1900. 
7. The collections made by Dr. Rose, assisted by Mr. Fitch and 
Mr. Russell on St. Croix in 1913. 
8. The collection made on St. Thomas by Mrs. Britton and Miss 
Marble in 1913. 
9. The collection made by Dr. Shafer and myself on St. Thomas, 
St. Jan and small adjacent islands in 1913. 
Mrs. Britton has contributed the catalogue of the mosses, Dr. 
Evans that of the hepatics, and Professor Riddle that of the lichens. 
