1920.] NATURAL SCIENCES OF PHILADELPHIA. 141 



and — more imperfect— certain series of specimens made in southern 

 Colombia by F. C. Lehmann and at widespread stations over the 

 country by Jose Triana. To the custodians of the herbaria which 

 have loaned me specimens, the United States National Museum, Gray 

 Herbarium, and Field Museum of Natural History, as well as to my 

 colleagues at The New York Botanical Garden, I am under obligation. 



Also, I would mention my indebtedness to that group of Colom- 

 bian workers whom I had the privilege of meeting in 1917, the 

 growth of whose museum at Bogota has been phenomenal. Es- 

 pecially would I thank Brothers Ariste-Joseph and Ydinael, Her- 

 manos Cristianos of the Universidad de La Salle. A further word 

 of appreciation must be given to Sr. Santiago Cortes of Bogota, 

 who, working long alone, has been able to give to the world only 

 the first -volume of his "Flora de Colombia." 



The following study is primarily systematic, and keys are given 

 throughout. New species and those seen by the writer are care- 

 fully described. Synonomy for Colombia is cited fully, otherwise 

 only those names are included which are of first descriptions of 

 Colombian species. The original statement of distribution, or of 

 type-specimen is quoted, and the effort is made to firmly estab- 

 lish the nomenclature used. But it must be said that, as most of 

 the types are in Europe and inaccessible to me, and as Colombia's 

 flora is as yet very partially known, we cannot be certain of the 

 identity of some of these. But I believe that, with very few excep- 

 tions, the names now used will be permanent. 



For each species a statement of environment and distribution 

 is given, the latter made as definite as our knowledge permits, and 

 analysed accordingly to life zone and Cordillera. Lastly is given 

 a list of specimens seen, these grouped under the Departments which 

 at present (1920) are in force. State-outlines in Colombia have 

 been so shifting that these limits have not always been easily ascer- 

 tainable. The herbaria in which specimens may be consulted are 

 indicated by the symbols: 



A — The Academy of Natural Sciences of Philadelphia. 



C — Field Museum of Natural History, Chicago, 111. 



H — Gray Herbarium of Harvard University, Cambridge, Mass. 



U— United States National Museum, Washington, D. C. 



Y — New York Botanical Garden, Bronx Park, New York City. 



My own collections may all be consulted at The New York Bo- 

 tanical Garden. Duplicates are being distributed to many her- 

 baria. 



