APR. 1960 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



10(2): 1-37 



THE BOTANY OF THE GUAYANA HIGHLAND— PART IV 



Bassett Maguire and John J. Wubdack* 

 and Collaborators 



INTRODUCTION 



The return visit to Cerro de la Xeblina in southwesternmost Venezuela, an- 

 nounced in the introduction of Part III of our Guayana Highland reports, was 

 indeed accomplished as there indicated. We returned to New York on 11 February 

 1958, having completed a six-month exploration of Neblina and waterways of 

 the Rio Orinoco-Rio Casiquiare-Rio Negro drainages. During the succeeding 

 March, Venezuela was again visited, so that we might make further aerial survey 

 of the mountain and the region around it. 



Plant collections obtained on these trips were: 



Alto Rio Orinoco, Rio Atabapo, Rio Guainia, Rio Casiquiare, and Rio Paci- 

 moni, Terr. Amazonas. Venezuela, 11 September-15 October 1957; Bassett 

 Maguire, John J. Wurdack and Wm. M. Keith, Jr., Nos. 41428-41923. 



Rio Pacimoni-Yatua, Cerro de la Neblina, and Alto Rio Orinoco, Terr. 

 Amazonas, Venezuela, 16 October 1957-18 January 1958 ; Bassett Maguire, John 

 J. Wurdack and Celia K. Maguire, Nos. 41924-42655. 



We present herewith in Part IV of our report on "The Botany of the 

 Guayana Highland" contributions as follows: Musci by Edwin B. Bartram; 

 Xyridaceae, Marantaceae, Linaceae, and Ochnaceae by Bassett Maguire and John 

 J. Wurdack; Bromeliaceae by Lyman B. Smith; Annonaceae by Robert E. Fries; 

 Butaceae by Richard S. Cowan (with the collaboration of G. K. Brizicky on 

 Spathelia) ; Guttiferae by Bassett Maguire; Aquifoliaceae and Melastomataceae 

 by John J. Wurdack; and Acanthaceae by Emery C. Leonard. Dr. Thomas 

 Morley collaborated in the study of the genus Mouriri. In an accompanying 

 article Dr. Sherwin Carlquist offers his interesting morphological study, "Anat- 

 omy of Guayana Xyridaceae." Dr W. L. Stern and Dr G. K. Brizicky contribute 

 an article on the anatomy of Diomma in the Butaceae. 



* Present address: Department of Botany, Smithsonian Institution, Washington 25, D. C. 



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