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2 FIELDIANA: BOTANY, VOLUME 28
flora of Roraima, (3) flora of Ptari-tepui' and adjacent Sororopa'ntepui'and
Carrao-tepui' which are extensions of Ptari-tepui^ (4) flora
of Cerro Turumiquire and adjacent Oriente region, which includes
the Cordillera de la Costa in the states of Sucre, Anzoategui, and
Monagas, and (5) miscellaneous species of the Andes of Venezuela
in the states of Lara, Trujillo, Merida, and Tachira. The families
of cryptogams and phanerogams (with the exception of Algae, Lichens,
mosses, and Podocarpaceae) have been arranged in this order.
The style of treatment has been made to conform as much as possible
with that found in the report by Gleason and collaborators on
the "Botanical Results of the Tyler-Duida Expedition," published
in The Bulletin of the Torrey Botanical Club 58: 277-506 (193D, and
in that by Maguire and collaborators on "Plant Explorations in
Guiana in 1944, Chiefly to the Tafelberg and the Kaieteur Plateau, "
in the same journal, 75: 56-115, 189-230, 286-323 (1948). In order
to facilitate the assembling and correlation of data from Duida, the
same subdivisions of "lowland species" and "species of Mount
Duida" have been continued. In the present treatment "lowland
species" refer to all collections made in the Territorio Federal
Amazonas between Puerto Ayacucho and the base of Mount Duida by
Steyermark, and those made along the Rio Negro and Rio Guainia by
Mr. Llewelyn Williams, while "species of Mount Duida" include all
those made on the slopes or summit of that cerro. As regards locality
names, the same ones have been followed as were used by Tate
for Mount Roraima, by Tate and Hitchcock for Mount Duida, and by
the Phelps expedition for Ptari-tepui' This has been done mainly in
order to conform to existing published locality names, in the interest
of clarity. Mount Ptari-tepuf lies in the southeastern portion of
Venezuela in the state of Bolivar, 130 kilometers northwest of Mount
Roraima and 65 kilometers to the east of Mount Auyan-tepuf, and in
5 45 T N. Lat., 6l45 T W. Long. Its extensions include Sororopantepuf"
and Carrao-tepui' in the same latitude and longitude, all of
them situated on that part of the mesa of the Gran Sabana in the
vicinity of the Mission of Santa Teresita de Kavanaye'n. Ptari-tepu/
and its extensions represent one of the "northernmost extensions of
the Guiana highlands in the watersheds of the Carom' and Paragua
rivers." 1
The author is greatly indebted to the various collaborators for their
contributions of the particular groups or families which they studied
in connection with this report. To the curators of the New York
Botanical Garden, Gray Herbarium, and United States National Herbarium
the author is greatly indebted for the loan of critical material
used in connection with the study of specimens.
Finally, I wish to express my deepest gratitude and appreciation
to the many persons in Venezuela who have helped to facilitate my
Dimmer, J. T. and Phelps, W. H., Am. Mus. Nov., no. 1270: 9. 1944,
and no. 1274: 1-9. 1945.