North American Flora 
HIS work is designed to present descriptions of all plants growing 
r independent of cultivation, in North America, here taken to include 
Greenland, Central America, the Republic of Panama, and the 
West Indies, except Trinidad, Tobago, and Curacao and other islands off 
the north coast of Venezuela, whose flora is essentially South American. 
It will be published in parts at irregular intervals by the New York 
Botanical Garden through the aid of the income of the David Lydig Fund 
number of points. 
with the following sequence: 
Volume 1. Mycetozoa, Schizophyta, Diatomaceae. 
i. 
Volumes 11 to 13. Algae. 
Volumes 14 and 15. Bryophyta. 
Volume 16. Pteridophyta and Gymnospermae. 
Volumes 17 to 19. Monocotyledones. 
Volumes 20 to 30. Dicotyledones. 
The preparation of the work has been referred by the Scientific Direc- 
tors of the Garden to a committee consisting of Professors L. M. Under- 
wood and N. L. Britton 
Professor George F. Atkinson of Cornell University, Professors Charles 
R. Barnes and John M. Coulter of the University of Chicago, Mr. Fred 
erick V. Coville of the United States Department of Agriculture, Pro- 
fessor Edward L. Greene of the United States National Museum, Pro- 
fessor Byron D. Halsted of Rutgers College and Professor William Tre- 
1 
lease of the Missouri Botanical Garden have consented to act as an advis- ° 
ory committee. 
Each author will be wholly responsible for his own contributions, 
being restricted only to the general style adopted for the work, whic 
must vary somewhat in the treatment of diverse groups 
The subscription price is fixed at $1.50 for each part ; it is expected 
that four or five parts will be required for each volume. A limited num- 
ber of separate parts will be sold at $2.00 each. Address, 
THE NEW YORK BOTANICAL GARDEN 
BRONX PARK, NEw YORK CITY 
Volume 7, Part 1, Ustilaginales, including Ustilaginaceae and Tilleti- 
aceae, by G. P. Clinton, was issued Oct. 4, 1906. 
ol, 7, Part 2, Coleosporiaceae, Uredinaceae and Aecidiaceae (pars), 
of the Uredinales, by J. C. Arthur, was issued March 6, 1907. 
ume 22, Part 1, including Podostemonaceae by George V. Nash, 
Crassulaceae by N. L. Britton and J. N. Rose, and Penthoraceae and 
Parnassiaceae by P. A. Rydberg, was issued May 22, 1905. 
ume 22, Part 2, including Saxifragaceae and Hydrangeaceae by J: 
K. Small and P. A. Rydberg, Cunoniaceae, Iteaceae and Hamamelidaceaté 
; N. L. Britton, Pterostemonaceae by J. K. Small, Altingiaceae by Percy 
Wilson and Fhyllonomaceae by H. H. Rusby, was issued Dec. 18, 1905+ 
