RHODOR A.—A monthly journal of botany, devoted primarily to the flora of New 
England. Price, $2.00 per year, postpaid (domestic and foreign); single copies 
(if available) 20 cents. Volumes 1-8 or single numbers from them can be supe 
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and short scientific papers, relating directly or indirectly to the plants of the 
northeastern states, will be gladly received and published to the extent that the 
limited space of the journal permits. Forms will be closed five ks in ad 
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Address manuscripts and proofs to 
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Entered at Boston, Mass., Post Office as Second Class Mail Matter. 
KEY TO NEW ENGLAND TREES, Wild and Commonly Cultivated 
based primarily upon leaf characters, by J. FRANKLIN COLLINS an 
Howarp W. Preston. Price 40c. net. Preston E RouNps Co., 
Providence, R. I. 
CARD-INDEX OF NEW GENERA, SPECIES AND VARIETIES OF 
AMERICAN PLANTS, 1885 TO DATE. 
For American taxonomists and all students of American plants the 
most important supplement to the Index Kewensis, this catalogue 
in several ways exceeds the latter work in detail, since it lists not 
only the flowering plants, but pteridophytes and cellular crypto- 
gams, and includes not merely genera and species, but likewise sub- 
species, varieties and forms. A work of reference invaluable for 
larger herbaria, leading libraries, academies of sciences, and other 
— of botanical activity. Issued quarterly, at $22.50 per 1000 
cards. 
GRAY HERBARIUM of Harvard University, 
Cambridge, Mass., U. S. A. 
CHECK LIST OF GRAY'S MANUAL, 7th EDITION, compiled by 
M. A. Day. Leatherette. Pocket size. Invaluable for collector's 
memoranda and herbarium records. Published and sold by the 
Gray HERBARIUM, Cambridge, Mass. Price postpaid 20 cts. each. 
Ten copies $1.50. 
MEMOIRS OF THE GRAY HERBARIUM. A series of illustrated 
quarto papers issued at irregular intervals, sold separately. — . 
Vol. L Monograph of the genus Brickellia, by B. L. Robinson 
(with 96 text figures effectively illustrating all known species of the 
genus). Feb. 1917. $3.00. 
Gray Herbarium of Harvard University, Cambridge, Mass. 
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