RHODOKA. — 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 sup- 

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 Address manuscripts and proofs to 



B. L. ROBINSON, 3 Clement Circle, Cambridge, Mass. 

 Subscriptions, advertisements, and business communications to 



W. P. RICH, 300 Massachusetts Avenue, Boston, Mas*. 



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E. L. RAND, Corresponding Sec'y N. E. Botanical Club, 



1052 Exchange Building, Boston, Mass. 

 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 and 

 Howard W. Preston. Price 40c. net. Preston & Rounds 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 

 centers of botanical activity. Issued quarterly, at $22.60 per 101)0 

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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 

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Vol. I. 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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