112 Rhodora [JUNE 
chosen field, e. g., Flint, W. F., New Hampshire grasses. II. Those 
works which merely enumerate, with or without notes, certain selected 
species of a particular area, making no pretension to be exhaustive or 
even to cover completely any especial family. The first category can 
be subdivided into four classes of works, viz., (a) Descriptive manu- 
als, e. g., Farlow, W. G., Marine Algae of New England, containing 
diagnoses of the plants they mention; (4) annotated catalogues, e. g., 
Dame and Collins, Flora of Middlesex County, in which the scientific 
names are accompanied by remarks upon occurrence, habitat, season 
of flowering, or other notes including perhaps occasional diagnoses; 
(c) lists or mere enumeration of species without significant notes or 
descriptions; (Z) keys, e. g., Knobel, E., Ferns and evergreens of 
New England, in which, with little or no descriptive text a brief deter- 
minative synopsis is given. Works of the second category may be 
generally divided into (+) those in which the selected species receive 
a technical or scientific treatment, e. g., Setchell, W. A., Notes on some 
Cyanophyceae of New England ; and (7) those in which the treatment 
is popular, e. g., Bailey, W. W., New England wild flowers. In order 
to give as briefly as possible a clue to the nature of the papers enumer- 
ated these six classes are indicated by the following condensed expres- 
sions: Descr. manual, Annot. catalog., List, Key, Select. spec., technic. 
treatm., Select. spec., popular treatm. 
It was hoped to include in the present catalogue mentions of local 
floras now in preparation, but as most authors have shown a natural 
reluctance to announce beforehand undertakings which they may not be 
able to complete, it has seemed best to omit this feature of the work. 
It has also been found impracticable to state prices and sources of 
supply, since with few exceptions the floras here mentioned have long 
been out of print and can only be picked up at second hand. 
All but seven of the papers here enumerated have been personally 
examined by the compiler. Where no other library is mentioned the 
work is to be found in the Library of the Gray Herbarium of Harvard 
University, Cambridge, Mass. The following abbreviations indicate 
the other libraries where particular papers may be consulted: H. C., 
Harvard College; N. H., Boston Society of Natural History ; M. H., 
Massachusetts Horticultural Society; B. P., Boston Public Library ; 
B. A., Boston Athenaeum ; E. I., Essex Institute, Salem. 
'The writer cordially acknowledges assistance from various members 
of the New England Botanical Club, who by suggestions and informa- 
