APPENDIX III. 
————>_——— 
THE DETERMINATION OF ONE HUNDRED SEED 
PLANTS OF NORTHEASTERN UNITED STATES. 
Tuis scheme for determining the names of a hundred of the 
more common and conspicuous plants of the northeastern por- 
tion of the United States is based primarily upon the great 
natural plant societies, and secondarily upon the size and gen- 
eral life duration. The remaining characters chosen are such 
as the student would most naturally and readily observe. 
While the key is largely artificial, yet it is hoped that the 
determination of a plant by its assistance will acquaint the 
student with it, not merely as a specimen for laboratory work, 
but asa living thing, having certain definite life relations. 
Jt is urged that this determinative work be preceded, as far as 
possible, by intelligent field work. 
The key is largely self-explanatory, but for the sake of 
brevity, the following abbreviations have been introduced : — 
= parallel veins; if this sign is absent the leaf is under- 
stood to be netted veined. 
jis., flowers; st., stamens; p., pistil; reg., regular; irreg., 
irregular; lvs., leaves ; lus. rad., leaves all apparently from the 
root (a short stem); dvs. com., leaves compound; pi., 3-foliate 
leaves pinnately compound of three leaflets; pa., 3-foliate 
leaves palmately compound of three leaflets; 3m. 4m. 5m., 
three, four, or five sepals, or petals, referring to the petals gen- 
erally. The Genus is the first part and the Species is the 
second part of the scientific name. 
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