CONTENTS. 



PAGE. 



Introduction, 1 



History, 2 



Geographic Distribution, 5 



Economic Value, 5 



Morphology, 6 



Organs of Vegetation, 6 



Flower-axis, 7 



Floral Envelopes, 9 



Stamens, 10 



Pistils and Fruit, 13 



Relationships op the Tribe, 14 



Limitation of Genera, 15 



Limitation op Species, 18 



Key to the Genera, 19 



potentilla, 20 



horkelia, 119 



Stellariopsis, 155 



comarella, 156 



Argentina, 157 



COMARUM, 162 



duchesnea, 164 



Fragaria, 165 



SiBBALDIA, 185 



SiBBALDIOPSIS, 187 



Dasiphora, 188 



Drymocallis, 190 



Chamaerhodos, 205 



Additions and Corrections, 206 



Table of Geographic Distribution, 207 



Index to the Text, 210 



Index to the Plates, 222 



Explanation of Plate I., 224 



Plates, 1-112. 



