CONTENTS 
VARIATION IN ASTER. 
SPECIFIC LIMITS IN ASTER 
General Distribution of Aster-species 
Variation within the species 
Variation between the species 
Reasons for intermediate forms 
Specific rank 
Inclusive descriptions 
Treatment adopted for subspecies, forms, hybrids, types, sub- 
generic groups, etc. 
NORMAL CHARACTERS 
Coincident Leaf-forms 
Consecutive Leaf-forms 
InBorescence Stages. ces LU. ol a MU Eae eU es pe im di cta dbd 
Sylvanism and other sources of change 
Variability of Aster seedlings and of root-propagated plants ......... 
COMPARATIVE VARIABILITY OF ORGANS 
Colony-forming Characters 
Color-characters 
Pubescence 
Glands 
Fragrance 
Sinus-characters 
Teeth of the leaf-margin 
Texture 
Veins 
Wings 
Bract-characters 
Inflorescence development and corolla characters 
Plasticity of characters 
Primordial leaves as possible phylogenetic clues 
MODERN SYSTEMATIC TREATMENT OF ASTER. 
SKETCH OF THE LATER HISTORY OF ASTER 
Recognition of Segregate Genera 
Brief Bibliography for American Asters 
Table of Increase in Recognized Species 
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