CONTENTS 
PAGE 
Work of previous investigators SO 
General considerations 05 
Classification material 96 
Morphology of the oats plant 97 
The caryopsis 97 
Basilar connection of the grains 97 
Hairs of the grain 99 
Hairs of the lemma 99 
Hairs of the callus 100 
Hairs of the rhachilla 101 
Form of the rhachilla 101 
Nerves of the glume and the lemma 102 
The awn \ 103 
Form of the grain 104 
Color of the grain 1 05 
Dimensions of the grains 107 
Double-grains 108 
The spikelet 109 
Attitude of spikelets 109 
Number of grains in spikelet 109 
Maturing period 112 
Color of glumes at maturity 112 
Physical properties of graini 113 
The panicle 114 
Form of the panicle 114 
Therhachis 116 
The leaves 117 
The ligule and the auricle 1 18 
The sheath 120 
The culm 120 
Pubescence at the nodes. 121 
The roots 121 
Habit of plant in early growth 121 
Color of young plant 122 
Summary ; 123 
Classification of groups 125 
A vena nuda 125 
A vena sterilis 126 
A vena abyssinica 130 
A vena strigosa and A vena brevi.3 130 
A vena fatua 131 
A vena sativa 132 
Avena sativa orientalis 154 
Conclusion 162 
Acknowledgments 163 
Bibliography 163 
Index to variety descriptions : 169 
81 
