EXPLANATION OF PLATES 



PLATE 36 

 Crepis seedlings. X 2. 



Fig. 1. Crepis tectorum. Normal seedling showing elongated cotyledons 

 extending horizontally from the center. Note the two plumule leaves at right 

 angles to the cotyledons. 



Fig. 2. Crepis capiUaris. Normal seedling showing short rounded cotyledons 

 extending horizontally, one plumule leaf showing at right angles to the 

 cotyledons. 



Fig. 3. Fi hybrids, C. tectorum 5 X C capillaris f^ (above). F, hybrids, C. 

 capillaris $ X C tectorum ^ (below). Seedlings show stage at which develop- 

 ment ceases. 



Fig. 4. Selfed seedling resulting from crossing method No. 2. Note the 

 roundish C. capillaris type of cotyledons (marked c) not at all like those of the 

 Fj hybrids. Five plumule leaves are shown, the plant being the same age as 

 the hybrids. 



Fig. 5. F, hybrid seedling produced by crossing method No. 2. Notice the 

 two small abnormal plumule leaves between the cotyledons. This shows the 

 highest stage to which any of the hybrids developed. 



[200] 



