44 
Explanation of the plate 
(Tavle I). 
Fig. 1. Old corymb of H. excellens. 
— 2. Young corymb of the same. 
3. Scape with terminal head of H. pilosella. 
4. Corymb of H. aurantiacum. 
— 5. Corymb of H. excellens x aurantiacum, g. 
6. H. excellens X pilosella, 2. 
TIME. pilosella x aurantiacum. 
8. Female head of a form of H. pilosella. 
All the main figures are natural size; the detail-figures which give 
the form of the outer flowers of each plant are magnified twice. 
