— 241 



full fruits. Of the other hybrid (No. 46, 1), which I did not see 

 when flowering, the fruits were collected, but among 805 only 59 were 

 apparently full and have given three plants, which probably will flower 

 next year (No. 141). Another hybrid (No. 46,4) is hermaphrodite 

 and not very far off H. aurantiacum, but still with more of H. excellens ; 

 it is also better in its vegetative parts; it is painted in the 

 Plate as fig. 5. It flowered again in September, when the drawing 

 was painted, and some of its heads were isolated, others castrated ; 

 unfortunately it did not survive the winter. Of the fruits from 

 castrated heads of it 82 were empty, 68 apparently full (No. 144) ; 

 of them from isolated heads 318 were empty, 160 apparently full 

 (No. 143). They were sown in the spring of 1906 and have ger- 

 minated to some extent (38 plants). Two hybrids are nearer to 

 H. excellens; they have copious stolons and are vigorous in all 

 vegetative parts as well as in rich-flowered corymbs. The flowers 

 are female as in H. excellens, from which they differ in a orange- 

 red stripe on the under-side of the corollas of the outer flowers, 

 and in the darker hairiness of the involucres and the stalks. The 

 one of these two (No. 46,3) has given fruits after isolation; they 

 were sown, and have germinated in September 1905 (No. 107), 

 but only a single plant has come from them. The last hybrid 

 (No. 46, 2) is very near to H. excellens and is perhaps only a pure 

 H. excellens ; not-isolated fruits germinated in 1905 and were planted 

 out in 1906 (No. 142). — At present only the following primary 

 hybrids are alive: 1° a hybrid certainly, but near excellens, (No. 46,3), 

 2° a plant which is so near excellens, that it is doubtful if any 

 hybridisation has taken place (No. 46, 2), and 3° a plant which 

 hitherto has not flowered (No. 46, o). 



Series IV (H. excellens x aurantiacum). 



A specimen of H. excellens, planted in a pot, was placed in 

 a cold-house. June 16 th 1904; after removing the opened flower- 

 heads some buds were castrated. June 17 th ; two heads, opened 

 to day, were fertilized with H. aurantiacum taken from a lawn in 

 the Garden near the Observatory (No. 48). Harvest, sowing and 

 planting as in the foregoing Series III. The offspring of the castrated 

 heads was of course typical H. excellens (No. 47), of which a single 

 plant is kept alive. Among the plants, growing from the cross, 

 only one was not a pure H. excellens. This hybrid (No. 48 a) is 

 a very robust plant with strong stolons, large radical leaves and 

 tall and many-flowered corymbs. The heads are a little larger 



Botanisk Tidsskrift. 27. Bind. \Q 



