2 \W EISS, /uve7iz7e Flowering in Eucalyptus globulus. 



though the juvenile foliage in these plants is generally 

 restricted to the seedling stage of the plant.' A more 

 strictly analogous though less striking difference can be 

 seen in the case of the immature and mature foliage of 

 the Holm Oak (Queirus Ilex). 



The flowering of EucalypUis globulus is usually re- 

 stricted to branches possessing the mature foliage and 

 does not normally commence until the tree has assumed 

 considerable dimensions. I have however had under 

 observation two interesting cases of young trees, which 

 flowered at an early age and while still clothed with the 

 immature foliage. The first of the two plants, growing in 

 a six-inch pot, was cut down after its first year's growth 

 to the height of about two feet. One of the lateral buds 

 then became a leader, and growing some two feet in 

 length produced, towards the end of the second summer, 

 a number of flower buds in the axils of five pairs of leaves 

 of perfectly normal type, typical of the young plants, i.e., 

 broad and rounded at their base and devoid of any trace 

 of leaf stalk. Most of these flowers expanded next 

 summer, i.e., in the third year of the tree's growth. They 

 were well formed and produced ripe pollen ; but though 

 several flowers were fertilised and showed some further 

 development of the ovary, no ripe seeds were produced. 



Several plants which had been growing for many years 

 in the same greenhouse and which had attained much 

 greater dimensions showed neither any sign of mature 

 foliage nor flower buds. Even the oldest which has 

 occasionally produced branches with pendant leaves has 

 never formed flower buds. 



It may therefore be that the severe interference with 



' Pritzel has, however, described one species of Acacia {Acacia insolita) 

 which, in its mature condition, possesses both pinnate leaves and phyllodes. 

 Engler's Botaii. Jahrb., XXXV., 1904, p. 311. 



