13 



range of lemon gum is restricted by the susceptibility of the tree to 

 injury from moderate frost. It is not suitable for planting upon the 

 lower levels of the valleys. It is moderately drought resistant, 

 however, and grows thriftily upon many dry upland situations. 

 Lemon gum makes slightly more rapid growth than sugar gum. The 

 timber is strong and moderately durable. The straight, clear form 

 recommends the tree for commercial planting. 



GRAY GUM (Eucalyptus tereticornis). 



Gray gum has a wide planting range on account of its ability to 

 endure considerable drought and cold. It grows less rapidly than 

 blue gum, but it furnishes a strong, valuable timber and develops a 

 clear straight bole suitable for commercial purposes. The wood is 

 moderately durable in contact with the soil. 



OTHER EUCALYPTS. 



Both red gum (Eucalyptus rostrata) and manna gum (Eucalyptus 

 viminalis) have been recommended for commercial planting in Cali- 

 fornia and have been grown to a limited extent. Both species will 

 stand considerable drought and cold, and they may be grown suc- 

 cessfully in situations unsuitable for the blue gum and the sugar gum. 

 They grow rapidly and furnish strong timber. Both species yield 

 good fuel wood, and red gum timber is moderately durable in contact 

 with the soil. These species can not be so strongly recommended 

 for commercial planting as those previously described, because 

 they possess a strong tendency to irregular growth and develop a 

 form unsuitable for merchantable timber. 



[Clr. 59] 



