12 



yield of 32,000 feet board measure per acre is obtained in thirty years 

 from seedling stands under average conditions. Lumber commands a 

 price of from $100 to $125 per thousand feet in the limited market 

 which it has found in California. Blue gum pile timbers bring from 

 $5 to $15 apiece on the stump. 



SUGAR GUM (Eucalyptus corynocalyx). 



For planting in California sugar gum is one of the most valuable of 

 the commercial eucalypts, on account of its adaptability to situa- 

 tions where many other species will not thrive. 



The shorter and brighter green leaves distinguish this species 

 from blue gum, and the tree develops a more excurrent crown. The 

 young bark is cream colored, and, owing to the flaking off of the 

 older, darker bark, the trunk of the tree has much the appearance of 

 a sycamore. 



The planting range of sugar gum is somewhat restricted by its 

 susceptibility to injury from frost. Young trees will rarely endure 

 greater cold than 25 F., but this species excels other timber eucalypts 

 in endurance of drought. It is adapted to dry uplands, and timber 

 may be raised in dry situations and in the mountain foothills where 

 other eucalypts will not attain merchantable proportions. It is the 

 species to be chosen for planting in situations too dry for the growth 

 of blue gum. 



Sugar gum clears its trunk rapidly of limbs, even when grown in 

 open stand. The characteristic straightness of its stem makes it 

 especially valuable for timber. It is of slower growth than blue gum, 

 but it reaches proportions suitable for merchantable timber. It 

 has been planted only within recent years, but with from ten to fifteen 

 years' growth trees reach diameters of from 12 to 16 inches and 

 heights of from 100 to 140 feet. 



The characteristics of the wood are similar to those of blue gum, 

 but it is straighter grained and easier to split. For fuel wood it is 

 superior to blue gum. The wood is also more durable in contact 

 with the soil than that of most other eucalypts. Green posts last from 

 four to six years, and seasoned timber is even more durable. Sugar 

 gum piles prove more lasting than blue gum. The timber is also 

 superior in strength and is one of the strongest among commercial 

 eucalypts. It is suitable for vehicle stock and for many other uses. 



LEMON GUM (Eucalyptus citriodora). 



Lemon gum is characterized by its clear, straight trunk and by the 

 violet or lavender color of the bark. Its leaves are more delicate 

 and of thinner texture than blue gum. The tree may also be recog- 

 nized by the strong, pleasant lemon scent of the foliage. The planting 



[Cir. 59] 



