State Boaku of Foukstry. 299 



to grow. It is propagated either from the seed or from seedlings. 

 Where the ground can not be cultivated it is recommended that 

 the trees be spaced 4x4 to 5x5 feet, and where the trees are to be 

 cultivated they should be plant(Ml about 7x7 feet, and undercropped 

 with corn for two or three years. The locust is not a shade endur- 

 ing tree, so natural pruning is effective. However, it is recommended 

 that the trees be gone over annually for three to five years and that 

 very strong lateral branches be removed, and if the tree forks, that 

 one part be removed. Wounds on the locust heal readily. Under 

 good conditions the trees will attain a single post size in about 4 

 to 6 years, depending on the quality of the soil and the distance 

 apart the trees are planted. This tree has a mortal enemy in the 

 locust borer, and the planting of the tree for commercial purposes 

 should be confined to the southern counties where it is not seriously 

 damaged by this pest. 



SIMAROUBACE^. The Quassia Family. 

 AILANTHUS. Tree of Heaven. 



Ailanthus glandulosa Desfontaines. Stink Tree. Tree of 

 Heaven. Plate 107. Bark gray, thin, rough or fissured on old 

 trees, smooth on the branches and young trees; twigs very robust, 

 at the end of season a glossy light brown; leaves spiral on the 

 branches, odd-pinnate, 3-10 dm. (12-40 inches) long; leaflets 13-41, 

 margins entire or with few teeth, drawn to a long point; flowers 

 appear in June, in large terminal panicles, the staminate flowers 

 emit an offensive odor; fruit numerous, twisted and broadly winged, 

 about 1 cm. {^ inch) wide and 4 cm. (IJ^ inches) long, the single 

 seed near the center. 



Distribution. Introduced from Asia. Now well established in 

 many parts of Indiana. It is generally regarded as a weed tree on 

 account of the rapidity and certainty with which it spreads from 

 the seed scattered by the wind. 



The published records of the distribution are as follows: Clark 

 (Baird and Taylor) ; Delaware, Jay, Randolph and Wayne (Phinney) ; 

 Fayette (Hessler); Franklin (Meyncke); Hamilton (Wilson); Jeffer- 

 son (J. M. Coulter), (S. Coulter) and (Young); Kosciusko (Chip- 

 man); Marion (Wilson); Monroe (Blatchley); Vigo (Blatchley). 



Additional records are: Putnam (Grimes); Decatur and Wells 

 (Deam). 



Horticultural value. Adapted to all kinds of soils and all kinds 

 of conditions. No tree will endure more abuse. Very ornamental 



