From a distance, your attention might not be grabbed by this willow oak growing between the courtyard of 114 19th Av.S. and the parking lot. It's height of 23 m (75 ft.) is respectable, but its crown spread of 18 m (59 ft.) isn't that remarkable. What is amazing about this tree is its diameter of 154 cm (61 in.). It's difficult to get a precise measurement of its diameter due to the mass of ivy clinging to the trunk but it appears to be the "fattest" tree in the arboretum, beating out even the giant Bicentennial oak by a few cm. The ivy makes it difficult to tell for sure, but it may be that the cause of this massive girth is that two smaller trees growing close together merged trunks long ago. In any case, it's worth taking a look at this unusual tree!