Corylus colurna *
(KO-ril-us ko-LURN-a)
Also known as Turkish Hazel
Male catkins on Turkish filbert tree
Considered a possibility for "difficult sites", this tree will tolerate drought and alkaline soil, but does best in well-drained soil with lots of sun.    It received the Royal Horticultural Society's Award of Garden Merit in 1993.
This slow-growing broadleaf deciduous tree can attain 35-50 feet, usually with a short trunk, a broad pyramidal symmetrical shape, and small horizontal limbs. 
Filbert catkins
It bears male and female flowers on the same plant. The pendulous male catkins grow in groups of 2 - 5 and this particular tree is absolutely loaded with them!
The female flowers are small and inconspicuous. The resulting fruit is a delicious hazelnut or filbert.
Native to southeast Europe and western Asia.
Location on campus:
On the northeast corner of Arbuthnot Hall
* Information from Oregon State University's Landscape Plants web site.