The photo above shows the double involucre
of the wild filbert or hazelnut as seen along Road K6000 just above Hellroaring
Ditch on the southeastern flanks of Mt. Adams...........June 12, 2005. The nut develops in the broad sac at the base of the involucre.
The photo at left shows a close-up of the leaf
of filbert as seen at Snowking SnoPark along forest road #82.........May
28, 2005. Note the pinnate venation on the simple leaf blade and numerous serrations
along the leaf margin. This species may sometimes be misidentified as an
alder. The photo at right shows a leaf and involucre
of the wild filbert or hazelnut as seen along Road K6000 just above Hellroaring
Ditch on the southeastern flanks of Mt. Adams..........June 12, 2005.
Single, pendant male catkins and a close view of a female flower of our native filbert as seen along the old Haul Road along the west bank of the Klickitat River several miles north of Washington Highway 242, Klickitat County, WA.....March 17, 2025.
Mature fruits of filbert as seen along the Stagman Ridge Trail #12, Mount Adams Wilderness......August 9, 2021.
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