Alternately, use the Dragon Circle in the Great Divide if you are under level 92 and have not completed the access quest for Obol Plains.
The quest may not update if you traveled to Vesspyr Isles by any other method.
Update: 01/20/2014 - Quest did update when traveling to VI via guild druid portal.
Search for signs of where Ethan went.
Talk to Roy at ( 169, 188, -151 ) Copy/waypoint 169, 188, -151 (Falinpol upper level)
Talk to Claudia at ( 153, 157, -163 ) Copy/waypoint 153, 157, -163 (Falinpol lower level)
Find Vesspyr Willows for Claudia.
Note: These can be found anywhere along the edge of each island. These locations are only representative of possible places to look. Recommend using the "Track Harvestables" ability to help find the Vesspyr Willows.