The small tree stump to the left of the felled ash in the photograph was a Large-flowered Cockspur Thorn
Crataegus coccinoides, an American hawthorn and one of only a few in Wanstead Park.
This hawthorn, although self seeded, may be descended from the American Garden which is shown as a feature on some old plans of the Wanstead Parklands.
There may be one or two seedlings of this species remaining - a mature tree exists elsewhere in the Park (
photo) - but at least two other mature specimens are known to have been cut down at previous times.