Silver Dollar Tree
Eucalyptus cinerea
Photographed at Menangai Crater, Kenya. March 2013.
From Wikipedia:
Commonly known as the Argyle apple or silver dollar tree, this eucalyptus is
small to medium sized, with rough bark, persistent on the trunk and larger
branches, thick, fibrous, longitudinally furrowed, reddish-brown to grey-brown.
Trees are usually mature in the juvenile leaf phase but can often produce
intermediate and adult leaves which are stalked, broad-lanceolate to 11 x 2cm,
concolorous, greyish-blue and glaucous. White flowers appear in mid spring to
early summer.