Original: It is an evergreen tree , and it is the tallest of the eucalypts , growing to 70 -- 100 m ( 230 -- 330 feet ) , with a straight , gray trunk , smooth-barked except for the rough basal .
Simplified: The flowers are in groups of 9-15 together , each flower about 1 cm ( 0.5 in ) diameter with a ring of many white stamens .