All the tallest trees are evergreen: Sequoia sempervirens: 115m Pseudotsuga menziesii: 99m Eucalyptus regnans: 97m Picea sitchensis: 96m Sequoiadendron giganteum: 95m Presumably because the equable conditions that allow for really tall growth also allow for easy all-year leaf retention. The tallest deciduous tree I can think of is Larix occidentalis, with the tallest currently known being 58.5m tall (Gymnosperm Database: http://www.conifers.org/pi/la/occidentalis.htm ), and reported (unverified!) to 65m or even 80m in the past. Interestingly, like most of the tallest evergreen trees, a conifer. Can anyone think of any other taller deciduous tree? And what is the tallest deciduous Angiosperm tree? Tallest I can find info for is Liriodendron tulipifera at 54m (Eastern Native Tree Society).