Magnolia campbellii is a medium-sized to large deciduous tree growing to 30 m, rarely to 45 m, tall, with smooth grey bark.

After opening, the innermost tepals remain erect while the others spread widely.

This arrangement may shelter the stamens and stigmas from rain, snow, and other harsh environmental conditions common during their very early flowering time period.

Hooker named the species after Archibald Campbell, Superintendent of Darjeeling.

Young trees take a long time to reach flowering age and need deep, moist soil and a mild, sheltered site.