<jats:p> A new alkaloid, C<jats:sub>18</jats:sub>H<jats:sub>28</jats:sub>ON<jats:sub>2</jats:sub>, designated flabelline, has been isolated by countercurrent distribution from the extract of Lycopodium flabelliforme. The structure and stereochemistry of flabelline have been established by its conversion to and preparation from lycopodine.