The term “Alliance” is used to describe a group of genera that have many common characteristics
and can be used for cross breeding.
In the Annual Show, the plants are classed and judged according to their alliance,
and “Best of Alliance” awards are given. The Vanda Alliance is split into two for
convenience, because of the large number of Phalaenopsis entries. The table at the
right shows the alliances used in the Ottawa Orchid Society Show.