A little used gardening term is ‘Remonant’, said of a plant flowering more than once in a season.

I first came across the term in an article ‘Autumn Encore’ by Simon Garbutt in  The Garden September 2003 . The main thrust was on reflowering varieties of Iris, called rebloomer at Seagate Irises.

• Where the growing season is long enough, remonant irises are bred to produce an autumn flush of flowers. In the USA where they are popular they are also known as “Cycle rebloomers”.
• Continious flowering or Repeaters are now being bred to extend the flowering period. The answer to a regular display of Iris is to choose your species and variety with care.

Hydrangea Macrophylla ‘David Ramsey’ is one of the remonant bloomers in the Hydrangea range that is similar to Endless Summer. ‘Blooms age green and red during the summer for an antique look. This one can rebloom in more climates if cut right after first bloom’.Hydrangeas Plus.com

Many perennials are regular rebloomers to the point where they are not worth calling remonant as it is our normal expectation. The exception I would make is the ‘Rose’ or to be more specific some old garden roses that flower either once a year or once in the spring and again in Autumn. By specific variety derived from parenthood some roses are remonant.