Butomaceae - flowering rush family

Gerald A. Mulligan
Research Scientist and Research Institute Director (retired) and presently Honorary Research Associate, Agriculture and Agri-Food Canada,
Ottawa, Ontario K1A 0C6, Canada

Awarded the George Lawson Medal by the Canadian Botanical Association in 2006.
Awarded the Faculty of Macdonald, McGill University, Most Distinguished Alumni Award on October 18, 2014.
Read his biography "The Real Weed Man" available in print and ebook.

Butomus umbellatus L., flowering rush, butome ombelle
Flowering rush is a perennial aquatic herb, with fleshy rhizomes, that grows 1 to 1.5 meters (3.3 to 5 feet) high. It can tolerate a water level up to 2 meters (6.5 feet) deep. It was introduced into this Continent from east Asia as an ornamental plant, and it is now found along the fresh water shores of lakes, ponds, and riverbanks in all northern States and in all provinces except Saskatchewan. Where present, it has the potential to be an invasive species displacing native riparian vegetation and presenting a serious obstacle to boat traffic. It was reported for the first time in North America at Laprairie Quebec in 1897 and by 1935 Marie-Victorin considered it to be the most dominant aquatic monocotyledon in the Montreal area. It continues to be spread by garden plantings and by other movements of plant fragments and seeds.

Click on a photo to view an enlarged image.
Weed Name Photo Weed Name Photo
flowering rush, butome ombelle flowering rush, butome ombelle
(flower head)
flowering rush, butome ombelle
(in fruit)
Number of Visitors: