Page authors: Don Knoke, David Giblin
Butomus umbellatus
flowering rush
WTU specimens
Other herbaria

Distribution: Whatcom County in Washington. Introduced across the northern United States from Washington to Vermont.

Habitat: Occasional in ponds and wetlands.

Flowers: August

Origin: Introduced from Eurasia

Conservation Status: Not of concern

Description:
General:

Plants of fresh water, the stems to 150 cm. long.

Leaves:

Leaves linear, to 2.7 m. long, the blade triangular at the base, submersed, emersed or floating.

Flowers:

Inflorescence an umbel with 20-25 flowers on a triangular scape up to 150 cm. long; bracts 3, subtending the umbel; pedicles 4-10 cm.; flowers 2-2.5 cm. wide; outer 3 tepals elliptic, 6-7.5 mm. long and 2-2.5 mm. wide; inner 3 tepals oblanceolate, 9-11.5 mm. long and 4.5-6 mm wide; tepals light purple with darker purple veins; stamens 3 pairs opposite outer tepals and 3 opposite inner tepals; pistils pink.

Fruits:

Follicles leathery, 1 cm. long.

Accepted Name:
Butomus umbellatus L.
Publication: Sp. Pl. 1: 372. 1753. 1753.

Synonyms & Misapplications:
Butomus junceus Turcz.
Butomus umbellatus L. f. vallisneriifolius (Sagorski) Glnck
Additional Resources:

PNW Herbaria: Specimen records of Butomus umbellatus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Butomus umbellatus checklist entry.

E-Flora BC: Butomus umbellatus atlas page.

CalPhotos: Butomus umbellatus photos.

USDA Plants: Butomus umbellatus information.

16 photographs:
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