Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
50. Butomaceae, The Flowering Rush Family
1. Butomus L. -- Flowering rush
1. Butomus umbellatus L.
Moderately tall, rushlike perennial. Leaves basal, from a stout rhizome,
stiff and erect when emersed or lax and floating in deep water, long-linear,
to 1 m long, 5-10 mm wide. Inflorescence a many-flowered umbel borne
on a scape 1-1.5 m tall; bracts subtending the umbel 4, lance-triangular,
acute. Flowers perfect, regular, 2-3 cm across, pink; sepals 3,
petaloid; petals 3; stamens 9-many, anthers elongate, filaments
slender; pistils 6, simple, whorled, united at the base, stigmas sessile,
apical, ovaries superior; pedicels 5-10 cm long. Fruit an indehiscent,
many-seeded capsule. Jun--Aug. Emergent in shallow to moderately deep water
of lakes and streams; locally introduced and established at widely scattered
locations in ND and SD; (Intro. to N.Amer. from Eurasia and adventive here from
the Great Lakes region).
Godfread, C. and W. T. Barker. 1975. Butomaceae: a new family record
for North Dakota. Rhodora 77:160-161.
Stuckey, R. L. 1968. Distributional history of Butomus umbellatus
in the western Lake Erie and Lake St. Claire region. Michigan Bot.
Return to Family -- Butomaceae - The Flowering