Butomus umbellatus L.
  • Sp. Pl.

This taxon is accepted by Butomaceae
Notes: More details could be found in The Plant List v.1.1. Originally in The Plant List v.1.0

General Description

Leaves twisted, 30-120 cm × 3-10 mm, apex acuminate. Scapes terete, ca. 70 cm; bracts ovate, apex acuminate. Flowers numerous; pedicels 4-10 cm. Sepals pinkish white, greenish outside along midvein. Petals pinkish white. Filaments flat-tened, broadened toward base. Styles curved. Seeds small. Fl. and fr. Jul-Sep. 2n = 20 or 40, with aneuploid counts of 16, 22, 24, 26, 28, 39, 42.

Herbs, to 150 cm. Leaves linear, to 2.7 m. Inflorescences with 20--25 flowers; scape to 150 cm. Flowers 2--2.5 cm wide; pedicels 4--10 cm; outer tepals elliptic, 6--7.5 × 2--2.5 mm, apex acute, inner tepals oblanceolate, 9--11.5 × 4.5--6 mm, apex obtuse, erose; filaments 3--4.5 mm, anthers 1 mm. Follicles 1 cm.

"Lvs basal, erect, floating, or submersed in water up to several m deep, linear, to 1 m, 5–10 mm wide; scape 1–1.5+ m; fls numerous, 2–2.5 cm wide, on pedicels 5–10 cm;2n=20, 26, 39. Native of Eurasia, thoroughly established on shores and riverbanks in the St. Lawrence R. valley and in Lake Champlain, and more recently spread inland, even to N.D., S.D., Mont., and Ida. June–Aug."

 Information From

World Flora Online Data. 2017.
  • A CC0 1.0 Universal (CC0 1.0).
Flora of North America @ efloras.org
'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  • B Flora of North America Association
Flora Of CHina @ efloras.org
'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  • C Missouri Botanical Garden
New York Botanical Garden
Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
  • D Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Flora Online consortium
World Flora Online Data. 2018.
  • E CC0 1.0 Universal (CC0 1.0).
International Union for Conservation of Nature
IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
  • F See IUCN Terms and conditions of use http://www.iucnredlist.org/info/terms-of-use