Monochoria vaginalis




Family Pontederiaceae
Scientific name Monochoria vaginalis (Burman f.) C. Presl ex Kunth
Synonyms Monochoria vaginalis var. plantaginea (Roxburgh) Solms-Laubach; Pontederia vaginalis N. L. Burman; Boottia mairei H. Léveillé; Monochoria linearis (Hasskarl) Miquel; Monochoria ovata Kunth; Monochoria vaginalis var. pauciflora (Blume) Merrill; Pontederia linearis Hasskarl; Pontederia ovata Hooker & Arnott ; Pontederia pauciflora Blume; Pontederia plantaginea Roxburgh.
Common name (Japanese common name) ko-nagi (コナギ, 小菜葱 [meaning: tiny nagi (nagi = Japanese old name of Monochoria korsakowii)])
(English common name) heartshape false pickerelweed
Distribution (Japan) Honshu, Shikoku, Kyushu, Okinawa
(Other nations) Russia, Korea, China, Philippines, Thailand, Vietnam, Cambodia, Laos, Malaysia, Myanmar, Indonesia, Australia, Nepal, Bhutan, India, Sri Lanka, Pakistan, Africa
Habitat Rice paddy, swamp
Chromosomal number 2n=52
Description Leaves 10-20cm long, 3-7cm wide. Flowers blue 1.5-2cm across, flowering in September to October. Annual plants.
Reference  Monochoria vaginalis (Burm. f.) C. Presl ex Kunth
Monochoria vaginalis (N. L. Burman) C. Presl ex Kunth
Herbicide for use in transplanted rice (US Patent 3955959/1976)
Methods and compositions for the selective control of undesirable weed species in the presence of wet-land crops (US Patent 4488896/1984)
Herbicidal composition (US Patent 6030925/2000)
Herbicidal sulfonamides (US Patent 6060432/2000)
Substituted pyrazole derivatives, production process thereof, and herbicide compositions containing the derivatives (US Patent 7192906/2007)



September 2006
at lowland marsh
September 2006
at lowland marsh
September 2006
at lowland marsh