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| August 2007 at riverside |
August 2007 at riverside |
August 2007 at riverside |
| Family | Asteraceae (alt. Compositae) |
| Scientific name | Ambrosia trifida L. |
| Synonyms | Ambrosia aptera de Candolle; Ambrosia integrifolia Muhlenberg ex Willdenow; Ambrosia simplicifolia Walter; Ambrosia striata Rydberg; Ambrosia trifida L. forma integrifolia (Muhlenberg ex Willdenow) Fernald; Ambrosia trifida L. var. aptera (de Candolle) Kuntze; Ambrosia trifida L. var. normalis Kuntze; Ambrosia trifida L. var. heterophylla Kuntze; Ambrosia trifida L. var. integrifolia (Muhlenberg ex Willdenow) Torrey & A. Gray; Ambrosia trifida L. var. polyploidea J. Rousseau; Ambrosia trifida L. var. texana Scheele; Ambrosia variabilis Rydberg |
| Common name | (Japanese common name) oh-buta-kusa (オオブタクサ, 大豚草 [meaning: large pig weed]) |
| (English common name) buffalo weed, giant ragweed, great ragweed, horse weed | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) [native] Canada, USA, Mexico | |
| Habitat | Wet field, riverside |
| Chromosomal number | 2n=24, 48 |
| Description | Plants electing 1-3m (native 4-6m) tall. Leaves 20-35cm long, hairy. Flowers male infrorescences 5-20cm long, flowering in July to September. Fruits 7-10mm long. Annual plants. |
| Reference | Ambrosia trifida L. |
| Ambrosia trifida L. | |
| Ambrosia trifida L. | |
| Ambrosia trifida Linnaeus | |
| Note | Naturalized plants (first discovered in 1952). |
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| August 2007 at riverside |
August 2007 at riverside |
August 2007 at riverside |
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| August 2007 at riverside |
August 2007 at riverside |
August 2007 at riverside |
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| August 2007 at riverside |
August 2007 at riverside |
August 2007 at riverside |
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| August 2007 at riverside |
August 2007 at riverside |
August 2007 at riverside |
