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Ageratina riparia : ウィキペディア英語版 | Ageratina riparia
''Ageratina riparia'', commonly known as Mistflower or Creeping Croftonweed, is a species of flowering plant in the aster family, native to Mexico, Cuba and Jamaica.〔Turner, B. L. 1997. The Comps of Mexico: A systematic account of the family Asteraceae, vol. 1 – Eupatorieae. Phytologia Memoirs 11: i–iv, 1–272〕〔(Tropicos, ''Ageratina riparia'' (Regel) R.M. King & H. Rob. )〕 ==Description== Mistflower is a low growing, sprawling perennial herb that grows up to 40x60 cm high. Its stems produce roots at joints that touch the ground. The serrated leaves on average reach 7.5 cm long and 2.5 cm wide and taper at each end. The flowers are white with dense heads at the ends of the branches. Mistflower buds from July until August, with full flowering occurring from August through October. Seeds are black, slender, angular, 2 mm long, with fine white hairs at the tip. They are dispersed by wind and flowing water. Mature plants can produce between 10000 and 100000 seeds per year.〔Lalith Gunasekera, ''Invasive Plants: A guide to the identification of the most invasive plants of Sri Lanka'', Colombo 2009, p. 107–108.〕 Mistflower can be poisonous for mammals to eat.
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