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''Ageratum houstonianum'' (flossflower, bluemink, blueweed, pussy foot, Mexican paintbrush) is a cool-season annual plant often grown as bedding in gardens. The plant grows to 0.3–1 m high, with ovate to triangular leaves 2–7 cm long, and blue flowers (sometimes white, pink, or purple). The flower heads are borne in dense corymbs. The ray flowers are threadlike, leading to the common name.〔(New South Wales Flora Online, ''Ageratum houstonianum'' )〕 The plant is native to Central America and adjacent parts of Mexico, but has become an invasive weed in other areas.〔(【引用サイトリンク】 Ageratum houstonianum )〕〔(Species profile )〕 ''Ageratum'' has evolved an ingenious method of protecting itself from insects; it produces a methoprene-like compound which interferes with the normal function of the corpus allatum, the organ responsible for secreting juvenile hormone. This chemical triggers the next molting cycle to prematurely develop adult structures, and can render most insects sterile if ingested in large enough quantities. == Varieties == *''A. houstonianum'' var. ''angustatum'' B.L. Rob.〔(JSTOR Plant Science )〕 *''A. houstonianum'' f. ''isochroum'' *''A. houstonianum'' f. ''luteum'' *''A. houstonianum'' var. ''muticescens'' *''A. houstonianum'' f. ''niveum'' *''A. houstonianum'' f. ''normale'' *''A. houstonianum'' var. ''typicum'' *''A. houstonianum'' f. ''versicolor'' The cultivars 'Blue Danube',〔(RHS Plant Selector ''Ageratum houstonianum'' 'Blue Danube' AGM / RHS Gardening )〕 'Blue Horizon'〔(RHS Plant Selector ''Ageratum houstonianum'' 'Blue Horizon' AGM / RHS Gardening )〕 and 'Hawaii White'〔(RHS Plant Selector ''Ageratum houstonianum'' 'Hawaii White' AGM / RHS Gardening )〕 have gained the Royal Horticultural Society's Award of Garden Merit. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ageratum houstonianum」の詳細全文を読む スポンサード リンク
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