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Cirsium pumilum var. hillii : ウィキペディア英語版 | Cirsium pumilum var. hillii
''Cirsium pumilum'' var. ''hillii'' is a type of thistle endemic to North America. The common name for this plant is Hill’s thistle. == Description == Hill's thistle is a low-growing thistle usually reaching 25 to 60 cm (10-24 inches) in height, with a taproot system that runs deep into the ground. It is a perennial plant usually living for three years, and flowers in July and August.〔 The plant’s leaves are an elliptic-oblong shape with serrated edges, have tiny prickles, and have one central vein with smaller veins branching from it. The top of the stem holds a composite flower head, each consisting of many individual disc florets but no ray florets.〔 The flowers of this plant are usually purple though sometimes pink or white.〔 Hill's thistle tends to looks very similar to ''Cirsium vulgare'' during its seedling and rosette stages; one can easily be mistaken for the other.〔〔(Flora of North America, Hill’s thistle, ''Cirsium pumilum'' (Nuttall) Sprengel var. ''hillii'' (Canby) B. Boivin )〕
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「Cirsium pumilum var. hillii」の詳細全文を読む
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