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''Lactuca muralis'' (wall lettuce), or ''Mycelis muralis'', is a perennial flowering plant of the genus ''Lactuca'' in the tribe dandlion tribe within the daisy family.〔Parnell, J. and Curtis, T. 2012. ''Webb's An Irish Flora''. Cork University Press. ISBN 978-185918-4783〕〔(Altervista Flora Italiana, ''Lactuca muralis'' (L.) Gaertn. ) includes photos and European distribution map〕 Its chief characteristic is an open airy clumps of yellow flowers. Each "flower" is actually a composite flower, consisting of 4-5 petal-like flowers (strap or ray flowers), each approximately 5–7 mm in length. There are no disc flowers. ''Lactuca muralis'' grows about 2–4 feet tall with the lower leaves pinnately toothed and clasping. ==Description== ''Lactuca muralis'' grows from 25 to 150 cm tall, is slender and hairless. It often has purplish stems, and exudes a milky juice. The lower leaves are lyre shaped, pinnate shaped. The lobes are triangular in shape. The upper leaves are stalkless, smaller and less lobed. All leaves are red tinged. The achenes are short beaked, spindle shaped and black. The pappus has simple white hairs,〔Parnell, J. and Curtis, Y. 2012. ''Webb's An Irish Flora.'' Cork University Press. ISBN 978-185918-4783〕 the inner longer than the outer. The flower heads are yellow, small with only 4-5 yellow ray florets. 1 cm wide more or less, on branches 90 degrees to the main stem, in loose panicle.〔Webb, D.A., Parnell, J. and Doogue. D. 1996. ''An Irish Flora''. Dundalgan Press (W. Tempest)Ltd. ISBN 0 85221 131 7〕 It flowers from June until September. 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「Lactuca muralis」の詳細全文を読む スポンサード リンク
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