Its chief characteristic is an open airy clumps of yellow flowers. Each "flower" is actually a composite flower, consisting of five petal-like flowers (strap or ray flowers), each approximately 5–7 mm in length. Lactuca muralis grows about 2–4 feet tall with the lower leaves pinnately toothed and clasping.
It 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, the inner longer than the outer.
Distribution and Ecology
- Blamey, Fitter, Fitter, Marjorie, Richard, Alistair (2003). Wild Flowers of Britain and Ireland. A & C Black - London. pp. 302–303. ISBN 0-7136-5944-0.
- Sterry, Paul (2006). Complete British Wild Flowers. HarperColins Publishers Ltd. pp. 212–213. ISBN 978-0-00-781484-8.
- Webb, D.A., Parnell, J. and Doogue. D. 1996. An Irish Flora. Dundalgan Press (W. Tempest)Ltd. ISBN 0 85221 131 7
- Rose, Francis (1981). The Wild Flower Key. Frederick Warne & Co. pp. 390–391. ISBN 0-7232-2419-6.
- Turner and Gustafson, Wildflowers of the Pacific Northwest.
- Hackney, P. Ed. 1992. Stewart and Corry's Flora of the North-east of Ireland. Institute of Irish Studies and The Queen's University of Belfast. ISBN 0 85389 446 9(HB)
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