Plant. Photo: Don Wood, ACT

Flowers. Australian Plant Image Index, photo: Murray Fagg, Cooma, NSW

Leaves and stem. Photo: Forest and Kim Starr, Hawaii

Common Name

Prickly Lettuce, Compass Plant, Milk Thistle




Introduced biennial forb to 1-2m tall.  Prickly or smooth stems.  Leaf margins and midrib spiny.  Leaves alternating up the stems, 3-20cm long, to 60mm wide, flat, glaucous, hairless, margins lobed, rarely entire. Upper leaves with basal lobes, stem-clasping.  Flowers yellow, with 7-18 'petals’. Flower heads narrow cylindrical, forming a large open group at the top of the stem.

Description and photo in G.M. Cunningham, WE Mulham, PL Milthorpe and J H Leigh (1981 and later printings) Plants of Western New South Wales pages 718-719

PlantNET description: