scale bar = 1cm.
Sow Thistle - introduced (*Sonchus oleraceus)
Other names: Milk Thistle.
Family: Asteraceae (Daisy family).
Native of Europe and south-western Asia.
Occurrence: A widespread and common weed. Grows in farmland, on roadsides, lawns and gardens and disturbed bushland.
- it is an erect plant to about half a metre high
- the yellow flowers are partly enclosed by the green outer bracts
- the leaves along the stem extend backwards to points
- the leaves are lobed and toothed, but are not prickly
- it has basal and stem leaves
- the sap is milky.
Sow Thistle is a variable species and there is much variation in leaf shape. It flowers for
most of the year.
Clammy Sow Thistle (Sonchus tenerrimus
) is now included in S. oleraceus.
Similar species: Rough Sow-thistle (Sonchus asper)
has prickly leaves, is often stouter, and has rounded leaf bases.