DavidHowdon's picture

Spiky dandelion

Observed: 20th May 2013 By: DavidHowdon
Amateur Entomologists' SocietyLondon Natural History SocietySelborne Society
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There is a separate entry for identification of the larva at http://www.ispot.org.uk/node/331758

Species interactions

Species with which Prickly Sow-thistle (Sonchus asper) interacts


DavidHowdon's picture

Which Sonchus

Thanks for all the ID suggestions. Looks pretty evenly split between unidentifed Sonchus and S. asper. What are they key features needed to get to species level?

cerigait's picture

S asper

S palustris - arrow shaped clasping lanceolate leaves narrow and grey green. Pale yellow flowers
S arvensis - broad rounded clasping leaf bases and involucres covered in sticky yellow gland hairs. Shiny green leaves and deep yellow flowers.
S oleraceus - pointed spreading basal lobes. Pale yellow flowers and toothed but non spiny lobes. Grey green colour leaves.
S asper - basal clasping lobes that are rounded and adpressed. Leaves often doubly toothed and crisped on edges that are Spiny. Flowers deep golden yellow.

DavidHowdon's picture


That is helpful.