Rough hawkbit
Thrincia hispida
Family · Asteraceae · Harmless
The yellow flower anyone would call a dandelion, and is not: a solid, not hollow, stem covered in two or three-pointed hairs, and a single head at the top.
Fields and pasture · Roadsides and waste ground · Dunes and sand · Uplands
Also known ashairy hawkbit, rough leontodon
How to tell it
A rosette of cut leaves covered in rough hairs branching into two or three points, seen with a lens and decisive. A leafless stem, solid when squeezed, with a single yellow head. The heads close in rain and at night. Without abundant latex, unlike dandelion.
What it is confused with
Dandelion
Taraxacum officinale
Squeeze the stem: hollow and full of milk in dandelion, solid and nearly milkless in this. And dandelion's outer bracts bend downward, this one's stay pressed close.
Open sheet →What it is for
No relevant use. It serves to dismantle a common error: not every yellow flower with a rosette is a dandelion, and the fastest way to separate them is to squeeze the stem, because a dandelion's is hollow and gives way.
Sources
No photo with a verified licence yet