- An herbaceous biennial, 1-2 feet tall. Stems are branched.
- once to twice pinnately divided
- ovate to obovate
- glaucous beneath
- short, soft hairs along veins on underside of leaves
- short, soft hairs
- exude yellow-orange sap when broken
- stems swollen at base
- Yellow, four-petaled flowers with many stamens. Flowers are arranged in small umbels and are held in leaf axils. Blooms from May to June.
- green capsules are lumpy
- linear to oblong
- seeds black
- roadsides, disturbed areas
- along fences, buildings
Key ID Features:
- light green divided, lobed leaves
- small, 4 petaled yellow flowers
- magenta seed vessels
- yellow-orange juice from broken stems
- Yellow hornpoppy (Glaucium flavum)
- Celandine poppy (Stylophorum diphyllum)
- Bushy rock-cress (Cardamine impatiens)
- This species can be numerous in disturbed sites and outcompete native plants.
- On Nantucket, this species is fairly prevalent, mostly on roadsides and wooded edges.
Growth Form: Herb
Origin: Europe, Asia
Level of Invasiveness for Nantucket: Do not list at this time
Level of Invasiveness for Massachusetts: Not evaluated
Massachusetts Cultivation Restrictions: no