Yellow Horned Poppy (EwA Guide to Common Invasive Species in Middlesex County (MA, US) )

Yellow Horned Poppy

Glaucium flavum

Summary ⁶

Glaucium flavum, the yellow horned poppy, yellow hornpoppy or sea poppy, is a summer flowering plant in the family Papaveraceae. It is native to Europe, Northern Africa, Macaronesia and temperate zones in Western Asia. The plant grows on the seashore and is never found inland. All parts of the plant, including the seeds, are toxic.

Description ⁶

It has thick, leathery deeply segmented, wavy, bluish-grey leaves, which are coated in a layer of water-retaining wax. The sepal, petals and stamen have a similar structure and form to the red poppy (Papaver rhoeas), except the sepals are not hairy. It grows up to 30–90 cm (1–3 ft) tall, on branched, grey stems. It blooms in summer, between June and October. It has bright yellow or orange flowers, that are 7.5 cm (3 in) across. Later it produces a very long, upright, thin, distinctive horn shaped capsule, which is 15–30 cm (6–12 in) long. It is divided into two chambers, which split open to reveal the seeds.

Invasiveness ⁷

Glaucium flavum is classed as a noxious weed in some areas of North America, where it is an introduced species. It is grown in gardens as a short-lived perennial but usually grown as a biennial.

🚧 Control Methods (EwA Content Development in Progress) ⁸

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Sources and Credits

(c) Chris M. Garside, some rights reserved (CC BY-NC), uploaded by Chris M. Garside, https://www.inaturalist.org/observations/149337571
(c) Bill MacIndewar, some rights reserved (CC BY-NC), uploaded by Bill MacIndewar, https://www.inaturalist.org/observations/73576869
(c) jykernel, some rights reserved (CC BY-NC), uploaded by jykernel, https://www.inaturalist.org/observations/149566150
(c) Wikipedia, some rights reserved (CC BY-SA), https://en.wikipedia.org/wiki/Glaucium_flavum
Adapted by Claire O'Neill from a work by (c) Wikipedia, some rights reserved (CC BY-SA), https://en.wikipedia.org/wiki/Glaucium_flavum
(c) Claire O'Neill, some rights reserved (CC BY-SA)

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