The basal leaves of young plants have similarities to : Prickly Saltwort. Some similarities to : Greater Celandine in that it has large yellow flowers and glaucous green foliage, but Yellow-horned Poppy grows next the sea.

Uniquely identifiable characteristics : No other plant quite looks like this one.

Distinguishing Feature : Grows on shingle beaches above low tide, is greyish green with yellow poppy-like flowers, and preposterously long curved seed pods (the 'horns').

In their first year, the plant just has a basal rosette of hairy greyish-green pinnately-lobed leaves. In the second year the plant grows further, producing encompassing glaucous greyish green leaves without hairs, and flowers in the form of a yellow poppy. The flower, later in the year, sprouts an enormously long seed pod from the centre, which when ripened, splits lengthways to yield the seeds.

It is salt-tolerant, and grows almost exclusively on shingle beaches washed by the high tide, hardly ever on sand.

It contains the aporphine group alkaloid Glaucine which is found in several other Poppy species and has bronchodilatory and anti-inflammatory effects. Glaucine is used medicinally in some countries but one of the side effects are chromatic hallucinations. This makes it a target as a recreational drug. [Glaucine should not be confused with the Amino Acid Glycine]. Barberry has a greater collection of Aporphine group alkaloids.

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