Glaucium flavum
Crantz Yellow Horned PoppyPlants biennial or perennial, to 80 cm high; stems branched. Leaf-blades to c. 20 cm long, pinnately lobed, deeply dentate, the lower lyrate, the upper ovate, bases cordate and stem-clasping. Pedicels stout, to 4 cm long. Sepals 20–30 mm long; petals obovate, 25–40 mm long, yellow, sometimes tinged orange, sometimes with a reddish to violet basal spot. Capsules straight or usually arcuate, to 30 cm long, glabrous, tuberculate or scabrous. Flowers Nov.–Mar.
VVP, GipP, OtP, WaP, Strz. Also naturalised SA, NSW, Tas. Native to western and southern Europe to the Black Sea and Transcaucasus in Asia, widely introduced beyond as a ballast waif and occasional garden-escape. Sporadic near the coast (e.g Port Fairy, Geelong, Altona, Phillip Is. etc.) in open, usually low-lying areas on or near shores in sand and calcareous soils.
Kiger, R.W. (1996). Glaucium. In: Walsh, N.G.; Entwisle, T.J., Flora of Victoria Vol. 3, Dicotyledons Winteraceae to Myrtaceae, pp. 66–67. Inkata Press, Melbourne.