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Argemone albiflora, the white prickly poppy, also known as the bluestem prickly poppy or the Texas prickly poppy, [1] is a small erect plant with a decorative white flower with a yellow latex. It is deeply rooted with yellow or red stamens. The plant is known for the sharp prickles on its stem and leaves.
The plant has pinnately compound leaves with 5–11 membranous leaflets. It has axillary flower and fruit clusters. [3] The buds are hairy. The dark green leaves are bitter-aromatic, with crenate margins. [3] [6] The stalked follicles are green and then turn red [6] through deep blue through black. [3] [7] Flowers are dioecious, with yellow ...
When the flowers are in a raceme, the flowers at the top bloom first and turn into fruits by the time the lower flowers have bloomed. [1] The seeds germinate when sown in mild heat conditions or a warm bright spot under the sun. Germination of seeds is slow but reliable when sown in a cool place during spring. Plants like well-drained neutral soil.
The flowers are arranged on the ends of branchlets, sometimes also in leaf axils, in panicles up to 150 mm (5.9 in) long. Each flower is on a pedicel 1.5–6 mm (0.059–0.236 in) long, the four sepals joined at the base and 0.5–1 mm (0.020–0.039 in) long and the four petals white or yellowish white and 1–2 mm (0.039–0.079 in) long.
Glochids are also present on the fruit. This is the source for the plants common name "prickly pear". The flowers are bright yellow with a pale green to orange or red center. In some regions occasional plants may produce flowers of other colors such as orange, pink, or magenta. The edible fruits are usually red or purple with a pink seedy flesh.
The flower heads are 1–1.5 cm (1 ⁄ 2 – 1 ⁄ 2 in) wide, [4] pale yellow, often tinged purple, with 12–20 ray flowers but no disc flowers. The bracts are also often tinged purple. It flowers from July until September in the northern hemisphere. The achenes are grey, tipped with bristles. The pappus is white with equal length hairs. [5] [6]