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Meconopsis horridula or Prickly Blue poppy, is a flowering plant from the Papaveracea family. It is an endangered species that grows in high altitudes. The height of the plant varies from 20 cm to 1m. It is a monocarpic, dicot plant.
Meconopsis horridula can be found from as far west as western Nepal, through the central and eastern Himalayas, to south-eastern Tibet (Xizang) and western China (western Kansu to Sichuan and north-western Yunnan).
Habitat and ecology
Meconopsis horridula grows in rocky areas and grass slopes at altitudes from 3100 to almost 6000m, close to the limit for vegetation at these altitudes. These plants can be grown in slightly shaded or sunny, cool areas, in meadows and rocky regions. They can also grow with other shrubs such as the rhododendron. They require plenty of moisture while growing and do not need protection from winter. Since they grow on high altitudes, they can tolerate temperatures as low as -10 degrees F. The flower color is not affected by the alkalinity of the soil.
Meconopsis horridula is a species with many variations in leaf structure and inflorescence. In the wild, the flowers are solitary or arranged in a raceme. The plant is monocarpic (it produces seeds and dies) with a plump taproot. The stem and pedicels have straw-colored spines on their surface.
The plant has basal leaves (about 25 cm) arranged in a rosette. The leaves are elliptical or narrow-oblong shaped, tapering into the petiole. The leaf margin is entire or slightly lobed or toothed. The leaves have a base attenuate to petiole and an obtuse or acute apex. The adaxial and abaxial surface of the leaf is covered with yellowish or purplish spines that grow from purple wart-like structures. In some cases they are covered with bristles. The upper leaves are smaller and bract-like. "Meconopsis horridula" has deciduous leaves.
The open-faced flowers are usually in shades of blue or reddish blue, but rarely white. The flowers are 5-7.5 cm in size. The stalk is usually less than 22 cm long. The stalk that bears the flower is bent, so the flower is not held upright and is droopy. The overlapping petals are arranged in a broad cup shape. The 4-8 petals are oval. The sepals have bristles on the adaxial surface. When solitary, flowers are arranged on scape. In some cases, the flowers are gathered together (agglomerated) in the lower half of the stem. 
The stamens (10-14mm) hold greyish-black anthers and the pollen is yellow or orange-yellow. The filaments and petals are similar color usually. The pistil consists of a style (6-7mm) with yellow stigma. The ovary is conical and has compressed spines on the outer surface.
The seeds are reniform, small, dark brown and have pointed ends. They are contained within a pod covered with spines (spines have thickened base). This pod is called a capsule, which is a domed cylinder tapering towards one end. The capsule is about 1.5cm to 2 cm long and 0.6cm to 1.1cm wide. Since "Meconopsis horridula" is a dicot plant, the seeds have two cotyledons. 
Meconopsis horridula is used for ornamental and horticultural purposes but considering the monocarpic nature of the plant, it is difficult to cultivate. It has been cultivated from 1904, mostly coming from China and Tibet.
When cultivated, the basal leaves die and a dormant bud is left behind along with a tap root. The new saplings have few leaves and are vulnerable to strong winds. The plants take about two years (2-3 seasons after the seed) to reach the flowering stage. They are fairly resistant to droughts. They are tolerant and robust when it comes to growing in gardens. 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. 
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. "Meconopsis horridula" plants like well-drained neutral soil. The young seedling has heart-shaped leaves.
"Meconopsis horridula" was used in Chinese traditional herbal medicine because of its anti-inflammatory and analgesic qualities. As such, they are widely extracted thereby making this species endangered. Although one Meconopsis horridula plant produces many seeds, germination is low in natural and laboratory settings. As the demand for this plant increases more and more plants are likely to be uprooted.
- Grey-Wilson, Christopher (1995). Poppies : a guide to the poppy family in the wild and in cultivation ([Repr.] ed.). Portland, Or.: Timber Press. ISBN 0881922323.
- Meconopsis horridula in Flora of China
- B, Wang; Song XH; Cheng CM; Yang JS (2003). "Studies on species of Meconopsis as Tibetan medicines". Chinese Wild Plant Resources (22): 43–46.
- Wangchuk, Phurpa; Ugyen, Annette Olsen. "Vulnerable Medicinal Plants and the Risk Factors for their Sustainable Use in Bhutan". Journal of Bhutan Studies: 66–90.