Biduri or Thistle (Calotropis gigantea) becomes one of the neglected plants. Although biduri is quite exotic and beautiful, but biduri plants are often allowed to grow wild and considered weeds. The Latin name of the widuri flower is Calotropis gigantea Dryand. The characteristic of the bleeding flower is when one part of the plant is injured, will release a white sap, dilute, bitter taste and kelat, gradually feels sweet, the smell is very stinging, and poisonous. Not much to glance at, even as an ornamental plant. Not many also reveal the benefits and efficacy of this flower. Though widuri flower is one of native plants of Indonesia. This widuri flower has several benefits for the health of one of stomach ulcers etc. This widuri flower can be cultivated using seeds.

In Indonesia the flower of widuri or biduri has some local mention like Rubik (Aceh) Biduri, Rembega, and Remingu (Melayu) Rumbigo (Minangkabau), Widuri (Sunda), Biduri, Saduri, Sidoguri, and Widuri (Java), and Bidhuri (Madura ). Also Manori, Maduri (Bali), Muduri, Rembiga, Kore, Krokoh, Kolonsusu, Modo Kapauk, and Modo Kampauk (Nusa Tenggara), and Rambega (Sulawesi). Whereas in English, this flowering plant is known as Giant Milkweed, Indian Bowstring Hemp, and Crown Flower.

Biduri flowers are upright bushes with a height between 0.5-3 meters. Biduri flowers have round stems, sturdy, pale skin. Biduri leaf in the form of single leaf, opposite, oval with blunt end and base of grooved, and leaf edge flat. The leaves are whitish green, measuring 8-30 cm long and 4-15 cm wide. Leaves have short stalks and pinnate bore. The upper surface of the leaves is thick-haired as young and gradually disappears when old. Flower Biduri compound with umbrella shape that grows at the end of twig (terminal) or in leaf armpits. Long flower stalks (3-5 cm) with flattened petals and oval taju, fluffy, and green, and have narrow protective leaves. Stamen form a tube and a wide pistil, five-sided. Flower-shaped crown, lilac color, white or purple-white cages, with a pale green tube, shallow-shaped saucer. Biduri fruit oval-shaped elongate resembling a hole with a hook-shaped end and green. The fruit is 9-10 cm long. The seeds are small, oval, flat, brown, short-haired and thick. Seeds have long silk hair-like tassels, so the seeds can be flown by the wind. Thistle may be propagated by seed.