The button flower (English: Gomphrena globosa), commonly known as the globe amaranth, velvet, bachelor's button, and vadamali, is an edible plant in the genus Gomphrena of the family Amaranthasia. Round flower inflorescences have apparently dominant features, and the cultivation of magenta, purple, red, orange, white, pink, and lilac dye varieties (or shades) is promoted in cultivation. Within the flower head, the true flowers are small in size and indistinct.
G. Globosa is native to the Central American regions of Brazil, Panama, and Guatemala but is now grown worldwide.  As a tropical annual plant, G. Globosa blooms continuously in summer and early autumn. It is very heat tolerant and fairly drought resistant but grows well in full sun and regular humidity.The plant is able to absorb carbon from the air via the C4 pathway.  At maturity, the flower heads are about 4 cm long and the plant grows to a height of 24 inches. 
G. Globosa is an extinct species that is pollinated by butterflies, bees and other insects. Promoting the stimulation of pollen probably plays an important role in the reproductive success of flowering plants.
The part of the button flower that is called the flower is not the flower at all. It is actually a cotyledon which in the language of botany we call "bracket" in English. Plants use this transformed leaf to attract insects. The small flowers that can be seen around here are the real flowers, as seen in Baganbilas.
I will discuss the naming history in the next post.
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