Canna indica

Canna indica, commonly known as Indian shot, African arrowroot, edible canna, purple arrowroot, Sierra Leone arrowroot, is a plant species in the family Cannaceae. It is native to much of South America, Central America, the West Indies, Mexico, and the southeastern United States (Florida, Texas, Louisiana, and South Carolina). It is also naturalized in much of Europe, sub-Saharan Africa, Southeast Asia, and Oceania. Canna indica (achira in Latin America, cana-da-índia in Brazil) has been a minor food crop cultivated by indigenous peoples of the Americas for thousands of years. Canna indica is a perennial growing to between 0.5 m and 2.5 m, depending on the variety. It is hardy to zone 10 and is frost tender. The flowers are hermaphrodite. Canna indica sps. can be used for the treatment of industrial waste waters through constructed wetlands. It is effective for the removal of high organic load, color and chlorinated organic compounds from paper mill wastewater. It forms branched rhizomes 60 cm long that are divided into bulbous segments and covered in two lines by pale green or purple flaky leaves. The very large grains of starch stored there can supposedly be seen with the naked eye. Cannae indicae reach, depending on the variety, stature heights of up to about 2 meters. They form an upright, unbranched stem or the overlapping leaf sheaths form a pseudo trunk. The alternate and spiral or two-line arranged, very large, simple leaves are divided into leaf sheaths, short petioles and leaf blades. The leaf blade has a length of 30 to 60 cm and a width of 10 to 20 cm. The parallel leaf veins arise from the midrib (not typical of monocots). The leaves are broad, green or violet green, with petiolesshort and elliptical sheets, which can measure 30 to 60 cm long and 10 to 25 cm wide, with the base obtuse or narrowly cuneate and the apex is shortly acuminate or sharp. The surface of the rhizome is carved by transverse grooves, which mark the base of scales that cover it; from the lower part white and apex rootlets emerge, where there are numerous buds, the leaves sprout, the floral stem and the stems. The hermaphrodite, mostly large flowers are zygomorphic and threefold. On pedicels, they are 0.2–1 cm long, red or yellow-orange, except in some cultivars, 4.5–7.5 cm long, with the sepals being closely triangular, 1–1.7 cm long and the petals erect, 4–6.5 cm long. The tube is 1.5–2 cm long. The bracts are designed differently. The three free sepals are usually green. The three petals are green or have depending on the variety shades of yellow about orange and red to pink. The base of the petals is fused with the staminodien to a stamen column. There are two circles, each with originally three stamens present. The petals and staminodes are usually yellow to red. The three carpels are at a constant under (syncarp) ovary adherent which has a soft-spiky surface and many central angle constant ovules contains. The pollen is deposited on the abaxial (off-axis) surface of the stylus. The pollination mechanism is very specialised and the pollination is done by insects. The insects pick up the pollen from the flattened style. In their homeland, the bloom by humming pollinated. There they bloom in the months of August to October. The fruits are ellipsoid capsules to globose, warty, 1.5 to 3 cm long, chestnut coloured, with a large amount of black and very hard seeds. The seeds are small, globular, black pellets, hard and dense enough to sink in water. They resemble shotgun pellets giving rise to the plant's common name of Indian shot. The seeds are hard enough to shoot through wood and still survive and later germinate. According to the BBC 'The story goes that during the Indian Mutiny of the 19th century, soldiers used the seeds of a Canna indica when they ran out of bullets.' The seeds are widely used for jewellery. The seeds are also used as the mobile elements of the kayamb, a musical instrument from Réunion, as well as the hosho, a gourd rattle from Zimbabwe, where the seeds are known as 'hota' seeds.