Ouret lanata (synonym Aerva lanata), the mountain knotgrass,[1] is a woody, prostrate or succulent, perennial herb in the family Amaranthaceae, native to the tropics of Africa and Asia. It has been included as occurring in Australia by the US government, but it is not recognised as occurring in Australia by any Australian state herbarium or Plants of the World Online.[2] The plant sometimes flowers in the first year.[3] [4]
Ouret lanata is a common weed which grows wild everywhere in the plains of India. The root has a camphor-like aroma. The dried flowers which look like soft spikes, are sold under the commercial names Buikallan and Boor. It is one of the plants included in Dasapushpam, the ten sacred flowers of Kerala.
Mountain knotgrass is an annual with a branching, somewhat woody root system. The stems are mostly straggling and sprawling and spread widely, sometimes as much as in length. The often stalkless leaves are alternate, oval and 0.5to long. They grow from whitish papery stipules with two lobes and red bases. The tiny clusters of two or three flowers grow in the leaf axils. The flowers are about 0.1inches long, pink, green or dull white. The flowers are normally self-pollinated. Flowering time is from May to October.[5]
Ouret lanata is native to tropical Africa, Madagascar, Egypt, Saudi Arabia and Yemen, the Indian subcontinent, Vietnam, Peninsular Malaysia, Sumatra, Java, the Philippines, and New Guinea. The species prefers damper sites than Aerva javanica and can be found in open forests on mountain slopes, on waste and disturbed ground, deserted cultivation and coastal scrub[3] and at elevations from sea level to 900m (3,000feet).[6] It is a common weed in arable fields and bare patches of ground.
This plant is used for food for people and animals. The whole plant, especially the leaves, is edible. The leaves are put into soup or eaten as a spinach or as a vegetable. The plant provides grazing for stock, game and chickens. The plant is used as a traditional medicine for snakebites.[5]
Though the plant has a lot of medicinal properties it is quite commonly used in South India during the Tamil festival "Pongal" and Telugu harvest festival "Sankranti" as the flower of this plant is used for decoration. In Telugu language it is also called as "Pindi kommalu" and in Tamil language it is also called as Ponga-Poo, which is derived from the names Pongal – A Harvest festival of Tamil Nadu and Poo in Tamil means Flower. Other common Tamil names used for this plant are "Kannu Pillai Poo" and "Siru Poolai".http://www.bhoominaturals.in/aerva-lanata-2/
The plant is also used as a talisman against evil spirits, a good-luck talisman for hunters, and a talisman for the well-being of widows.[4]
In the traditional medicine of India, the juice of crushed Ouret lanata root is used for jaundice therapy.[7]