A species of Grewia native to southern Asia from Pakistan, India east to Cambodia, and widely cultivated in other tropical countries.
Read in Urdu. Phalsa or Falsa, is a fruit of the tree Grewia asiatica, which is a native of India and other countries like Nepal, Pakistan, Bangladesh, Cambodia and Thailand. It has also been naturalised in Australia and the Philippines.  Grewia asiatica originated in Southern India, but it now grows in Pakistan, Bangladesh, Nepal, Sri Lanka, the Philippines, Thailand, Laos, Cambodia and Vietnam. In the subcontinent it is highly sought after in the hot summer months as it can be made into a cooling, refreshing drink, falsa sharbat.  Several Lepidoptera caterpillars are found to feed on Grewia species. These include the Common Nawab (Polyura athamas) and the swift moth Endoclita malabaricus. The Bucculatricidae leaf miner Bucculatrix epibathra is apparently only found on G. tiliaefolia. The parasitic wasp Aprostocetus psyllidis of the Eulophidae occurs on and around Phalsa (G. asiatica). Its larvae are parasitoids of other insects-possibly pests of the plant, but this is not known for sure. Grewia flavescens flowers in Hyderabad, India. Grewia tiliaefolia flowers in Hyderabad, India. The large flowering plant genus Grewia is today placed by most authors in the mallow family Malvaceae, in the expanded sense as proposed by in the APG. Formerly, it was placed in either the linden family (Tiliaceae) or the Sparrmanniaceae.  Origin of Phalsa. Phalsa originates in India and other parts of Southeast Asia, including Pakistan, Sri Lanka and Bangladesh. At of the early part of the 20th century, the fruit was introduced to Indonesia and the Philippines, where it has since naturalized.  Grewia asiatica (Phalsa or Falsa) (Urdu: فالسہ, Hindi: फ़ालसा) is a species of Grewia native to southern Asia from Pakistan, India east to Cambodia, and widely cultivated in other tropical countries. Grewia celtidifolia was initially considered a mere variety of Phalsa, but is now recognized as a distinct species. It is a shrub or small tree growing to 8 m tall. The leaves are broadly rounded, 5–18 cm long and broad, with a petiole 1–1.5 cm long. The flowers are produced in cymes of several together, the individual flowers about 2 cm diameter, yellow, with five large (12 mm) sepals and five smaller (4–5 mm) petals. PHALSA (Grewia asiatica). A plantation of phalsa in Pakistan. Family: Tiliaceae. Synonyms: Grewia subinequalis. Phalsa is indigenous throughout the Himalayan region. It is widely cultivated, especially near big cities, in tropical and subtropical India, Pakistan and Bangladesh. In the Philippines it is naturalized in Luzon and it is grown in northern and central Thailand. Grewia asiatica (Phalsa or Falsa) (Urdu: فالسہ) is a species of Grewia native to southern Asia from Pakistan east to Cambodia, and widely cultivated in other tropical countries. Grewia celtidifolia was initially considered a mere variety of Phalsa, but is now recognized as a distinct species. It is a shrub or small tree growing to 8 m tall. The leaves are broadly rounded, 5–18 cm long and broad, with a petiole 1-1.5 cm long. 2. Botanical Description and Traditional Uses Grewia asiatica is a 4 to 5 m tall shrub. The leaves are approximately 5–18 cm long and broad. The flowers are arranged in cymes of several together, the individual flowers are yellowish in color with five large (12 mm) sepals and five smaller (4–5 mm) petals.  Grewia asiatica is native to southern Asia from Pakistan east to Cambodia. In these areas it is widely cultivated and commonly known as Phalsa or Falsa. We simply refer to it a Sherbet Berry. Phalsa produces a edible drupe that is purple to black when ripe. This small fruit is loaded with antioxidants. 
http://www.hamariweb.com/articles/article.aspx?id=33457 http://herbs-treatandtaste.blogspot.com/2010/12/what-is-falsa-grewia-asiatica-small.html https://en.wikipedia.org/wiki/Grewia http://www.theplantencyclopedia.org/wiki/Grewia http://theindianvegan.blogspot.com/2013/03/all-about-phalsa-grewia-asiatica.html https://en.wikipedia.org/wiki/Grewia_asiatica http://fruitipedia.com/phalsa%20Grewia%20asiatica.htm http://www.theplantencyclopedia.org/wiki/Grewia_asiatica http://www.mdpi.com/1420-3049/18/3/2663/pdf http://www.agristarts.com/index.cfm/fuseaction/plants.plantDetail/plant_ID/312/index.htm
what is grewia asiatica