Millettia pinnata

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Millettia pinnata
Pongamia pinnata (Karanj) near Hyderabad W IMG 7633.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Tribe: Millettieae
Genus: Millettia
M. pinnata
Binomial name
Millettia pinnata
    • Cytisus pinnatus L.
    • Derris indica (Lam.) Bennet
    • Galedupa indica Lam.
    • Galedupa pinnata (L.) Taub.
    • Pongamia glabra Vent.
    • Pongamia mitis Kurz
    • Pongamia pinnata (L.) Pierre

Millettia pinnata is a species of tree in the pea family, Fabaceae, native to eastern and tropical Asia, Australia, and Pacific islands.[1][2][3][4] It is often known by the synonym Pongamia pinnata. Its common names include Indian beech and Pongame oiltree.[2][3]


Millettia pinnata is a legume tree that grows to about 15–25 m (50–80 ft) in height with a large canopy that spreads equally wide. It may be deciduous for short periods. It has a straight or crooked trunk, 50–80 cm (20–30 in) in diameter, with grey-brown bark, which is smooth or vertically fissured. Branches are glabrous with pale stipulate scars. The imparipinnate leaves of the tree alternate and are short-stalked, rounded, or cuneate at the base, ovate or oblong along the length, obtuse-acuminate at the apex, and not toothed on the edges. They are a soft, shiny burgundy when young, and mature to a glossy, deep green as the season progresses, with prominent veins underneath.[5]

Flowering generally starts after 3–4 years with small clusters of white, purple, and pink flowers blossoming throughout the year. The raceme-like inflorescences bear two to four flowers that are strongly fragrant and grow to be 15–18 mm (0.59–0.71 in) long. The calyx of the flowers is bell-shaped and truncated, while the corolla is a rounded ovate shape with basal auricles and often with a central blotch of green color.[3][6]

Croppings of indehiscent pods can occur by 4–6 years. The brown seed pods appear immediately after flowering, and mature in 10 to 11 months. The pods are thick-walled, smooth, somewhat flattened, and elliptical, but slightly curved with a short, curved point. The pods contain within them one or two bean-like brownish-red seeds, but because they do not split open naturally, the pods need to decompose before the seeds can germinate. The seeds are about 1.5–2.5 cm (0.59–0.98 in) long with a brittle, oily coat, and are unpalatable in natural form to herbivores.[5][6][7]

The species is naturally distributed in tropical and temperate Asia, from India to Japan to Thailand to Malesia to north and north-eastern Australia to some Pacific islands;[1][3] It has been propagated and distributed further around the world in humid and subtropical environments from sea level to 1200 m, although in the Himalayan foothills, it is not found above 600 m.[8] Withstanding temperatures slightly below 0 °C (32 °F) and up to about 50 °C (122 °F) and annual rainfall of 500–2,500 mm (20–98 in), the tree grows wild on sandy and rocky soils, including oolitic limestone, and will grow in most soil types, even with its roots in salt water.[9]

The tree is well suited to intense heat and sunlight, and its dense network of lateral roots and its thick, long taproot make it drought tolerant. The dense shade it provides slows the evaporation of surface water and its root nodules promote nitrogen fixation, a symbiotic process by which gaseous nitrogen (N2) from the air is converted into ammonium (NH4+, a form of nitrogen available to the plant). M. pinnata is also a freshwater flooded forest species, as it can survive total submergence in water for few months continuously. M. pinnata trees are common in Tonlesap lake swamp forests in Cambodia.[citation needed]

Millettia pinnata is an outbreeding diploid legume tree, with a diploid chromosome number of 22.[6] Root nodules are of the determinate type (as those on soybean and common bean) formed by the causative bacterium Bradyrhizobium. trad


Millettia pinnata is well-adapted to arid zones, and has many traditional uses. It is often used for landscaping as a windbreak or for shade due to the large canopy and showy, fragrant flowers. The flowers are used by gardeners as compost for plants requiring rich nutrients. The bark can be used to make twine or rope, and it also yields a black gum that has historically been used to treat wounds caused by poisonous fish. The wood is said to be beautifully grained, but splits easily when sawn, thus relegating it to firewood, posts, and tool handles.[8]

Millettia pinnata seeds generally contain oil (27-39%), protein (17-37%), starch (6-7%), crude fiber (5-7%), moisture (15-20%) and ash content (2-3%).[7] While the oil and residue of the plant are toxic and induce nausea and vomiting if ingested in its natural form, the fruits, sprouts and seeds are used in traditional medicine.[9][7] Nearly half of the oil content of M. pinnata seeds is oleic acid.[10] Oil made from the seeds, known as pongamia oil, has been used as lamp oil, in soapmaking, and as a lubricant. The oil has a high content of triglycerides, and its disagreeable taste and odor are due to bitter flavonoid constituents, including karanjin, pongamol, tannin, and karanjachromene.[9] It can be grown in rainwater harvesting ponds up to 6 m (20 ft) in water depth without losing its greenery and remaining useful for biodiesel production.[11]

Long used as shade tree, M. pinnata is self-seeding and can spread lateral roots up to 9 m (30 ft) long in 18 years.[12] If not managed carefully, it can quickly become a weed.[13] M. pinnata is broadly distributed across India, Asia, Africa, northern Australia and the Pacific and Caribbean Islands and has been cultivated and transported since the 19th century or earlier. As a result, some literature declares M. pinnata naturalized in Africa and certain parts of the United States, while its status as naturalized or native is uncertain in other regions.[14] This dense network of lateral roots, though, makes this tree ideal for controlling soil erosion and binding sand dunes.[8]


Pacific Renewable Energy trial plantation in Caboolture, Queensland

The seed oil has been found to be useful in diesel generators, and along with Jatropha and castor, it is being explored in hundreds of projects throughout India and the third world as feedstock for biodiesel.[15] M. pinnata as a biofuel is commercially valuable to the rural populations of places such as India and Bangladesh, where the plant grows abundantly, because it can support the socioeconomic development of these areas.[16][17]

Several unelectrified villages have used pongamia oil, simple processing techniques, and diesel generators to create their own grid systems to run water pumps and electric lighting.[18]

Research indicates potential use of M. pinnata as a food source for cattle, sheep and poultry, as its byproduct contains up to 30% protein.[19][20] A report commissioned and financed by Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH found that the protein-rich byproduct can be free from alkaloids and therefore a dietary source of protein for humans.[7]

See also[edit]


  1. ^ a b c "Millettia pinnata". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2010-05-02.
  2. ^ a b "Plants profile for Millettia pinnata (pongame oiltree)". PLANTS Profile. United States Department of Agriculture. Retrieved 2012-03-30.
  3. ^ a b c d F.A. Zich; B.Hyland; T. Whiffen; R.A. Kerrigan. "Pongamia pinnata var. pinnata". Australian Tropical Rainforest Plants (RFK8). Centre for Plant Biodiversity Research, Australian Government. Retrieved 26 May 2021.
  4. ^ "Pongamia pinnata (L.) Pierre — the Plant List".
  5. ^ a b Orwa C.; Mutua A.; Kindt R.; Jamnadass R.; Simons A. (2009). "Pongamia pinnata; Fabaceae - Papilionoideae; (L.) Pierre; pongam, karanj, karanga, kanji" (PDF). Agroforestry Database version 4.0. Retrieved 2013-11-27.
  6. ^ a b c "Weed Risk Assessment : Pongamia" (PDF). Retrieved 2013-11-21.
  7. ^ a b c d Yogesh, Gokhale; Sharma, JV; Sharma, Priya; Burnwal, Kundan (March 2020). "CULTIVATION AND HARVESTING OF PONGAMIA PINNATA (KARANJ)" (PDF). MARKET STUDY OF THE EXISTENT AND POTENTIAL Indian Pongamia Pinnata Seeds Market: 7. Retrieved 22 July 2021.
  8. ^ a b c Pongamia pinnata - a nitrogen fixing tree for oilseed Archived 2016-01-17 at the Wayback Machine
  9. ^ a b c "Factsheet from New crops at Purdue University". 1998-01-08. Retrieved 2013-09-28.
  10. ^ "Pongamia Factsheet" (PDF). Retrieved 2013-09-28.
  11. ^ "Rain water harvesting by fresh water flooded forests". Retrieved 2013-09-28.
  12. ^ "Pongamia pinnata Pongam, Karum Tree, Poonga-Oil Tree, Indian Beech". PFAF Plant Database. Retrieved 22 July 2021.
  13. ^ "Agrofostree Species profile: Pongamia pinnata". World of Agroforestry. Retrieved 22 July 2021.
  14. ^ "Pongamia Risk Assessment" (PDF). Retrieved 22 July 2021.
  15. ^ Karmee, SK; Chadha, A (2005). "Preparation of biodiesel from crude oil of Pongamia pinnata". Bioresource Technology. 96 (13): 1425–9. doi:10.1016/j.biortech.2004.12.011. PMID 15939268.
  16. ^ Halder, P. K.; Paul, N.; Beg, M. R. A. (18 December 2014). "Prospect of Pongamia pinnata (Karanja) in Bangladesh: A Sustainable Source of Liquid Fuel". Journal of Renewable Energy. 2014: 1–12. doi:10.1155/2014/647324.
  17. ^ Kesari, Vigya; Rangan, Latha (September 2010). "Development of Pongamia pinnata as an alternative biofuel crop — current status and scope of plantations in India". Journal of Crop Science and Biotechnology. 13 (3): 127–137. doi:10.1007/s12892-010-0064-1. S2CID 2790680. Retrieved 23 July 2021.
  18. ^ "On Biodiesel". Archived from the original on April 26, 2012. Retrieved 2013-09-28.
  19. ^ Scott, Paul T.; Pregelj, Lisette; Chen, Ning; Hadler, Johanna S.; Djordjevic, Michael A.; Gresshoff, Peter M. (2008). "Pongamia pinnata: An Untapped Resource for the Biofuels Industry of the Future". BioEnergy Research. 1: 2. doi:10.1007/s12155-008-9003-0. S2CID 37994181.
  20. ^ Heuzé V., Tran G., Delagarde R., Hassoun P., Bastianelli D., Lebas F., 2017. Karanja (Millettia pinnata). Feedipedia, a programme by INRA, CIRAD, AFZ and FAO.