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 '''Maatulunga''', Citron is a straggly, evergreen shrub or small tree growing . It grows up to 4 metres tall. It is considered to be a delicate plant and the most tender of the cultivated Citrus species. 

The peel contains coumarins, limettin, scoparone, scopoletin and umbelliferon; besides nobiletin, limonin diosmin, beta-sitosterol and beta-Dglucoside. The roots contain campesterol, stigmasterol, sitosterol and cholesterol. <ref name="Chemical composition"/>

{{Common names|kn=daeva Daeva maadala, maada Maada vaala, maadalaMaadala, maathu Maathu langa, mahaaphalaMahaaphala|ml=Ganapathi-naragam, Kottanaranga, Madulungam|sa=maha-jambirakaruna, mahnimbuMahnimbu, matalungaMatalunga, matungaMatunga, vanabijapuraVanabijapura|ta=elumichaiElumichai, karuncalikamKaruncalikam, narattaiNarattai|te=beeja Beeja pooramu, dabba Dabba chettu, lungamuLungamu, maadiphalamuMaadiphalamu|hi=limbuLimbu, narangiNarangi, neembuNeembu|en=Citron}}

{{Leaf|Simple|alternateAlternate|spines Spines axillary, stout, sharp, ca 3.5 cm long. Leaves alternate, simple, variable, obtuse at base, crenate at margin, acute at apex, 10-18 x 3-9 cm, glabrous; petioles 8-10 mm long, not winged or jointed above. }}<ref name="Leaf"/>

{{Flower|Bisexual|Axillary racemes|White|35-40| Calyx urceolate, 4-lobed; lobes ca 3.5 mm long. Petals 4, oblong, 2-4 x ca 1 cm, purplish. Stamens 35-40; filaments polyadelphous, short-pubescent, white; anthers linear, 4.5-5 mm long, yellowish. Ovary cylindric, ca 8 x 4 mm, 12-loculed; style cylindric, 10-15 mm long, purplish; stigma globose, sticky.}}

 Citron trees are grown readily from cuttings taken from branches 2 to 4 years old and quickly buried deeply in soil without defoliation.