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{{Uses|common Common cold}}, {{Uses|coughCough}}, {{Uses|cancer Cancer}}, {{Uses|kidney Kidney stone}}, {{Uses|systolic Systolic blood pressure}}, {{Uses|acid Acid reflux}},{{Uses|gastritisGastritis}}, {{Uses|arthritisArthritis}}, {{Uses|gouty Gouty diathesis}}.

All parts of the plants of citrus sp. contain coumarins and psoralins. The fruits contain flavonoids and limonoids. The flavonoids comprise three main groups—flavanones, flavones and 3-hydroxyflavylium (anthocyanins); flavanones being predominantly followed by flavones and anthocyanins. Bitter flavonoids do not occur in lemon and lime. Lemon juice is a richer source of antiscorbutic vitamin (contains 40–50 mg/100 g of vitamin C) than lime, and a fair source of carotene and vitamin B. Volatile oil (about 2.5% of the peel) consists of about 75% limonene, alpha-and beta-pinenes, alpha-terpinene and citral. The fruit juice also contains coumarins and bioflavonoids.<ref name="chemical composition"/>

{{Common names|kn=Nimbe hannu|ml=|Nimbe hannusa=|ta=Elumichai|te=Nimma pandu|hi=Nimbu,Nilbu|en=ALime or Sour lime}}

{{Leaf|Simple|ovateOvate|margin Margin of leaves are conspicuously crenulate}}<ref name="Leaf"/>

{{Flower|Bisexual|2-4cm long|pale Pale yellow|5|Flowers solitary or several in fascicles}}

{{Fruit|ellipsoid Ellipsoid to ovoid|7–10 mm|Fruits are yellow, ellipsoid to ovoid, narrowed at both ends, surface usually coarse and lemon scented|apex Apex acute|Seeds ovoid}}

<ref name="chemical composition">[http://gbpihedenvis.nic.in/PDFs/Glossary_Medicinal_Plants_Springer.pdf "chemistry"Chemistry]</ref><ref name="Ayurvedic preparations">[https://liveayurvedalife.com/nimbuka-citrus-acida-roxb-ayurvedic-herb/ "Ayurvedic preparations"]</ref>

<ref name="Leaf">[http://eol.org/pages/582200/details "morphology"Morphology]</ref>

<ref name="How to plant/cultivate">[https://www.almanac.com/plant/lemons-oranges "planting Planting of lemon"]</ref>

* [https://plantvillage.psu.edu/topics/lemon/infos lemon Lemon on plant vilage.education]* [https://www.botanical-online.com/medicinalslimonangles.htm lemon Lemon tree on botonical online.com]* [https://www.britannica.com/plant/lemon lemon Lemon on encyclopedea britanicca]