Lemun tsami, (Citrus limon) (L.) Osbeck, wani nau'i ne na kananan bishiyun bishiyu a cikin dangin furenni, Rutaceae, asalinsu daga Kudancin Asiya, a Arewacin gabashin India . 'Ya'yan itãcensa, zagaye suke kamar kwallo. Ana amfani da 'ya'yan itacen dake da launin rawaya ellipsoidal don abubuwan da ba don dafuwa ba a duk faɗin duniya, da farko don ruwan' ya'yan itacen, wanda ke da amfani iri biyu don sha da wanke abu. Ana kuma amfani da daskararren itace da fata a dafa abinci da yin burodi. Ruwan lemun tsami kusan 5% zuwa 6% citric acid ne, tare da pH na kusan 2.2, suna ba shi dandano mai tsami. Ya banbanta da ɗanɗano ruwan lemun tsami ya sa ya zama babban abin amfani a cikin abubuwan sha da abinci irin su lemonade da lemon meringue kek . Ba a san asalin lemun tsami ba, kodayake ana tunanin lemons ya fara girma a Assam (yanki a arewa maso gabashin Indiya ), arewacin Burma ko China . Binciken kwayoyin halittar lemun tsami ya nuna itace hade tsakanin lemu mai zaki (lemon zaki ) da citron .