Citrus ×junos Siebold ex Yu.Tanaka, in Sieb. Sens. Tor. Hyakun. Kin. Ronbunshu: 65 (1924) (syn: Citrus × aurantium f. verrucosa Makino ; Citrus × hsiangyuan Yu.Tanaka ; Citrus medica f. sudachi (Shirai) M.Hiroe ; Citrus × sechen Kokaya ; Citrus × sechen subsp. sjanchen Kokaya ; Citrus × sphaerocarpa Y.Nakaj. ex H.Ohba ; Citrus × sudachi Shirai ; Citrus × tamurana Takahashi ; Citrus × yuko Yu.Tanaka);
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Artificial cross is C. cavaleriei × C. maxima × C. reticulata.
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Citrus ×junos Siebold ex Yu.Tanaka: 5 very high res. images.
From where did you get the name?
What is the size of the fruit compared to that of a mosambi or lemon?
Book. Medium size lemon.
Which book?
I think it will be very difficult to identify a citrus with this only.
Lemon, (chook-amilo lemon) – Kaalo Jyamir – (कालो ज्यामीर) – Citrus junos Tanaka
https://www.promessedefleurs.ie/yuzu-citrus-junos.html
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References:
POWO Catalogue of Life