Llwyn blodeuol sy'n hannu o'r is-drofannau yw Mandon fach sy'n enw benywaidd. Mae'n perthyn i'r teulu Rubiaceae. Yr enw gwyddonol (Lladin) yw Asperula cynanchica a'r enw Saesneg yw Squinancywort.[1] Ceir enwau Cymraeg eraill ar y planhigyn hwn gan gynnwys Mandon Fechan, Mandon Lleiaf.
Gelwir y teulu Rubiaceae yn 'deulu'r coffi' ar lafar. Ar wahân i goffi ceir aelodau eraill o'r teulu sy'n sy'n cyfrannu'n helaeth i economi gwledydd e.e. O'r planhigyn Cinchona, y daw quinine. Mae gan y planhigyn hwn ddail syml, cyflawn, cyferbyn â'i gilydd, coronigau tiwbaidd ac ofari isradd.
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