text:  The _flattened disk_ of the sky-blue _Nana arborea_ contrasts with the _Betula sanguinea_ glowing deeply in the flower-bed of many lighter-coloured petals; the sweet-scented _African laurel_ grows against the long-leafed Babylonian willow which _susurrates_ droopingly over your head as if it were "by _the waters of Babylon_