Definition of "laurustinus"

We, Greville, are happy in these parks and forests: we were happy in my close winter-walk of box and laurustinus and mezereon. In our earlier days did we not emboss our bosoms with the crocusses, and shake them almost unto shedding with our transports!

1824, Walter Savage Landor, “Conversation II. Lord Brooke and Sir Philip Sidney.”, in Imaginary Conversations of Literary Men and Statesmen, volume I, London: […] Taylor and Hessey, […], pages 18–19

There it was true she had once met Melliphant; but conceiving it to be accidental, that no further intrusion would molest her, with a light foot she bounded along the winding path, where, on either side the box, the variegated holly and luxuriant laurustinus profusely clustered.

1838, [Letitia Elizabeth] Landon (indicated as editor), chapter VIII, in Duty and Inclination: […], volume III, London: Henry Colburn, […], page 98