x1 is a plum/peach/cherry/apricot/almond/sloe [fruit] (genus Prunus) of species/variety x2
zirsmela for plum, xunsmela for cherry, najysmela for peach, pelsmela for apricot, ri'orsmela for almond, blasmela for sloe. Cf. rutrprunu, ricrprunu, flaume, persika, rutrceraso, birkoku, frambesi, fragari, plise, perli, rozgu