t1=g1=r1 is an indehiscent fruit/seed-envelope (which remains closed/sealed and whole) of organism t2 with potential to produce/containing/enclosing offspring t3=g3 preventing passage to g2 (default: external environment)
r2 is assumed to be indefinite (indehiscent fruit must be processed/stimulated by active external means in order to release their seeds). There is no reason for the 'fruit' to necessarily be of a plant, although it probably will be.