Vestris is a true plural referring to Carus and other poets who might be inspired by Germanicus' exploits. For this use of uester to address one member of a collectivity, see Austin on Aen I 140 and Fordyce on Catullus XXIX 20.
45. VINCTO is my restoration for the manuscripts' CAPTO, which I am unable to construe with catenis. Vincto was first corrupted to uicto, which was then displaced by the gloss capto. For the picture compare AA I 215 'ibunt ante duces onerati colla catenis'; for uincto compare Livy VII 27 8 'eos uinctos consul ante currum triumphans egit', and for uincto ... catenis compare Caesar BG I 53 'trinis catenis uinctus'.
47. PVERI. The sons of Germanicus: Nero, Drusus III, and Gaius Caligula.
47. VOTVM COMMVNE DEORVM. Wheeler translates 'the source of universal prayers to the gods'. But it seems difficult to take uotum in this sense, and impossible to construe deorum. André translates 'c'est le voeu de tous les dieux', but it seems strange to have gods forming a uotum. Postgate placed a comma before deorum; but Germanicus and Agrippina were not gods. Heinsius conjectured SVORVM, but this seems rather forced. I suspect that deorum is correct, the sense of the passage being close to that of Fast II 63-64 'templorum positor, templorum sancte repostor, / sit superis opto mutua cura tui'; but what originally stood in place of uotum is not clear.
48. QVOS LAVS FORMANDOS EST TIBI MAGNA DATOS. 'Whose entrustment to you for education is an immense honour'. For the construction Ehwald (KB 68) cites Aen IX 92 (Cybebe asks that Aeneas' ships be rescued from fire) 'prosit nostris in montibus ortas', 'let it profit them that it was in my mountains that they had their origin' (Jackson Knight).
49. MOMENTA. 'Influence'. Compare Caesar BC III 70 2 'ita paruae res magnum in utramque partem momentum habuerunt', Livy I 47 6, Hor Ep I x 15-16 'ubi gratior aura / leniat et rabiem Canis et momenta Leonis', and Manilius II 901 (of the fifth temple) 'hic momenta manent nostrae plerumque salutis'.
49. MOMENTA Vaticanus 1595 (saec xv), sicut coni Scaliger et Gronouius MONIMENTA BCMFHILT. Similarly, most manuscripts have monimenta at Met XI 285-86 (Ceyx to Peleus) 'adicis huic animo ['my kindly nature'] momenta potentia, clarum / nomen auumque Iouem'.
49-50. SALVTI, / QVAE NISI MVTATO NVLLA FVTVRA LOCO EST. A similar qualification of salus at Met IX 530-31 'quam nisi tu dederis non est habitura salutem / hanc tibi mittit amans'; Bömer ad loc cites other word-plays with salus at Her IV 1, XVI 1 & XVIII 1, and at Tr III iii 87-88.
50. MVTATO ... LOCO. See at viii 86 qui minus ... distet ([p 284]).