Feast of St Joachim and Anna (July 26) - chants for Matins

Note that the invitatory antiphon and hymn provided for the feast in the Liber Responsorialis are not those used for the 1962 version of the feast.

Instead:

• the invitatory antiphon (Christum regem) can be found in the Liber Hymnarius, pg 585;
• the hymn, Gaude Mater, is in the Antiphonale Monasticum, pg 985;

I haven't been able to locate a chant source for the responsory, O clara stirps however (please let me know if you know of one!).