Here's a more complete list of all the places the Hardened Sap of Kri'vess can be found:

/way Townlong Steppes 57.4, 56.7 Hardened Sap of Kri'vess
/way Townlong Steppes 57.5, 58.5 Hardened Sap of Kri'vess
/way Townlong Steppes 56.0, 55.5 Hardened Sap of Kri'vess
/way Townlong Steppes 55.6, 54.1 Hardened Sap of Kri'vess
/way Townlong Steppes 55.5, 61.0 Hardened Sap of Kri'vess
/way Townlong Steppes 53.8, 61.4 Hardened Sap of Kri'vess
/way Townlong Steppes 53.9, 58.4 Hardened Sap of Kri'vess
/way Townlong Steppes 52.8, 60.0 Hardened Sap of Kri'vess
/way Townlong Steppes 52.0, 58.7 Hardened Sap of Kri'vess
/way Townlong Steppes 52.5, 57.7 Hardened Sap of Kri'vess
/way Townlong Steppes 52.8, 56.2 Hardened Sap of Kri'vess
/way Townlong Steppes 52.6, 55.4 Hardened Sap of Kri'vess
/way Townlong Steppes 51.1, 57.3 Hardened Sap of Kri'vess
/way Townlong Steppes 50.9, 55.2 Hardened Sap of Kri'vess

This was compiled by Voxi on Wowhead ( https://www.wowhead.com/object=213959/hardened-sap-of-krivess#comments