Correspondence appended verbatim is pertinent to The Jepson Manual [Ed. 2] account: "Move to List 1B? Location, rarity, and endangerment information needed. See R. amarum in The Jepson Manual."
Correspondence 2 indicates that for The Jepson Manual [Ed. 2] Ribes amarum McClatchie var. hoffmannii Munz and Ribes amarum McClatchie var. amarum are to be treated as synonyms of Ribes amarum McClatchie.