I can find no record of a plant named Antholyza flava.  The most likely possibility is a form of  Chasmanthe aethiopica (L.) N.E.Br., which see, perhaps var. minor, which has a perianth tube red at the top, bright yellow downwards.  [Baker Ir., BR f.1159/1829]. That is the plant figured here.  Likewise Chasmanthe floribunda (Salisb.) N.E.Br. var. Duckitii, with clear yellow flowers, should be considered.