Description of a new south-western Australian plant group, Hypocalymma sect. Grandiflora (Myrtaceae: Chamelaucieae: Astarteinae)
RYE, B.L., KEIGHERY, G.J. AND BARRETT, M.D.

A new section of Hypocalymma (Endl.) Endl., H. sect. Grandiflora Rye, Keighery & M.D.Barrett, is described. Like sect. Hypocalymma, the new section has seeds with a pitted testa, but it differs in having solitary axillary flowers with large petals greatly exceeding the length of the stamens. Its type species is H. puniceum C.A.Gardner and three of its five species are new: H. inopinatum Rye, Keighery & M.D.Barrett, H.magnificum Rye, Keighery & M.D.Barrett, and H. polyandrum Rye, Keighery & M.D.Barrett. Keys are given to the four sections of Hypocalymma and to the species of sect. Grandiflora. Four species have conservation priority.