Taxonomic changes in six Western Australian genera of subtribe Hysterobaeckeinae (Myrtaceae: Chamelaucieae)
RYE, B.L.
Six genera belonging to the subtribe Hysterobaeckeinae Rye & Peter G.Wilson of Myrtaceae tribe Chamelaucieae DC. are updated to allow a more comprehensive coverage of them in the electronic Flora of Australia. The anther morphology of these genera is described, and the distinguishing characteristics of their diaspores are discussed and illustrated. Six poorly known, geographically restricted new species are described for the genera Anticoryne Turcz., Babingtonia Lindl., Scholtzia Schauer and Tetrapora Schauer as A. pallinup Rye, A. vallicola Rye, B. latifolia Rye, S. hortiorum Rye, S. nolba Rye and T. ostentata Rye, and one better known, but still geographically restricted, species is named S. viatica Rye. In Hysterobaeckea (Nied.) Rye, a species that had previously been included under Malleostemon J.W.Green with the phrase name M. sp. Officer Basin (D. Pearson 350) is described as H. uniloculata Rye, expanding the definition of Hysterobaeckea to include a 1-locular ovary, and a second new species is named H. lubrica Rye. One new species of Malleostemon is named as M. sparsus Rye now that additional material is available for it, although it may prove to be a hybrid. Scholtzia umbellifera F.Muell. and S. sp. Folly Hill (M.E. Trudgen 12097) are reduced to synonymy under S. obovata (DC.) Schauer, and the subspecies of S. brevistylis Rye are abandoned. Two phrase-named taxa under Baeckea L. are transferred to the appropriate genera to become Babingtonia sp. Dandaragan (G. Paczkowska s.n. PERTH 08245606) and Tetrapora sp. Youndegin Hill (A.S. George 15772). The new combination Tetrapora leptophylla (Turcz.) Rye is made based on Harmogia leptophylla Turcz., with lectotypifications for both this name and its synonym Baeckea floribunda Benth. Lectotypes are also nominated for Babingtonia camphorosmae (Endl.) Lindl., Scholtzia eatoniana (Ewart & Jean White) C.A.Gardner, S. involucrata (Endl.) Druce and S. laxiflora Benth. New or updated species keys and new descriptions of previously named species or genera are included where appropriate. The ten newly named species occur in the southern half of Western Australia and nine of them have conservation priority, including one that is presumed to be extinct.
