Current Issue: Volume 33

Updates to Western Australia’s vascular plant census for 2021

PARKER, C.M. AND PERCY-BOWER, J.M., Nuytsia 33 : 1–14 (2022)

Stylidium milleri (Stylidiaceae), a striking discovery from south-western Australia

WEGE, J.A., Nuytsia 33 : 15–18 (2022)

Drummondita billyacatting (Rutaceae), a new, range-restricted species from Western Australia

SHELTON, L.R.J. AND THIELE, K.R., Nuytsia 33 : 19–27 (2022)

The new species Drummondita billyacatting L.R.J.Shelton & K.R.Thiele is described for a taxon previously phrase-named as D. sp. Trayning (A.M. George 97), which is narrowly endemic to Billyacatting Hill in the Western Australian wheatbelt. The new species is morphologically readily separable from the widespread D. hassellii (F.Muell.) Paul G. Wilson and the morphologically rather similar D. longifolia (Paul G. Wilson) Paul G. Wilson. A key is provided to all species of Drummondita Harv. (Rutaceae).

The Button Mangrove Conocarpus erectus (Combretaceae) is naturalised in Western Australia

KEIGHERY, G.J. AND LONG, V., Nuytsia 33 : 29–33 (2022)

The correct name for the weedy Homalanthus (Euphorbiaceae) in Western Australia

KEIGHERY, G.J. AND MITCHELL, A.A., Nuytsia 33 : 35–37 (2022)

Austrostipa (Poaceae) in Western Australia: new species, new records, keys, and character notes

WILLIAMS, A.R., Nuytsia 33 : 39–101 (2022)

Austrostipa S.W.L.Jacobs & J.Everett is a monophyletic genus of temperate Australian native grasses that occur throughout the southern part of the continent and in New Zealand. Eight new species from Western Australia are described and illustrated here, plus two newly recorded species that are range extensions from their previously known habitats in South Australia, bringing the total number of species recorded in this state to forty-four. Detailed character notes and a key to the species and the accepted subgenera are provided. The new species are: A. anaiwaniorum A.R.Williams, A. burgessii A.R.Williams, A. everettiana A.R.Williams, A. frankliniae A.R.Williams, A. heteranthera A.R.Williams, A. koordana A.R.Williams, A. nunaginensis A.R.Williams and A. turbinata A.R.Williams. One former species (A. nullanulla J.Everett & S.W.L.Jacobs) has been reduced to synonymy with A. vickeryana J.Everett & S.W.L.Jacobs. The two species with range extensions are A. echinata (Vickery, S.W.L.Jacobs & J.Everett) S.W.L.Jacobs & J.Everett, which has been found at several sites around Esperance, and A. mundula (J.M.Black) S.W.L.Jacobs & J.Everett, which has been found in numerous small isolated coastal pockets around the south-west and up as far as Yanchep north of Perth. Five of the new species appear to be rare and isolated, including the newly discovered populations of A. echinata and A. mundula, and warrant conservation priority.

Exocarpos capnodioides (Santalaceae), a new species from southern Australia allied to E. aphyllus

LEPSCHI, B.J., Nuytsia 33 : 103–111 (2022)

From Engler to APGIV: a short history of the botanical arrangement of the Western Australian Herbarium collections

PARKER, C.M., PERCY-BOWER, J.M. AND JAMES, S.A., Nuytsia 33 : 113–141 (2022)

The status of Albizia lebbeck (Fabaceae: Mimosoideae) in Western Australia

KEIGHERY, G.J., Nuytsia 33 : 143–146 (2022)

Reassessment of the type collections of W. Fitzgerald’s Calandrinia tepperiana (Montiaceae) leads to the discovery of a putative new species from the Kimberley

OBBENS, F.J., Nuytsia 33 : 147–148 (2022)

An expanded circumscription and revision of the Western Australian genus Balaustion (Myrtaceae: Chamelaucieae: Hysterobaeckeinae)

RYE, B.L., Nuytsia 33 : 149–204 (2022)

Balaustion Hook. s. lat. comprises 18 species that are characterised by having a large cavity on the inner surface of their seeds. Other characters found in all or most of the species are a low growth form, sub-epidermal tissue on the young stems that disintegrates into fibres, one-flowered peduncles, scarcely keeled sepals, and very large, sessile placentas. The type species of Balaustion has a distinctive anther type and particularly large, colourful flowers adapted to bird-pollination, but white is the most common petal colour in the genus. New combinations are made for three species previously included in Baeckea L. s. lat.: Balaustion exsertum (S.Moore) Rye, B. grandibracteatum (E.Pritz.) Rye and B. grande (E.Pritz.) Rye. A neotype is selected for Baeckea grandibracteata E.Pritz. and lectotypes chosen for B. grandis E.Pritz. and the type species Balaustion pulcherrimum Hook. The new species and subspecies are B. baiocalyx Rye, B. bimucronatum Rye, B. filifolium Rye, B. grandibracteatum subsp. meridionale Rye, B. grandibracteatum subsp. juncturum Rye, B. hemisphaericum Rye, B. interruptum Rye, B. karroun Rye, B. mukinbudin Rye, B. multicaule Rye, B. polyandrum Rye, B. quinquelobum Rye, B. spenceri Rye, B. tangerinum Rye, B. thamnoides Rye and B. unguiculatum Rye. Most of these taxa are conservation-listed in Western Australia. Three sections are recognised: sect. Balaustion is monotypic, sect. Nonfibrosa Rye comprises three species with few ovules, and sect. Tilophloia Rye comprises 14 species characterised by stem tissue that tends to disintegrate into numerous fibres. One possible case of hybridisation between two of these sections is discussed.