The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s flora taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not currently being reflected in Florabase, herbarium collections, or the census. The project team is now conducting testing of the migrated data, and a further update will be provided by the end of the financial year (1 July). Please reach out to us if you have any questions or concerns.
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A taxonomic revision of Eucalyptus striaticalyx W. Fitzg. sens. lat. has been undertaken based on morphological characteristics observed through field studies, herbarium research and seedling trials. E. striaticalyx W. Fitzg. subsp. striaticalyx, from the northern goldfields and E. clelandii F. Muell. from the central goldfields of Western Australia are treated and new taxa are described here as E. striaticalyx subsp. delicata Nicolle & P.J. Lang, restricted to a couple of lunette systems in the northern goldfields of Western Australia, E. gypsophila Nicolle, widespread in the Great Victoria Desert of Western Australia and South Australia, with remnant populations extending to the Gascoyne Region of Western Australia, E. repullulans Nicolle from the Pilbara area of Western Australia, and E. canescens Nicolle (with subsp. canescens and subsp. beadellii Nicolle), apparently endemic to the southern Great Victoria Desert of South Australia. Keys, maps and representative illustrations for all the described species are provided.
A review of Eucalyptus calycogona (Mrytaceae) including the description of three new taxa from southern Australia
A key and distribution map for all taxa of Eucalyptus ser. Orbifoliae Brooker & Hopper are provided. Eucalyptus minniritchi Nicolle is described to accommodate populations of mallees in central Australia previously referred to as E. orbifolia F. Muell. or E. websteriana Maiden and related to both. The new species differs from E. orbifolia in the smaller buds with a short hemispherical operculum, the smaller and narrower adult leaves and the generally smaller, hemispherical fruits and differs from E. websteriana in the consistently and strongly pruinose adult parts and generally coarser leaves, peduncles, pedicels, buds and fruits. E. lata L.A.S. Johnson & K.D. Hill, a species recently described to accommodate what is here recognized to be typical E. orbifolia, is synonymised with that earlier named species. The status of E. educta L.A.S. Johnson & K.D. Hill and its relationship to E. orbifolia is discussed.
A revision of Eucalyptus series Calcicolae (Myrtaceae) from the south coast of Western Australia
Eucalyptus series Calcicolae Brooker consists of four closely related taxa, two of which are newly described. E. calcicola Brooker subsp. calcicola is restricted to the Hamelin Bay area on the Leeuwin Coast, and subsp_. unita_ Nicolle subsp. nov. occurs in scattered populations from west of Denmark eastwards towards Bremer Bay. E. ligulata Brooker subsp. ligulata occurs from Cape Le Grand to Cape Arid, and subsp. stirlingica Nicolle subsp. nov. is restricted to the Stirling Range. A key and distribution map for the taxa of Eucalyptus ser. Calcicolae are presented.
Two new species of silver mallet (Eucalyptus - Myrtaceae) of very restricted distribution in south-western Western Australia
Eucalyptus rugulata Nicolle sp. nov. is described from the South Ironcap-Hatter Hill area north-east of Lake King, distinguished within the silver mallets by its broad and thick adult leaves and the large and robust buds and fruits. E. purpurata Nicolle sp. nov. is described from a single population near Bandalup Hill east of Ravensthorpe. It is distinguished from E. argyphea L.A.S. Johnson & K.D. Hill by the conspicuous red-purple new growth and the smaller buds and fruits. Both new species are of restricted distribution and E. purpurata, in particular, is considered to be at risk. A key and distribution map for the silver mallets are presented.
A rare and endangered new subspecies of Eucalyptus sargentii (Myrtaceae) with high potential for revegetation of saline sites from south-western Australia and notes on E. diminuta and E. sargentii subsp. fallens
Eucalyptus sargentii subsp. onesia Nicolle subsp. nov. is described. It is known from less than ten small populations in the central wheatbelt of southwest Western Australia, with all populations occurring on highly saline sites and possibly endangered by increasing salinisation. E. sargentii subsp. onesia differs from subsp. sargentii primarily in the lignotuberous, mallee habit, making it preferable to subsp. sargentii for salt reclamation projects, due to its propensity to regenerate following fire or cutting. Extensive field examination, seedling trials and observations of cultivated material have indicated that E. sargentii subsp. fallens is not specifically distinct from E. diminuta and I regard the former as synonymous with the latter. E. diminuta is recircumscribed to include populations from Eurardy Station in the north to near Watheroo in the south.
Re-assessment of the saline-dwelling Eucalyptus spathulata complex (Myrtaceae) from southern Western Australia
NICOLLE, D. AND BROOKER, M.I.H., Nuytsia15 (3): 403–430 (2005)
The circumscription of taxa within the Eucalyptus spathulata complex is revised. The status of E. vegrandis is resolved and the new species E. orthostemon Nicolle & Brooker is described to accommodate populations of mallees previously and erroneously referred to E. vegrandis. The new taxon E. vegrandis subsp. recondita Nicolle & Brooker is described to accommodate coarse, relatively broad-leaved mallees in the Stirling Range area, previously referred under the manuscript name E. ‘recondita’. E. suggrandis is recircumscribed, with subsp. alipes (as to the type – the mallet/obligate seeder variant) raised to specific status as E. alipes (L. Johnson & K. Hill) Nicolle & Brooker. E. mimica is recircumscribed as an obligate seeder (mallet) species and E. suggrandis subsp. promiscua Nicolle and Brooker described from the Lake Grace – Pingrup area, previously being confused with both E. mimica and E. suggrandis. The new subspecies, E. spathulata subsp. salina Nicolle & Brooker, is described from mallets restricted to the Salt River drainage system of the northern part of the southern wheatbelt. E. cernua is recircumscribed as an obligate seeder (mallet) species with resprouter (mallee) populations, previously included under E. cernua, published as E. proxima Nicolle & Brooker. The manuscript name E. ‘verruculosa’ is considered to be E. suggrandis subsp. suggrandis, as to the proposed type. A key and distribution maps for the E. spathulata complex are provided.
Formal recognition of Eucalyptus platydisca (Myrtaceae), an arid-zone monocalypt from south-western Australia
NICOLLE, D. AND BROOKER, M.I.H., Nuytsia16 (1): 87–94 (2006)
The new species Eucalyptus platydisca is formally described, the species having been long recognised as a distinct taxon under the manuscript name E. platydisca and under various phrase names including the common name Jimberlana mallee. The new species is known from just two populations near Norseman in Western Australia and is included in Western Australia’s Schedule of Declared Rare (Endangered) Flora. The new species is closely related to, but readily distinguishable from, E. diversifolia, differing in the narrower juvenile leaves, the consistently 7-flowered inflorescences, the longer, conical to horn-shaped operculum, the broader fruits with a consistently broad disc and the granite hill habitat. Eucalyptus platydisca is probably a relictual species and occurs in the lowest rainfall environment of any monocalypt (Eucalyptus subgenus Eucalyptus). The new species is part of E. subser. Neuropterae, and a key for the subseries is presented.
Diamond gum (Eucalyptus rhomboidea: Myrtaceae), a new threatened species endemic to the Bremer Range of the Southwest Australian Floristic Region
HOPPER, STEPHEN D. AND NICOLLE, D., Nuytsia17: 185–194 (2007)
Eucalyptus rhomboidea Hopper & D.Nicolle, first collected by the late Ken Newbey in 1979, is described as new. The species is a member of Eucalyptus ser. Subulatae Blakely allied to E. transcontinentalis Maiden. It is confined to the Bremer Range, and it is at risk from present and proposed mining activities.
A new geographically disjunct and apparently rare subspecies of Eucalyptus jutsonii (Myrtaceae) from Western Australia
NICOLLE, D. AND FRENCH, M.E., Nuytsia17: 281–288 (2007)
The newly discovered subspecies E. jutsonii Maiden subsp. kobela D.Nicolle & M.E.French is described, differing from the typical subspecies in the narrower adult leaves, the generally more slender flower buds with a more pointed operculum and the slightly smaller fruits. The new subspecies is disjunct from the typical subspecies by over 400 kilometres and is known from a single site spanning approximately five kilometres. Eucalyptus jutsonii subsp. kobela may be under threat from mining-related activity and the subspecies meets the criteria for listing as Priority One under the Conservation Codes for Western Australian Flora. A key to E. ser. Micrantherae is included.
An updated diagnosis for Eucalyptus series Accedentes (Myrtaceae) and a new mallee species for the series occurring in far western Australia
NICOLLE, D. AND BROOKER, M.I.H., Nuytsia18: 189–196 (2008)
Eucalyptus L'Hér. ser. Accedentes Chippend. is diagnosed by an exclusive combination of characters for the first time. The series consists of nine species, all but one of which are endemic to Western Australia, including the newly described Eucalyptus baiophylla D.Nicolle & Brooker, a mallee occurring between Exmouth and Carnarvon on the west coast of Australia. The new species was formerly included in E. prominens Brooker and is most closely related to E. zopherophloia Brooker & Hopper. A key to the series is included and a map and illustrations of the new species are provided.
A revision of Eucalyptus ser. Cornutae subser. Conjunctae (Myrtaceae) from the south coast of Western Australia, including the description of four new taxa and comments on the hybrid origin of E. bennettiae
NICOLLE, D.,FRENCH, M.E. AND MCQUOID, N.K., Nuytsia18: 197–222 (2008)
Eight terminal taxa are recognised in Eucalyptus L’Hér. ser. Cornutae (Benth.) Brooker subser. Conjunctae Brooker. Two new species are described, viz., E. sinuosa D.Nicolle, M.E.French & McQuoid, known from only a few populations in the Corackerup Creek area and in Fitzgerald River National Park, and E. retusa D.Nicolle, M.E.French & McQuoid, known from one or possibly two populations from near Bremer Bay. New subspecies described are E. lehmannii (Schauer) Benth. subsp. parallela D.Nicolle & M.E.French, which is the widespread variant of the species, occurring from the Stirling Range area eastwards to Cape Arid, and E. conferruminata D.Carr & S.Carr subsp. recherche D.Nicolle & M.E.French, the eastern variant of that species apparently endemic to the Recherche Archipelago and the common variant in cultivation across southern Australia. The distribution of E. arborella Brooker & Hopper is modified with the discovery of a new population and the exclusion of another population included in this species by others. The hybrid status of E. bennettiae D.Carr & S.Carr is discussed. A key to E. subser. Conjunctae is provided.
Four new obligate seeder taxa of Eucalyptus series Rufispermae (Myrtaceae) from the transitional rainfall zone of south-western Australia
Three new species are described, viz. E. vittata D.Nicolle, an obligate seeder previously confused with the respouter species E. sheathiana Maiden and also differing from the latter in the narrower adult leaves and smaller buds and fruits_; E. frenchiana _ D.Nicolle_,_ an obligate seeder from between Norseman and Hyden, previously confused with E. corrugata Luehm. but most closely related to E. pterocarpa C.A.Gardner ex P.J.Lang and differing from the latter in the smaller leaves, buds and fruits and the hemispherical opercula; and E. distuberosa D.Nicolle_,_ an obligate seeder previously confused with the respouter species E. pileata Blakely_._ Two subspecies are recognized in E. distuberosa, viz. subsp. distuberosa, of widespread but scattered distribution in the southern goldfields, and subsp. aerata D.Nicolle, restricted to Bronzite Ridge west of Norseman. A key to the obligate seeder taxa of E. ser_._ Rufispermae Maiden is provided.
Eucalyptuscalycogona subsp. miracula (Myrtaceae), a new subspecies from the central wheatbelt of Western Australia
NICOLLE, D. AND FRENCH, M.E., Nuytsia19 (1): 99–105 (2009)
A new subspecies of Eucalyptus calycogona Turcz.is described, differing from the other three subspecies of E. calycogona by the waxy branchlets, buds and fruits, the generally broader, dull adult leaves which are bluish at least when new, the consistently elliptical to ovate seedling leaves, and the generally larger flower buds and fruits. The new ubspecies is distributed on the eastern edge of the central wheatbelt in Western Australia, to the north-west of the distribution of subsp. calycogona. A key to E. ser_. Heterostemones_ Benth., a map indicating the distribution of E. calycogona in Western Australia, and illustration of the holotype and habit of E. calycogona subsp. miracula D.Nicolle & M.E.French are included.
Two new mallee box species (Eucalyptus sect. Adnataria ser. Lucasianae; Myrtaceae) from the Pilbara region of Western Australia
NICOLLE, D. AND FRENCH, M.E., Nuytsia22 (1): 17–29 (2012)
Two new species are described, both which have previously been included in E. lucasii Blakely, viz: E. aridimontana D.Nicolle & M.E.French sp. nov., known from high mountain ridges of the Hamersley Range, and E. rowleyi D.Nicolle & M.E.French sp. nov., known from plains of the De Grey River catchment to the north-east of the Hamersley Range. Both species differ from E. lucasii in their adult leaves which age to green and/or glossy, and in their thickened pedicels and peduncles (among other characteristics). Eucalyptus lucasii, as now circumscribed, is a widespread species restricted to watercourses and flood-out plains south of the Pilbara region. A key to E. ser. Lucasianae Chippend. and distribution maps for E. lucasii, E. aridimontana and E. rowleyi are provided.
Notes on the identity and status of Western Australian phrase names in Corymbia and Eucalyptus (Myrtaceae)
NICOLLE, D.,FRENCH, M.E. AND THIELE, K.R., Nuytsia22 (3): 93–110 (2012)
A total of 27 phrase names in Corymbia K.D.Hill & L.A.S. Johnson (1) and Eucalyptus L'Hér. (25) which occur at least partly in Western Australia have been assessed with respect to their identity and status. Of these 27 phrase names, we recommend that 14 be removed from duplicate names (taxonomically matching another phrase name or published taxon), are taxonomically indistinct or very poorly understood, or are considered to represent hybrids. We erect eight new phrase names for Eucalyptus in Western Australia.
A revision of Eucalyptus ser. Falcatae (Myrtaceae) from south-western Australia, including the description of new taxa and comments on the probable hybrid origin of E. balanites, E. balanopelex and E. phylacis
NICOLLE, D. AND FRENCH, M.E., Nuytsia22 (6): 409–454 (2012)
Twenty terminal taxa (including 18 species) are recognised in Eucalyptus ser. Falcatae. Brooker & Hopper. We include the monotypic E. ser. Cooperianae L.A.S.Johnson ex Brooker (E. cooperiana F.Muell.) in the series. The new species E. annettae D.Nicolle & M.E.French and E. opimiflora D. Nicolle & M.E.French and the new subspecies E. goniantha Turcz. subsp. kynoura D.Nicolle & M.E.French are described. New combinations made are E. adesmophloia (Brooker & Hopper) D.Nicolle & M.E.French, E. ecostata (Maiden) D.Nicolle & M.E.French and E. notactites (L.A.S.Johnson & K.D.Hill) D. Nicolle & M.E.French. The circumscription of some taxa is significantly modified from previous accounts, including that of E. falcata Turc E. goniantha and E. obesa Brooker & Hopper. The name E. dorrienii Domin is resurrected to accommodate populations of mallees previously erroneously called E. falcata. We reject the status of the following previously accepted taxa: E. argyphea L.A. S.Johnson & K.D.Hill (= E. falcata), E. balanites Grayling & Brooker (= E. decipiens × E. lane-poolei), E. balanopelex L.A.S.Johnson & K.D.Hill (= E. semiglobosa × E. kessellii subsp. eugnosta), E. communalis Brooker & Hopper (= E. adesmophloia – E. obesa intergrade), E. decipiens subsp. chalara Brooker & Hopper (= E. decipiens – E. adesmophloia intergrade) and E. phylacis L.A.S.Johnson& K.D.Hill (= E. decipiens × E. virginea). Distribution maps and representative images are provided where appropriate. A key to the taxa of E. ser. Falcatae is provided.
A review of Eucalyptus erythronema (Myrtaceae) from the wheatbelt of south-western Australia
NICOLLE, D. AND FRENCH, M.E., Nuytsia22 (6): 455–463 (2012)
Three taxa are recognised within the previously-accepted concept of E. erythronema Turcz_._ The taxon previously known as E. erythronema var. marginata (Benth.) Domin is regarded as specifically distinct and is here described as E. armillata D.Nicolle & M.E.French. The taxon previously known as E. erythronema var. erythronema has two variants: a north-eastern variant with conspicuously waxy branchlets and usually red flowers, which we recognise as E. erythronema subsp. erythronema, and a south-western variant with non-waxy branchlets and consistently pale creamy yellow flowers, which we describe as E. erythronema subsp. inornata D.Nicolle & M.E.French_._ A distribution map for the three taxa previously included in E. erythronema and a key to E. ser. Elongatae Blakely (in which the three taxa treated here are included) are provided.
A new subspecies of the threatened monocalypt Eucalyptus insularis (Myrtaceae) from Western Australia
NICOLLE, D.,BROOKER, M.I.H. AND FRENCH, M.E., Nuytsia24: 249–253 (2014)
Two subspecies are here recognised in the geographically rare and taxonomically isolated Eucalyptus insularis Brooker. Eucalyptus insularis subsp. insularis is known only from North Twin Peak Island in the Recherche Archipelago, about 90 km east-south-east of Esperance. Eucalyptus insularis subsp. continentalis D.Nicolle & Brooker subsp. nov. is known only from several small populations near Cape Le Grand on the mainland, about 25 km south-east of Esperance, and differs from the type subspecies in its low shrubby habit, smaller adult leaves with obscure tertiary venation and irregularly-shaped oil glands, more strongly pendulous inflorescences, and its generally smaller buds and fruits.