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Kellermann&Barker Muelleria 2 Revision of the Spyridium bifidum – S. halmaturinum complex (Rhamnaceae: Pomaderreae) from South Australia and Victoria Jürgen Kellermann1,2,3 & W.R. (Bill) Barker1,2 1 State Herbarium of South Australia, DENR Science Resource Centre, P.O. Box 2732, Kent Town, South Australia 5071; e-mail: [email protected]; [email protected] 2 Australian Centre for Evolutionary Biology and Biodiversity (ACEBB), School of Earth & Environmental Science, The University of Adelaide, South Australia 5005 3 Former address: National Herbarium of Victoria, Royal Botanic Gardens Melbourne, Birdwood Avenue, South Yarra, Victoria 3141 Abstract Introduction The Spyridium bifidum – Spyridium Fenzl. is one of the larger genera of Rhamnaceae in S. halmaturinum complex is revised; Australia. Comprising about 45 species, it is the third largest genus of the it consists of eight species and two Pomaderreae, a tribe endemic to Australia and New Zealand (Kellermann subspecies. Spyridium bifidum, et al. 2005; Kellermann & Udovicic 2008). The genus occurs in temperate S. coactilifolium and S. halmaturinum and semi-arid south-western and south-eastern Australia. Its main centre are maintained in revised circumscription. New combinations of distribution is in South Australia (currently 20 species), with a secondary and names are provided for S. bifidum centre in Western Australia (15 species). Only two species are shared subsp. wanillae, S. coalitum and between western and south-eastern Australia. There are eight species of S. scabridum. Spyridium stenophyllum Spyridium in Victoria, half shared with South Australia, six species in New is re-instated and transferred South Wales, one extending into south-eastern Queensland, and eight from Cryptandra to Spyridium. The following taxa are published as new: species in Tasmania (see Lepschi et al. 2011). S. fontis-woodii, S. furculentum and The last treatment of Spyridium for South Australia (Canning 1986) S. stenophyllum subsp. renovatum, recognised 14 species and six infraspecific taxa. Apart from the addition the last of which contains most of S. nitidum Wakef. and S. tridentatum (Steud.) Benth., Canning’s specimens previously referred to (1986) treatment repeated that by Black (1926, 1952) with a few minor as S. bifidum. All taxa are described, amendments. Since 1986 there have been several changes: Spyridium illustrated and typified; distribution maps are provided. tridentatum has been transferred back into the re-established genus Stenanthemum Reissek (Rye 1995a; Barker 2005; Thiele 2007) as Keywords: Australia, taxonomy, nomenclature, Rhamnaceae, St. tridentatum (Steud.) Reissek; Spyridium tricolor W.R.Barker & Rye and Pomaderreae, Spyridium. S. erymnocladum W.R.Barker have been newly described (Barker & Rye 1993, Muelleria 30(1): 26–58 (2012) Barker 1995), and S. waterhousei F.Muell., which had been long subsumed under Cryptandra Sm., has been re-instated (Kellermann 2007b). The last Spyridium treatment for Victoria (Walsh 1999) included seven species, one of which was not published at the time: Spyridium sp. 1. Two species endemic to the Grampians were later transferred from Trymalium to Spyridium (Kellermann 2006b): S. daltonii (F.Muell.) Kellermann and S. ×ramosissimum (Audas) Kellermann. 26 Vol 30(1) 2012 Revision of the Spyridium bifidum – S. halmaturinum complex This paper revises the S. bifidum – S. halmaturinum Later authors, including Bentham (1863), who complex, which mainly occurs in South Australia, but transferred Trymalium bifidum to Spyridium, Black (1926, also has one taxon endemic to Victoria. 1952) and Canning (1986), only accepted S. bifidum for all taxa with narrow, forked leaves, regardless of their Taxonomic history and discussion leaf indumentum or number of carpels. All previously In the treatments of Black (1926, 1952) and Canning mentioned authors, however, do not seem to have (1986) the Spyridium bifidum – S. halmaturinum species examined the flowers in detail or realised the diagnostic complex comprised two widespread polymorphic importance of floral characters, as none mentioned species, S. bifidum (F.Muell.) Benth., largely of mainland carpels or stigma number. South Australia and S. halmaturinum (F.Muell.) Benth. Mueller (1882) transferred all species of Spyridium, of Kangaroo Island, and a third species restricted to the Trymalium Fenzl and Stenanthemum into an enlarged vicinity of Victor Harbor, S. coactilifolium Reissek. The Cryptandra Sm., since he only accepted the genera two former species each contained several varieties. Cryptandra and Pomaderris Labill. in Pomaderreae at This treatment of the complex has been unsatisfactory that time (Kellermann 2007b). This was reversed by as several distinctive taxa with bilobed or emarginate later authors, apart from Stenanthemum, the species leaves have been referred to as ‘Spyridium bifidum’, of which had been subsumed under either Cryptandra while three varieties with the same epithet ‘integrifolium’ or Spyridium (e.g. Canning 1986) until Rye (1995a) have been used for entire-leaved variants of these re-instated the genus. bilobed taxa. Black (1925) described a distinct entire-leaved form The complex is here divided into two main groups of from near Wanilla as Spyridium bifidum var. integrifolium. taxa allied with S. bifidum and S. halmaturinum, following This variety is close to S. bifidum from Marble Range; traditional application of the names. it has a trilocular ovary and narrow entire leaves with antrorse simple hairs on the upper surface. Canning The Spyridium bifidum group (1986) erroneously listed its area of distribution as The first taxon to be described in this group was Kangaroo Island. Trymalium bifidum by Mueller (1855) from specimens During our studies it became apparent that these collected by Carl Wilhelmi on the Eyre Peninsula at taxa described in the Spyridium bifidum group are well Boston Point, just north of Port Lincoln, and at Marble defined and should be recognised. They are restricted Range. Reissek (1858) split Mueller’s T. bifidum into to the Marble Range (S. bifidum var. bifidum), to a range two species, describing the Boston Point collection as system near Wanilla (S. bifidum var. integrifolium), T. stenophyllum. He characterised this new species as and to the eastern Eyre Peninsula, mostly along or being more slender and having glabrous upper surfaces near the coast (Trymalium stenophyllum). The latter of the leaves. species is transferred by us in this paper to Spyridium Our observations confirm that specimens from these and the entire-leaved variety of S. bifidum is renamed two localities, only c. 50 km apart, are superficially similar as S. bifidum subsp. wanillae. However, the majority on account of the Y-shaped leaves and stipules that are of specimens from South Australia that have been fused for more than half of their length. However, the labelled as ‘Spyridium bifidum’ do not match any of the populations at Marble Range differ in several characters, named taxa, since they have the combination of narrow such as the presence of simple hairs on the upper Y-shaped leaves with antrorse hairs and bilocular surface of the leaves and very large, globular, head-like ovaries. They belong to a taxon that is clearly related to inflorescences. In comparison, the coastal taxon has S. stenophyllum as both taxa have a 2-carpellate ovary, narrower, glabrous leaves and smaller inflorescences. a condition that is very rare in the tribe Pomaderreae Furthermore, specimens from Boston Point have bifid (Kellermann et al. 2006); this new taxon is recognised stigmas and bicarpellate ovaries, in contrast to the here as S. stenophyllum subsp. renovatum. Marble Range specimens, which have trifid stigmas and Many entire-leaved specimens from Kangaroo trilocular ovaries. Island that have previously been labelled S. bifidum Muelleria 27 Kellermann and Barker var. integrifolium cannot be placed in any currently oblong, emarginate leaves with a moderately dense recognised species. They are somewhat similar to S. cover of long antrorse to spreading hairs. Notably, coalitum (see below), but differ in having glabrous Tate published the species with his collection name upper leaf surfaces and very large infructescences. The ‘Spyridium scabridum’ as a synonym. Evidently he had relationship of these specimens with S. thymifolium not been sure in which genus to place the taxon. It was Reissek, S. vexilliferum (Hook.) Reissek and S. coalitum is subsequently transferred to S. halmaturinum as var. currently under investigation. scabridum by Black (1926). In this paper we recognise it as a separate species in Spyridium. The Spyridium halmaturinum group Black (1925) described Spyridium halmaturinum var. Together with Trymalium bifidum, Mueller (1855) integrifolium from Kangaroo Island specimens with described T. halmaturinum based on collections from entire leaves that carried a similar indumentum to that Kangaroo Island and Encounter Bay. He believed that on the leaves of S. halmaturinum. All other species in the T. bifidum was similar to T. halmaturinum and might S. halmaturinum complex have free stipules. This taxon prove to be conspecific. As he did with T. bifidum, is here raised to specific rank as S. coalitum; it differs from Reissek (1858) split T. halmaturinum, segregating the typical S. halmaturinum in the presence of fused stipules mainland specimens from Encounter Bay as Spyridium and leaves that are oblong to narrowly elliptic. coactilifolium. He recognised the segregates in separate For many years, a taxon
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