Summary
Olearia exilis S.Moore var. subacuta J.Kost. is considered conspecific with Olearia dibrachiata D.J.N.Hind & R.J.Johns following a re-examination of both Koster’s protologue diagnosis and its type (and paratype) material.
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Introduction
Following publication of the Contribution on Olearia dibrachiata D.J.N.Hind & R.J.Johns (Compositae: Astereae: Hinterhuberinae) (Hind & Johns 2014), I prepared to return loan material to L. I have once again re-examined the type material of Koster’s Olearia exilis S.Moore var. subacuta, Koster’s protologue (Koster 1966: 535), and the two paratypes (Eyma 4993 and Wissel 183). I realised that the same style of problem that existed for Novaguinea rudalliae D.J.N.Hind (Hind 2005) remained true for Olearia dibrachiata — that Koster’s infraspecific protologue diagnosis and placement of taxa needed reconsidering. Koster’s variety, in possessing an abaxial leaf indumentum of a two-layered, ‘regularly aligned, malpighiaceous ‘T’-shaped hairs’ with interspersed very short-stipitate glands, and the regularly remotely finely-denticulate to dentate-spinous leaf margins, I now consider conspecific with Olearia dibrachiata.
The following synonymy is now proposed for Olearia dibrachiata. Herbarium acronyms are according to Thiers (2023).
Olearia dibrachiata D.J.N.Hind & R.J.Johns (2014: 1).
Olearia exilis S.Moore var. subacuta J.Kost. (Koster 1966: 535), synon. nov. Type: ‘Central New Guinea: Wissel Lakes, Enarotali, 1939, Eyma 5082’. Holotype L(0002175)!; isotype: BO.
material examined: PAPUA (INDONESIA). Wissel Lakes Region, 31 July 1939, Eyma 4993 (BO!, L!); Wissel Lakes Region, Enarotali, 1750 m, 8 Aug. 1939, Eyma 5082 (holotype L(0002175)!, isotype: BO); Mt Carstenz, Camp XX, Bijersberg, 3200 – 3600 m, Nov. – Dec. 1936, Wissel 183 (BO!).
References
Hind, D. J. N. (2005). Novaguinea (Compositae: Astereae: Lagenophorinae) – a taxonomic note. Contributions to the Flora of Mount Jaya, XVI. Kew Bull. 60 (4): 603 – 604. https://www.jstor.org/stable/25070248
____ & Johns, R. J. (2014). Olearia dibrachiata (Compositae: Astereae: Hinterhuberinae), a new species from Papua (Indonesia). Contributions to the Flora of Mount Jaya, XX. Kew Bull. 69 (2)-9515: 1 – 7. https://doi.org/10.1007/S12225-014-9515-Z
Koster, J. Th. (1966). The Compositae of New Guinea. 1. Nova Guinea, Bot. 24: 497 – 614. [Astereae: 524 – 612; Olearia: 525 – 555]]
Thiers, B. M. (2023). Index Herbariorum. https://sweetgum.nybg.org/science/ih/
Acknowledgements
The author would like to thank the Curators of both BO and L for providing the original loans to Bob Johns as part of my involvement in producing the Compositae account for A Guide to the alpine and subalpine Flora of Mt Jaya.
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Hind, D.N. Olearia dibrachiata (Compositae: Astereae: Hinterhuberinae): a taxonomic note. Contributions to the Flora of Mount Jaya, XXII. Kew Bull 79, 457–458 (2024). https://doi.org/10.1007/s12225-024-10187-3
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DOI: https://doi.org/10.1007/s12225-024-10187-3