A clarification of the generic limits of Olearia and Pleurophyllum (astereae-compositae)

Drury, D. G.

doi:10.1080/0028825x.1968.10428583

Cited by 25 publications

(13 citation statements)

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“…A few pollen grains were referred to the Olearia type in which is included pollen of Pleurophyllum hookeri and P. criniferum (Moar 1958;Drury 1968). Thus the present study contributes nothing to the question whether Olearia lyallii is a recent arrival at the Auckland Islands (Godley 1965).…”

Section: Discussionmentioning

confidence: 87%

Quaternary sediments and plant microfossils from Enderby Island, Auckland Islands

Fleming¹,

Mildenhall²,

Moar³

1976

Journal of the Royal Society of New Zealand

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At Enderby Island, a deposit of till, here named the Enderby Formation, locally separated into upper and lower members by lenses of laminated lake siltstone, overlies a sequence of flat-lying basalt flows, perhaps benched by ,the sea during an interglacial period of high sea level. Except on the coast these deposits are blanketed by zonal peat, 3 m thick, which contains the record of post-glacial vegetation.The Lower Till was deposited by the extended glacier that spread out from Laurie Harbour, at the head of Port Ross, flowing from the higher parts of the Ross Volcano when sea level was low, presumably during an early stadial of the last (or Otiran) glacial stage.The Laminated Siltstone (5 m), deposited in a pro-glacial meltwater lake dammed by moraine during a lateral swing or temporary retreat of the glacier, is injected by curious carrot-shaped structures of till, each apparently emplaced by the rapid sinking of a ma.'''11 of rock-laden iceberg which penetrated the unconsolidated silts to depths of almost two metres. The emplacement of such "till carrots" was contemporary with deposition of the silt. The ice re-advanced to deposit an Upper Till Member over the underlying members, locally deforming them and picking up siltstone clasts.The Laminated Siltstone and a clast of siltstone from the Upper Till contain pollen 'and spores indicating a cold-climate vegetation of dominant Compositae with associated herbs, grass, sedge and scrub (Coprosma, Dracophyllum, and Myrsine) but lacking Metrosideros and other trees of the present Auckland Island vegetation.The till members may represent two stadials of the last glaciation and the siltstone an interstadial between them, or they may merely represent fluctuations of minor significance.The blanket peat overlying the till sequence has three members, a lower peat with tree stumps, a middle sandy peat containing angular sand 'and subangular basalt clasts (up to 45 cm through), and an upper peat with scattered well-rounded basalt pebbles, identified as seal gastroliths. The sandy peat is tentatively attributed to the influence of blown sand advancing inland when the post-glacial sea (also represented by an elevated beach) first 'approached its maximum level.Four zones in the peat can be defined from pollen analysis. In Zone 1, woody elements (e.g. Myrsine, Coprosma) and Compositae are abundant, with sedge and grass, and at the top of the zone rooted stumps of Dracophyllum (underrepresented by pollen) gave a HC age of 8630 ± 80 yr BP. In Zone 2, Anisotome pollen increases, Myrsine, Coprosma and Olearia-type pollen grains decrease, Dracophyllum enters with various herbs, and persistent grass is dominant over sedge. In Zone 3, Metrosideros pollen is relatively common.Tillaea and sedges rise steeply as grass declines but Myrsine, Coprosma and Dracophyllum decrease. In Zone 4, grass increases once more (with Myosotis and Myrsine) while Bulbinella, Anisotome and woody shrubs decrease.The Metrosideros phase in Zone 3 (reflecting a warm interval from ca. 6000 to 3000 yr ...

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Section: Discussionmentioning

confidence: 87%

Quaternary sediments and plant microfossils from Enderby Island, Auckland Islands

Fleming¹,

Mildenhall²,

Moar³

1976

Journal of the Royal Society of New Zealand

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“…Antarcticae (Allan 1961) to genus rank as Damnamenia, arguing its one species lacked character states characteristic of mainland Celmisia, yet shared a number with Pleurophyllum and macrocephalous Olearia. The phenetic similarity of Damnamenia with Pleurophyllum and macrocephalous Olearia (Drury 1968;Given 1973) suggested relationships that have since been supported by explicitly phylogenetic methods and molecular data . The three species of Pleurophyllum are sister to a clade of six species of macrocephalous Olearia, with the monospecific Damnamenia as sister to these nine species (Cross et al 2002;.…”

Section: Celmisia-olearia Complex (Tribe Astereae)mentioning

confidence: 89%

“…The three species of Pleurophyllum are sister to a clade of six species of macrocephalous Olearia, with the monospecific Damnamenia as sister to these nine species (Cross et al 2002;. The distinctiveness of these mostly southern species of macrocephalous Olearia has long been recognised (Allan 1961) and Drury (1968) was first to ally them with Pleurophyllum.…”

Section: Celmisia-olearia Complex (Tribe Astereae)mentioning

confidence: 99%

Evidence-based review of the taxonomic status of New Zealand's endemic seed plant genera

Garnock‐Jones

2014

New Zealand Journal of Botany

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The nature, value and relative importance of different lines of evidence for deciding the circumscription and rank of genera are examined and discussed. First, I argue that the circumscriptions of genera (and higher taxa) should always be monophyletic, preferably with strong support from independent evidence. Second, the rank of genus is decided on more subjective grounds, but several criteria are helpful: phylogeny should be recoverable from the classification hierarchy, genera should be distinctive, ranks should not be redundant and familiar names should be retained if other criteria are met. I then apply these criteria to an evaluation of the circumscription and rank of 59 New Zealand endemic genera of seed plants accepted in two recent checklists. Fifteen genera (25.4%) were rejected and 16 (27.1%) are considered equivocal. However, my lower estimate almost certainly underestimates endemism at genus rank because the circumscriptions of several genera not evaluated here, such as Pachycladon, could change in the future to become endemic. One new combination is made: Sonchus novae-zelandiae (Hook.f.) Garn.-Jones, although work in progress by others is likely to lead to several more.

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“…This leaves long-distance dispersal as the most plausible explanation for the occurrence on the Poor Knights and Forty Fours of Asplenium pauperequitum. It is already known that much of the Chatham Islands biota has a recent origin, resulting from periodic dispersals from mainland New Zealand (e.g., Campbell 1998;Millener 1999 (Cockayne 1902;Drury 1968;Nordenstam 1978;Wardle 1987Wardle , 1991Wagstaff & Breitwieser 2004;PdL unpubl. data).…”

Section: Discussionmentioning

confidence: 99%

A new location for the Poor Knights spleenwort (Asplenium pauperequitum,Aspleniaceae) on The Forty Fours, Chatham Islands, New Zealand

Cameron¹,

Lange²,

Perrie

et al. 2006

New Zealand Journal of Botany

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Documentation is made of the discovery of the Poor Knights spleenwort, (Asplenium pauperequitum) in a sample of vascular plant specimens collected from The Forty Fours. These islands are the easternmost outlier of the Chatham Islands archipelago. Hitherto this fern had been believed endemic to the Poor Knights Islands and Mokohinau Islands of the Hauraki Gulf, off eastern Northland, North Island, New Zealand. Frond and spore morphology together with chloroplast DNA sequences were used to confirm its identity. Whether this fern disjunction of some 1245 km is the result of vicariance or longdistance dispersal is discussed and long-distance dispersal of fern spores or whole sporangia is considered most likely.

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A clarification of the generic limits of Olearia and Pleurophyllum (astereae-compositae)

Cited by 25 publications

References 1 publication

Quaternary sediments and plant microfossils from Enderby Island, Auckland Islands

Quaternary sediments and plant microfossils from Enderby Island, Auckland Islands

Evidence-based review of the taxonomic status of New Zealand's endemic seed plant genera

A new location for the Poor Knights spleenwort (Asplenium pauperequitum,Aspleniaceae) on The Forty Fours, Chatham Islands, New Zealand

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