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  4. Pentapogon lautumia

Pentapogon lautumia

Fruiting panicle.<br>Photographer: Cathy Jones, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Dichelachne lautumia.<br>Photographer: Jan Clayton-Greene, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Dichelachne lautumia.<br>Photographer: Cathy Jones, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Dichelachne lautumia.<br>Photographer: Jan Clayton-Greene, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
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Synonyms

Deyeuxia “Flaxbourne”, Deyeuxia “Waima”, Dichelachne lautumia Edgar et Connor

Family

Poaceae

Authority

Pentapogon lautumia (Edgar & Connor) P.M. Peterson, Romasch. & Soreng

Flora category

Vascular – Native

Endemic taxon

Yes

Endemic genus

No

Endemic family

No

Structural class

Grasses

NVS code

The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.

DICLAU

Chromosome number

2n = 70

Current conservation status

  • Conservation status of New Zealand indigenous vascular plants, 2017

The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2017 using the New Zealand Threat Classification System (NZTCS). This report includes a statistical summary and brief notes on changes since 2012 and replaces all previous NZTCS lists for vascular plants. Authors: By Peter J. de Lange, Jeremy R. Rolfe, John W. Barkla, Shannel P. Courtney, Paul D. Champion, Leon R. Perrie, Sarah M. Beadel, Kerry A. Ford, Ilse Breitwieser, Ines Schönberger, Rowan Hindmarsh-Walls, Peter B. Heenan and Kate Ladley.

2018 | Threatened – Nationally Endangered

Previous conservation statuses

2012 | Threatened – Nationally Critical | Qualifiers: RR, St

2009 | Threatened – Nationally Critical | Qualifiers: St, RR

2004 | Range Restricted

Distribution

Endemic. South Island, Marlborough, mainly found near the mouth of the Flaxbourne River. Also recorded slightly further south from the lower Waima (Ure) River.

Habitat

One population is found mainly on limestone talus, both soil and rocky debris derived from quarrying activities, with a few plants in crevices and on ledges on natural rock faces. The second population is on limestone derived alluvial terraces. All plants are in full light with very little shelter

Features

Robust grey-green to orange-green tufts 450-650 mm tall. Branching extravaginal. Leaf-sheath chartaceous with membranous margins, more or less distinctly ribbed, glabrous, straw-coloured, or reddish purple, especially in culm leaves. Ligule 0.7-1.0 mm long, truncate, erose, sparsely ciliate, undersides scabrid. Leaf-blade 60-200 x 15-30 mm, greyish green maturing orange-green or reddish, undersides smooth, upper surface strongly ribbed, prickle-toothed on ribs; margins finely prickle-toothed. Culm 300-450 mm long, nodes green to purple with an upper fringe of dense, appressed hairs, internodes glabrous. Panicle 100-160 x 10-15 mm, linear-lanceolae, dense, contracted above, longer lower branches in slightly more distant clusters, scarcely spreading, spikelet bearing to base; rachis, branches and pedicels with short hair-like prickle-teeth. Spikelets 6-8 mm, green to straw-coloured or suffused with purple. Glumes 1-nerved, equal or upper very slightly longer, c.6mm, submembranous, elliptic-lanceolate, acuminate, keels finely prickle-toothed. Lemma less than or equal to glumes, 6-7 mm, subcoriaceous, papillose, minutely prickle-toothed above, apex bifid with hyaline finely acuminate lobes 0.5-1.0 mm long; awn 8-12 mm, mid-dorsal, or arising from slightly above midway, geniculate, twisted, very hairy below. Palea less than lemma, folded, keels prickle-toothed above, apex ciliate. Callus c.0.2 mm long, hairs up to 4 mm long. Rachilla 0.2-0.7 mm, glabrous or with a few hairs; prolongation 0.5 mm long. Lodicules 0.5 mm, cuneate, ciliate. Stamens 3; anthers 1.0-1.5 mm long. Ovary 1.0-1.3 mm; stigma-styles 0.7-1.5 mm long, hairs almost to base. Seed 3.5 x 1.0 mm, beaked.

Similar taxa

Distinguished from the allied Pentapogon crinitus by the callus hairs with are equal to or greater than 3 mm (in D. crinita they are less than 1 mm); by the shorter awn (8-12 cf. 20-30 mm in P. crinitus) and by the twisted rather than straight column.

Flowering

November - January

Fruiting

December - May

Life cycle

Florets are wind dispersed (Thorsen et al., 2009).

Propagation technique

Difficult to grow. Needs very well drained soil (it does best with the addition of limestone chips), in a sunny location. Dislikes humidity and damp ground. Fresh seed germinates easily.

Threats

Known from a only a few populations. Currently these seem to be secure and stable although the species remains very uncommon.

Attribution

Description modified from Edgar and Connor (2000)

References and further reading

Edgar, E.; Connor, H.E. 2000: Flora of New Zealand. Vol. V. Grasses. Christchurch, Manaaki Whenua Press. 650 pp.

Thorsen, M. J.; Dickinson, K. J. M.; Seddon, P. J. 2009. Seed dispersal systems in the New Zealand flora. Perspectives in Plant Ecology, Evolution and Systematics 11: 285-309

Citation

Please cite as: de Lange, P.J. (Year at time of access): Pentapogon lautumia Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/pentapogon-lautumia/ (Date website was queried)

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