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  4. Agrostis oresbia

Agrostis oresbia

Specimen from Hikurangi.<br>Photographer: Mike Thorsen, Licence: All rights reserved.
Hikurangi.<br>Photographer: Mike Thorsen, Licence: All rights reserved. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Hikurangi.<br>Photographer: Mike Thorsen, Licence: All rights reserved. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Hikurangi.<br>Photographer: Mike Thorsen, Licence: All rights reserved. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
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Common name

mountain bent

Synonyms

None

Family

Poaceae

Authority

Agrostis oresbia Edgar

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.

AGRORE

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.

2012 | At Risk – Naturally Uncommon | Qualifiers: DP, Sp

Previous conservation statuses

2009 | At Risk – Naturally Uncommon

2004 | Sparse

Distribution

Endemic. North Island (Raukumara, Ruahine and Tararua Ranges). South Island, North-West Nelson (Lake Aorere and Mt Domett only)

Habitat

A subalpine to alpine species frequenting damp seepages and water courses within tussock grassland and on rocky ground, shaded cliff faces or screes, occasionally on river flats.

Features

Tufted or stoloniferous plants 50-250 mm, culms overtopping leaves. Leaf-sheath hyaline, light green to light brown, prominently ribbed, smooth, rarely with prickle teeth. Ligule 1-4.5 mm, truncate to obtuse, denticulate or entire, glabrous. Leaf-blade 20-70 x 1.5-2 mm, flat or folded, undersides smooth, upper prominently ribbed, margins usually smooth, sometimes sparsely to densely, scabrid, apex tapered, blunt, scabrid. Culm erect, internodes glabrous. Panicle (15-)20-60 mm, open, lax, oblong to pyramidal, with spreading or flexuous branches; rachis smooth, branches and pedicels smooth or scabrid. Spikelets 2-2.5(-3) mm, purplish. Glumes unequal, acute to acuminate, keel scabrid near apex, margins smooth, sometimes scabrid near apex; lower, 2-2.5(-3) mm, ovate-lanceolate, upper 1.7-2.5(-3) mm, elliptic-lanceolate. Lemma 1.5-2 mm, glabrous, faintly 5-nerved, ovate, obtuse; awn (1.5-)2-3 mm, geniculate, slightly projecting beyond glumes. Callus with minute hairs. Anthers 0.4-0.9 mm.

Similar taxa

A. oresbia could be confused with A. magellanica Lam. but it is a smaller plant in all respects. It is perhaps closest to A. muelleriana Vickery from which it differs by its larger, more open, and laxer panicle, and by the glumes which are less scabrid and papillose. A. oresbia has a somewhat similar appearance to A. personata Edgar, from which it can be distinguished by its intravaginal innovations; awned lemmas; and by the abaxially smooth ligules. Palea 0.5 mm, ovate.

Flowering

unknown

Fruiting

unknown

Life cycle

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

Propagation technique

Unknown but should be easy from fresh seed and rooted pieces

Threats

Not threatened but rather a naturally uncommon species of spradic occurrence which is why it has been listed

Etymology

agrostis: Greek name for a kind of grass

Attribution

Fact sheet prepared for NZPCN by P.J. de Lange June 2005. 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 2009 Vol. 11 No. 4 pp. 285-309

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