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  4. Ranunculus grahamii

Ranunculus grahamii

Close up of flowers.<br>Photographer: David A. Norton, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
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Common name

Graham’s buttercup

Synonyms

None Known

Family

Ranunculaceae

Authority

Ranunculus grahamii Petrie

Flora category

Vascular – Native

Endemic taxon

Yes

Endemic genus

No

Endemic family

No

Structural class

Herbs - Dicotyledons other than Composites

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.

RANGRH

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: CD, RR

Previous conservation statuses

2009 | At Risk – Naturally Uncommon

2004 | Range Restricted

Distribution

Endemic. South Island, Mt Cook National Park within a very small area running from Malte Brun Range in the east to the main divide in the west as far south as Mt Nazomi.

Habitat

A high alpine (2300 - 2800 m a.s.l.) species of rock crevices, ledges, and cliff faces within the permanent snow line. It has a very short growing season during mid to late summer.

Features

Short, stout, erect, summer-green rosette-forming plant 70-120 mm tall. Rhizome stout, bearing numerous stringy rootlets. Leaves thick, fleshy, glaucous; radical leaves 3-4 or more; petioles 50-80 mm long with broad sheathing base, margins covered in white, sericeous hairs; blade 35-50 mm diam., glaucous, reniform, divided almost to base into 3 broadly cuneate segments, these again deeply lobed, succulent, coriaceous, glabrescent, margins with sparse long sericeous hairs. Flowering scape 1-3-flowered, 100-150 mm long, > leaves; bracts 1-2, similar to leaves but smaller and less divided. Flowers 20-30 mm diam.; sepals 5, broadly oblong, obtuse, external faces sericeous; petals golden yellow, 8-16, narrow-obovate, obtuse, nectaries near base, single or multiple; stamens numerous, in 2 or more series; receptacle broadly oblong or nearly orbicular. Achenes glabrous or sparsely hairy on body toward base. Body turgid, ovoid, 2.5-3.0(-3.5) mm long; surface dull, pale brown; beak 2.5-3.0 mm long, curved.

Similar taxa

Somewhat similar to R. haastii from which it differs by its restriction to high altitude rock crevices, ledges and cliff faces within the permanent snow line, rather than mobile scree, less divided leaves (leaves divided to 3/4 rather all the way to the base), and less obviously flattened, sometimes partially winged achene beak.

Flowering

February - March

Flower colours

Yellow

Fruiting

March - May

Propagation technique

Difficult. Should not be removed from the wild.

Threats

A very localised endemic of high alpine cliff and ledge habitats, within the permnent snow line. Because of its habitat and altitudinal range it is not often seen except by rock climbers, so exact numbers of plant sin the wild is unclear. It is believed to be at some risk from Thar and Chamois. Provided numbers of these browsing animals are kept low it is not believed to be seriously threatened.

Etymology

ranunculus: From the Latin ‘rana’ frog, meaning little frog and probably refers to the plants typical marshy habit where frogs abound

Where To Buy

Not commercially available

Attribution

Fact Sheet prepared by P.J. de Lange (12 February 2007). Description based on Fisher (1965).

References and further reading

Fisher, F.J.F. 1965: The alpine Ranunculi of New Zealand. Bulletin, New Zealand Department of Scientific and Industrial Research 165: 1-192.

NZPCN Fact Sheet citation

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

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