Ranunculus grahamii
Common name
Graham’s buttercup
Synonyms
None Known
Family
Ranunculaceae
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
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)