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  4. Clematis marmoraria

Clematis marmoraria

In cultivation ex Hoary Head, NW Nelson.<br>Photographer: Jeremy R. Rolfe, Date taken: 15/03/2007, 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>
In cultivation ex Hoary Head, NW Nelson.<br>Photographer: Jeremy R. Rolfe, Date taken: 04/10/2007, 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>
In cultivation ex Hoary Head, NW Nelson.<br>Photographer: Jeremy R. Rolfe, Date taken: 04/10/2007, 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>
In cultivation ex Hoary Head, NW Nelson.<br>Photographer: Jeremy R. Rolfe, Date taken: 04/10/2007, 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>
Habitat, Hoary Head.<br>Photographer: Philip Smith, 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>
Showing rose-coloured tepals, Hoary Head.<br>Photographer: Philip Smith, 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>
Hoary Head.<br>Photographer: Philip Smith, 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

North-west Nelson marble clematis

Synonyms

None (described in 1975)

Family

Ranunculaceae

Authority

Clematis marmoraria Sneddon

Flora category

Vascular – Native

Endemic taxon

Yes

Endemic genus

No

Endemic family

No

Structural class

Lianes & Related Trailing Plants - Dicotyledons

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.

CLEMMR

Chromosome number

2n = 16

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 | Threatened – Nationally Vulnerable | Qualifiers: CD, RR

Previous conservation statuses

2009 | Threatened – Nationally Vulnerable | Qualifiers: CD, RR

2004 | Gradual Decline

Distribution

Endemic. New Zealand: South Island (Confined to two sites within north west Nelson, Kahurangi National Park).

Habitat

Alpine marble karrenfield where it grows in either in crevices in massive marble, or amongst semi-fixed rocks, stones and similar rocky sites in open herbfield

Features

A low rupestral dioecious subshrub with slender taproot and several stems, spreading in suitable habitats by a succession of suckers. Stems perennial, c.1-2 mm diameter, up to 500 mm long, almost or quite glabrous and inconspicuously grooved. Underground part of suckers 40-500 mm long with 2-14 pairs of much reduced leaves (internodes 1-60 mm long); usually rooting and branching at some nodes. Aerial stems erect to decumbent, very short (40-100 mm) but longer in shade, internodes 1-40 mm long; usually sparingly branched. Underground leaves 1-5 mm long, entire to minutely lobed. Green leaves ± crowded, subcoriaceous to coriaceous, almost glabrous, up 40 mm long, living c.2 years before slowly decaying to base. Petioles 5-18 mm long, channelled, not twining. Laminae broad-ovate to angular-ovate in outline when fresh, variously dissected (with major segments ± ascending and overlapping) from multifid-multipartite to deeply 3-lobed to 3-foliolate; lobes or leaflets deeply incised 2-3 times (to bipinnate below in leaflets), upper surface of segments concave and ± bordered, ultimately small, obtuse to subacute; lateral leaflets short petioluled, oblique at base. Subfloral leaves 3-21 mm long. Inflorescence a solitary flower, axillary, ± fulvous pubescent; peduncles 25-75 mm long; bracts 1-2 pairs –lower pair (often lacking) basal, connate, blade c.2 mm long, minutely 3-lobed - upper pair 2.0-7.7 mm long, narrow-oblong to spathulate, entire or shallowly lobed. Male flower 20-30 mm diameter; sepals 5-8, white (slightly green-stained when young), thinly fulvous-silky without, glabrous within, 6-18 × 3.0-10.5 mm, obovate (occasionally elliptic); stamens 20-50, 5-9 mm long, anthers 1.0-1.8 mm long, ovate-oblong, connective produced into minute blunt apiculus; carpels 0. Female flower with slightly smaller sepals; stamens 8-13, anthers barren; carpels 20-50. Achene seed body ovoid, 3-4 mm long, puberulent, brown; style 15-30 mm long, pale fulvous-plumose

Similar taxa

Distinguished from all other New Zealand Clematis (indigenous or naturalised) by the restriction to marble subalpine to alpine habitats, by tufted suckering shrublet growth habit; non twining petioles; and by the flowers which have pure white or faintly greenish-yellow, obovate-elliptic sepals.

Flowering

December

Flower colours

White

Fruiting

January - March

Life cycle

Pappate achenes are dispersed by wind (Thorsen et al., 2009).

Propagation technique

Can be grown from cuttings and fresh seed. Slow growing and best kept in a deep, well drained pot within an alpine house, except in cooler climates. Does best in lime rich soils.

Threats

Apparently confined to only two sites at which it remains vulnerable to animal (goat, deer) browse.

Etymology

clematis: From the Greek klema ‘vine’, alluding to the vine-like habit of many species

Where To Buy

Occasionally available from some specialist native plant nurseries. This species has been hybridised with several of the other New Zealand species ot produce a range of cultivars now popular with gardeners are widely available from garden centres.


Attribution

Description from Sneddon (1975)

References and further reading

Sneddon, B.V. 1975: A new Clematis from North-west Nelson, New Zealand. New Zealand Journal of Botany 13: 557-65.

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

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