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  4. Myosotis arnoldii

Myosotis arnoldii

Arthur Range, Kahurangi National Park.<br>Photographer: Andrew MacDonald, Date taken: 3 December 2017, 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>
Yellow flowered form, Arthur Range, Kahurangi National Park.<br>Photographer: Andrew MacDonald, Date taken: 3 December 2017, 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>
Bronze flowered form, Arthur Range, Kahurangi National Park.<br>Photographer: Andrew MacDonald, Date taken: 3 December 2017, 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, Arthur Range, Kahurangi National Park.<br>Photographer: Simon Walls, Date taken: 26 February 2016, 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>
Plant in habitat, Arthur Range, Kahurangi National Park.<br>Photographer: Andrew MacDonald, Date taken: 3 December 2017, 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>
A plant at Hoary Head, Nelson (January).<br>Photographer: John Smith-Dodsworth, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
Myosotis arnoldii.<br>Photographer: Alastair Robertson, Licence: All rights reserved.
Myosotis arnoldii.<br>Photographer: Alastair Robertson, Licence: All rights reserved.
Myosotis arnoldii.<br>Photographer: Alastair Robertson, Licence: All rights reserved.
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Synonyms

None (first described in 1961)

Family

Boraginaceae

Authority

Myosotis arnoldii L.B.Moore

Flora category

Vascular – Native

Endemic taxon

Yes

Endemic genus

No

Endemic family

No

Structural class

Herbs - Dicotyledons other than Composites

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: RR

Previous conservation statuses

2009 | At Risk – Naturally Uncommon

2004 | Range Restricted

Distribution

Endemic. South Island: Marlborough (Upper Ure (Waima) River, Chalk Range especially around Ben More; Nelson (Hoary Head)

Habitat

Myosotis arnoldii is a basicole known only from marble (North West Nelson) and limestone (Marlborough) rocks where it grows on sparsely vegetated cliff faces, ledges and associated rubble slopes.

Features

Stout, tufted, silvery grey perennial herb. Rosette-leaves 30-70 × 5-9 mm, linear-spathulate to oblanceolate, lamina merging into broad ill-defined petiole, tip subacute to obtuse; hairs alike on both surfaces, uniformly stiff, straight, closely appressed, strongly overlapping so at to completely cover leaf surface. Lateral branches erect, up to 180 mm long, leafless below cyme, lower internodes < leaves. Stem-leaves 15-25 × 2-5 mm, narrow-oblong, tip subacute; hairs like those of rosette-leaves. Cymes usually once forked, ebracteate, many-flowered, compact and 2-3 cm. long in flower, internodes and pedicels short. Calyx c.8 mm long, lobes c. 1/2 length, subacute; covered in short appressed hairs, these forming a close even silvery cover from which project long stiff hooked hairs that are most numerous towards the base. Corolla yellow, greenish to almost black, 8-10 mm diameter, tube 10-15 mm long, narrow-funnelform, > lobes, lobes c.3 × 3 mm, ± oblong; filaments broad, fixed between scales, about equal to anthers; anthers 2 mm long, wholly above scales; style at least 2× calyx, stigma capitate. Nutlet 2.6-3.1 × 1.3-1.5 mm, ovate-elliptic to elliptic, black.

Similar taxa

Myosotis arnoldii is like a stouter version of M. angustata from which it differs by its silvery leaves and stems, strongly overlapping leaf hairs which completely obscure the leaf epidermis, and by the typically dark greenish to almost black (rarely yellow) rather than white flowers. The flowers of Myosotis arnoldii are rather similar to those of M. macrantha which can show the same range of colours, they differ only in that the lobes of M. macrantha seem to spread more widely.

Flowering

October - January

Flower colours

Green, Yellow

Fruiting

December - May

Propagation technique

Somewhat difficult. Can be grown in a rock garden or alpine house but results vary. Like all indigenous Myosotis this species is sensitive to humidity and prone to fungal attacks from mildews and rusts in muggy weather.

Threats

Within its only known habitat this species is locally common and so far does not appear to be seriously threatened by weeds or browsing animals.

Etymology

myosotis: Mouse-eared

Where To Buy

Not commercially available

Attribution

Fact Sheet prepared for NZPCN by P.J. de Lange 1 February 2008. Description based on Allan (1961).

References and further reading

Allan, H.H. 1961: Flora of New Zealand. Vol. I. Goverment Printer, Wellington.

Citation

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

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