{{Short description|Species of flowering plant}} {{Use New Zealand English|date=July 2023}} {{Use dmy dates|date=July 2023}} {{Speciesbox | image = SP105619 Myosotis angustata Cheeseman WELT Te Papa 1592439 400251.jpg | image_caption = | status = NC | status_system = NZTCS | status_ref = <ref name="NZTCS"/> | genus = Myosotis | species = angustata | authority = [[Thomas Cheeseman|Cheeseman]]<ref name=":3" />| }}

'''''Myosotis angustata''''' is a species of [[flowering plant]] in the [[Family (taxonomy)|family]] [[Boraginaceae]], [[Endemism|endemic]] to the [[South Island]] of [[New Zealand]]. [[Thomas Cheeseman]] described the species in 1906. Plants of this species of [[Forget-me-nots|forget-me-not]] are [[Perennial plant|perennial]] rosettes with ebracteate inflorescences and white corollas with stamens that are wholly exserted.

== Description == ''M. angustata'' plants are rosettes. The rosette leaves have broad [[Petiole (botany)|petioles]] that difficult to distinguish from the leaf blades. The rosette leaves are about 20&nbsp;mm long by 4&nbsp;mm wide (length: width ratio 5: 1), usually linear-spathulate and widest at or above the middle, with an [[Acute (botany)|subacute]] apex. Both surfaces of the leaf are uniformly and densely covered in appressed hairs, with lower density on the lower surface'''.''' Each rosette has several ascending to erect, ebracteate [[inflorescence]]s that are up to 150&nbsp;mm long. The cauline leaves are similar to the rosette leaves, but become smaller, are linear or narrow-oblong and subacute, and have hairs similar to the rosette leaves. The flowers are many per inflorescence, and each is borne on a short [[Pedicel (botany)|pedicel]], each with a bract.

The calyx is 5–8&nbsp;mm long at flowering and fruiting, lobed to one-half of its length, and densely covered in straight hairs, as well as some hooked hairs, all of which are antrorse. The corolla is white and about 7&nbsp;mm in diameter, with a cylindrical tube, and small scales alternating with the petals. The anthers are exserted with the anthers surpassing the faucal scales. The nutlets are 2.2&nbsp;mm long by 1&nbsp;mm wide.<ref name=":5" /> Flowering and fruiting occur in January.<ref name=":5" /><ref name=":3" /><gallery mode="packed" heights="170"> File:SP105619 Myosotis angustata Cheeseman WELT Te Papa 1592439 400260.jpg|Floral detail File:SP105619 Myosotis angustata Cheeseman WELT Te Papa 1592439 400245.jpg|Partially in bud File:SP105610 Myosotis angustata Cheeseman WELT Te Papa 1592357 400152.jpg|Growth habit </gallery>

== Taxonomy and etymology == ''M. angustata'' Cheeseman is in the plant family [[Boraginaceae]].<ref name=":0">{{Cite web |title=Myosotis angustata |url=https://www.nzpcn.org.nz/flora/species/myosotis-angustata/ |access-date=2023-07-25 |website=New Zealand Plant Conservation Network |language=en}}</ref> It was originally described by New Zealand botanist [[Thomas Cheeseman]] in his ''Manual of the New Zealand Flora'' in 1906.<ref name=":3">{{Cite book |last=Cheeseman |first=Thomas |url=https://www.wikidata.org/wiki/Q51396409 |title=Manual of the New Zealand flora |date=1906-01-01 |language=English}}</ref> The most recent treatment of this species was done by [[Lucy Moore (botanist)|Lucy B. Moore]] in the ''Flora of New Zealand.''<ref name=":5">{{Cite web |last=Moore |first=L.B. |title=Boraginaceae. In 'Flora of New Zealand'. (Ed. HH Allan) Vol. 1, pp. 806–833 |url=https://floraseries.landcareresearch.co.nz/pages/Taxon.aspx?id=_2dd90ab4-331f-4d49-bb31-b0a843e65931&fileName=Flora%201.xml |access-date=2022-04-27 |website=(Government Printer: Wellington, New Zealand) floraseries.landcareresearch.co.nz}}</ref>

The original specimens ([[syntype]]s) of this species were collected by Cheeseman in "[[Mount Arthur (New Zealand)|Mt Arthur]] Plateau and Raglan Mountains", South Island, New Zealand.<ref name=":3" /> The specimens collected by Cheeseman are housed at the herbarium of the [[Auckland War Memorial Museum]] (AK).<ref>{{Cite web |title=Myosotis angustata - AK7471 |url=https://www.aucklandmuseum.com/collections-research/collections/record/am_naturalsciences-object-432656 |access-date=26 July 2023 |website=Auckland Museum - Collections Online}}</ref><ref>{{Cite web |title=Myosotis angustata - AK210593 |url=https://www.aucklandmuseum.com/collections-research/collections/record/am_naturalsciences-object-324623 |access-date=26 Jul 2023 |website=Auckland Museum - Collections Online}}</ref><ref>{{Cite web |title=Myosotis angustata - AK7472 |url=https://www.aucklandmuseum.com/collections-research/collections/record/am_naturalsciences-object-330787 |access-date=26 Jul 2023 |website=Auckland Museum - Collections Online}}</ref>

Cheeseman noted that ''M. angustata'' is morphologically very similar to ''M. traversii,'' distinguishing them by ''M. angustata''<nowiki/>'s narrower leaves and relatively longer anthers, among other differences.''<ref name=":3" />''

=== Phylogeny === Two individuals of ''M. angustata'' have been included in [[Phylogenetics|phylogenetic]] analyses of standard DNA sequencing markers ([[Ribosomal DNA|nuclear ribosomal DNA]] and [[chloroplast DNA]] regions) of New Zealand ''Myosotis.<ref name=":1" />'' Within the southern hemisphere lineage, species relationships, including those of the two individual sequenced of ''M. angustata,'' were not well resolved.<ref name=":1">{{Cite journal |last1=Meudt |first1=Heidi M. |last2=Prebble |first2=Jessica M. |last3=Lehnebach |first3=Carlos A. |date=2015-05-01 |title=Native New Zealand forget-me-nots (Myosotis, Boraginaceae) comprise a Pleistocene species radiation with very low genetic divergence |url=https://doi.org/10.1007/s00606-014-1166-x |journal=Plant Systematics and Evolution |language=en |volume=301 |issue=5 |pages=1455–1471 |doi=10.1007/s00606-014-1166-x |bibcode=2015PSyEv.301.1455M |s2cid=254048318 |issn=2199-6881|url-access=subscription }}</ref>

== Distribution and habitat == ''M.'' ''angustata'' is a [[forget-me-not]] originally collected from Mt Arthur and Raglan Range, in the northern part of the South Island, New Zealand.<ref name=":5" /> It is currently considered to be extant only in [[Kahurangi National Park]].<ref name=":0" />

== Conservation status == ''M. angustata'' is listed as Threatened – Nationally Critical with the qualifiers Data Poor (DP) and Range Restricted (RR) on the most recent assessment (2017-2018) under the [[New Zealand Threat Classification System|New Zealand Threatened Classification]] system for plants.<ref name="NZTCS">{{Cite journal |last1=Lange |first1=Peter J. de |last2=Rolfe |first2=Jeremy R. |last3=Barkla |first3=John W. |last4=Courtney |first4=Shannel P. |last5=Champion |first5=Paul D. |last6=Perrie |first6=Leon R. |last7=Beadel |first7=Sarah M. |last8=Ford |first8=Kerry A. |last9=Breitwieser |first9=Ilse |last10=Schönberger |first10=Ines |last11=Hindmarsh-Walls |first11=Rowan |date=May 2018 |title=Conservation status of New Zealand indigenous vascular plants, 2017 |url=https://www.doc.govt.nz/globalassets/documents/science-and-technical/nztcs22entire.pdf |journal=New Zealand Threat Classification Series |volume=22 |pages=45 |oclc=1041649797}}</ref>

== References == {{Reflist}}

== External links == {{Commons}} * [https://avh.ala.org.au/occurrences/search?taxa=myosotis+angustata#tab_mapView ''Myosotis angustata'' occurrence data from Australasian Virtual Herbarium]

{{Taxonbar|from=Q17416596}}

[[Category:Endemic flora of New Zealand]] [[Category:Endangered flora of New Zealand]] [[Category:Taxa named by Thomas Frederic Cheeseman]] [[Category:Plants described in 1906]] [[Category:Myosotis|angustata]] [[Category:Flora of the South Island]]