# Myosotis explanata

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Species of flowering plant

Myosotis explanata Flowering plants of Myosotis explanata Conservation status Naturally Uncommon (NZ TCS)[1] Scientific classification Kingdom: Plantae Clade: Embryophytes Clade: Tracheophytes Clade: Spermatophytes Clade: Angiosperms Clade: Eudicots Clade: Asterids Order: Boraginales Family: Boraginaceae Genus: Myosotis Species: M. explanata Binomial name Myosotis explanata Cheeseman[citation needed]

***Myosotis explanata*** is a species of [flowering plant](/source/Flowering_plant) in the [family](/source/Family_(taxonomy)) [Boraginaceae](/source/Boraginaceae), [endemic](/source/Endemism) to high-elevation habitats in the [South Island](/source/South_Island) of [New Zealand](/source/New_Zealand). [Thomas Cheeseman](/source/Thomas_Cheeseman) described the species in 1906. Plants of this species of [forget-me-not](/source/Forget-me-nots) are [perennial](/source/Perennial_plant) rosettes with ebracteate inflorescences and white corollas with stamens that are partly exserted, with the tips of the anthers only surpassing the scales.

## Taxonomy and etymology

*Myosotis explanata* Cheeseman is in the plant family [Boraginaceae](/source/Boraginaceae).[2] The species was originally described in 1906 by [Thomas Cheeseman](/source/Thomas_Cheeseman) in his *[Manual of the New Zealand Flora](https://en.wikipedia.org/w/index.php?title=Manual_of_the_New_Zealand_Flora&action=edit&redlink=1)*.[3][4] The most recent treatment of this species was done by [Lucy B. Moore](/source/Lucy_Moore_(botanist)) in the *Flora of New Zealand.[3]*

The original specimens ([syntypes](/source/Syntype)) of *Myosotis explanata* were collected by Cheeseman and [Leonard Cockayne](/source/Leonard_Cockayne) in [Arthurs Pass](/source/Arthur's_Pass_National_Park) and Walkers Pass in the South Island, New Zealand, and are likely lodged the [Auckland War Memorial Museum](/source/Auckland_War_Memorial_Museum) herbarium AK (e.g. AK 7460).[3][5]

*Myosotis explanata* is similar morphologically to another South Island species, *[M. suavis](/source/Myosotis_suavis).*[3] Lucy Moore distinguished the two species in her key using the following characters:

"Hairs crowded, soft; corolla c. 7 mm. diam.......*.Myosotis suavis*

Hairs sparse, rather stiff; corolla c. 10 mm. diam.....*M. explanat*a" [3]

## Phylogeny

*Myosotis explanata* was shown to be a part of the [monophyletic](/source/Monophyletic) southern hemisphere lineage of *Myosotis* in [phylogenetic](/source/Phylogenetics) analyses of standard DNA sequencing markers ([nuclear ribosomal DNA](/source/Ribosomal_DNA) and [chloroplast DNA](/source/Chloroplast_DNA) regions) of New Zealand *Myosotis*.[6] Within the southern hemisphere lineage, species relationships were not well resolved, and the placement of the sole individual sampled of *M. explanata* was also not well resolved.[7][6]

## Description

***Myosotis explanata*** plants are rosettes. The rosette leaves have broad [petioles](/source/Petiole_(botany)) that are about as long as the leaf blades. The rosette leaves are 30–70 mm long by c. 15 mm wide (length: width ratio c. 2–4: 1), and the leaf blade is obovate to linear-spathulate, widest at or above the middle, with an [obtuse](/source/Obtuse_(leaf)), rounded apex. Both surfaces of the leaf are uniformly and sparsely to densely covered in patent to erect hairs. The upper surface of the leaf has densely distributed antrorse (forward-facing) hairs whereas on the lower surface the hairs are not as densely distributed and retrorse (backward-facing)**.** Each rosette has several ascending to erect, ebracteate [inflorescences](/source/Inflorescence) that are up to 200 mm long and mostly unbranched. The cauline leaves are similar to the rosette leaves, but are smaller sessile, become smaller toward the top of the inflorescence, narrow-elliptic, and [acuminate](/source/Acuminate), and have hairs similar to the rosette leaves. The flowers are many per inflorescence, and each is borne on a short [pedicel](/source/Pedicel_(botany)), without a bract. The calyx is c. 10 mm long at flowering and fruiting, lobed to one-half of its length, and with some patent to erect hairs, some of which are hooked, as well as retrorse hairs near the base. The corolla is white and can reach 10 mm in diameter, with a cylindrical tube, and small scales alternating with the petals. The anthers are partly exserted, with the anther tips only surpassing the faucal scales. The nutlets are c. 2.5 mm long.[3]

The [pollen](/source/Pollen) of *Myosotis explanata* is unknown.

The [chromosome number](/source/Chromosome_number) of *M. explanata* is unknown.

Flowering November–January and fruiting January–April.[2]

## Distribution and habitat

*Myosotis* *explanata* is a [forget-me-not](/source/Forget-me-not) that occurs in high-elevation habitats in along the main divide in Canterbury and Westland, South Island.[3][8][2]

## Conservation status

*Myosotis explanata* is listed as At Risk - Naturally Uncommon with the qualifiers "DP" (Data Poor), "EF" (Extreme Fluctuations), and "RR" (Range Restricted) on the most recent assessment (2017-2018) under the [New Zealand Threatened Classification](/source/New_Zealand_Threat_Classification_System) system for plants.[1]

## Gallery

		- Rosettes

		- Rosette

		- Fruiting plant

## References

1. ^ [***a***](#cite_ref-NZTCS_1-0) [***b***](#cite_ref-NZTCS_1-1) Lange, Peter J. de; Rolfe, Jeremy R.; Barkla, John W.; Courtney, Shannel P.; Champion, Paul D.; Perrie, Leon R.; Beadel, Sarah M.; Ford, Kerry A.; Breitwieser, Ilse; Schönberger, Ines; Hindmarsh-Walls, Rowan (May 2018). ["Conservation status of New Zealand indigenous vascular plants, 2017"](https://www.doc.govt.nz/globalassets/documents/science-and-technical/nztcs22entire.pdf) (PDF). *New Zealand Threat Classification Series*. **22**: 45. [OCLC](/source/OCLC_(identifier)) [1041649797](https://search.worldcat.org/oclc/1041649797).

1. ^ [***a***](#cite_ref-:3_2-0) [***b***](#cite_ref-:3_2-1) [***c***](#cite_ref-:3_2-2) ["Myosotis explanata"](https://www.nzpcn.org.nz/flora/species/myosotis-explanata/). *New Zealand Plant Conservation Network*. Retrieved 29 July 2023.

1. ^ [***a***](#cite_ref-:2_3-0) [***b***](#cite_ref-:2_3-1) [***c***](#cite_ref-:2_3-2) [***d***](#cite_ref-:2_3-3) [***e***](#cite_ref-:2_3-4) [***f***](#cite_ref-:2_3-5) [***g***](#cite_ref-:2_3-6) Moore, L.B. ["Boraginaceae. In 'Flora of New Zealand'. (Ed. HH Allan) Vol. 1, pp. 806–833"](https://floraseries.landcareresearch.co.nz/pages/Taxon.aspx?id=_2dd90ab4-331f-4d49-bb31-b0a843e65931&fileName=Flora%201.xml). *(Government Printer: Wellington, New Zealand) floraseries.landcareresearch.co.nz*. Retrieved 27 April 2022.

1. **[^](#cite_ref-4)** Cheeseman, Thomas (1 January 1906). [*Manual of the New Zealand flora*](https://www.wikidata.org/wiki/Q51396409).

1. **[^](#cite_ref-5)** ["Syntype of Myosotis explanata - AK 7460"](https://www.aucklandmuseum.com/collections-research/collections/record/am_naturalsciences-object-346283). *aucklandmuseum.com*. Retrieved 30 July 2023.

1. ^ [***a***](#cite_ref-:1_6-0) [***b***](#cite_ref-:1_6-1) Meudt, Heidi; Prebble, Jessica; Lehnebach, Carlos A. (7 November 2014). ["Native New Zealand forget-me-nots (Myosotis, Boraginaceae) comprise a Pleistocene species radiation with very low genetic divergence"](https://www.wikidata.org/wiki/Q54789770). *Plant Systematics and Evolution*. **301** (5): 1455–1471. [doi](/source/Doi_(identifier)):[10.1007/S00606-014-1166-X](https://doi.org/10.1007%2FS00606-014-1166-X). [S2CID](/source/S2CID_(identifier)) [254048318](https://api.semanticscholar.org/CorpusID:254048318).

1. **[^](#cite_ref-:0_7-0)** Richard Winkworth; Jürke Grau; Alastair W. Robertson; Peter Lockhart (1 August 2002). "The origins and evolution of the genus Myosotis L. (Boraginaceae)". *[Molecular Phylogenetics and Evolution](/source/Molecular_Phylogenetics_and_Evolution)*. **24** (2): 180–193. [doi](/source/Doi_(identifier)):[10.1016/S1055-7903(02)00210-5](https://doi.org/10.1016%2FS1055-7903%2802%2900210-5). [ISSN](/source/ISSN_(identifier)) [1055-7903](https://search.worldcat.org/issn/1055-7903). [PMID](/source/PMID_(identifier)) [12144755](https://pubmed.ncbi.nlm.nih.gov/12144755). [Wikidata](/source/WDQ_(identifier)) [Q30707919](https://www.wikidata.org/wiki/Q30707919).

1. **[^](#cite_ref-8)** ["Myosotis explanata Cheeseman"](https://www.gbif.org/species/5661314). *www.gbif.org*. Retrieved 29 July 2023.

## External links

Wikimedia Commons has media related to [Myosotis explanata](https://commons.wikimedia.org/wiki/Category:Myosotis_explanata).

- [*Myosotis explanata* occurrence data from Australasian Virtual Herbarium](https://avh.ala.org.au/occurrences/search?taxa=myosotis+explanata#tab_mapView)

Taxon identifiers Myosotis explanata Wikidata: Q17416560 Wikispecies: Myosotis explanata CoL: 455VZ GBIF: 5661314 iNaturalist: 404006 IPNI: 119012-1 NCBI: 1302909 NZOR: 86be000f-8826-4a02-afcd-810e73793c25 NZPCN: 594 Open Tree of Life: 5512850 POWO: urn:lsid:ipni.org:names:119012-1 WFO: wfo-0000368117

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Adapted from the Wikipedia article [Myosotis explanata](https://en.wikipedia.org/wiki/Myosotis_explanata) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Myosotis_explanata?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.