# Myosotis pottsiana > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Myosotis_pottsiana > Markdown URL: https://mediated.wiki/source/Myosotis_pottsiana.md > Source: https://en.wikipedia.org/wiki/Myosotis_pottsiana > Source revision: 1355387211 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) Species of flowering plant Myosotis pottsiana Habit and flowers of Myosotis pottsiana Conservation status Nationally Critical (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. pottsiana Binomial name Myosotis pottsiana (L.B.Moore) Meudt et al.[2] Synonyms Myosotis petiolata var. pottsiana L.B.Moore ***Myosotis pottsiana*** is a species of [flowering plant](/source/Flowering_plant) in the [family](/source/Family_(taxonomy)) [Boraginaceae](/source/Boraginaceae), [endemic](/source/Endemic_species) to the [North Island](/source/North_Island) of [New Zealand](/source/New_Zealand). [Lucy Moore](/source/Lucy_Moore_(botanist)) described *Myosotis petiolata* var. *pottsiana* in 1961. 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 exserted stamens. ## Taxonomy and etymology *Myosotis pottsiana* (L.B.Moore) Meudt, Prebble, R.J.Stanley & Thorsen is in the plant family [Boraginaceae](/source/Boraginaceae).[3] The species was originally described by [Lucy Moore](/source/Lucy_Moore_(botanist)) as a variety of *M. pansa, Myosotis petiolata* var. *pottsiana* in 1961.[2][4] It was raised to species rank by Heidi Meudt, Jessica Prebble, Rebecca Stanley, and Michael Thorsen in 2013.[4] The lectotype specimen of *Myosotis* *petiolata* var. *pottsiana* was collected by [Anthony Druce](/source/Anthony_Peter_Druce) in 1956, and the [holotype](/source/Holotype) is lodged at the Allan Herbarium of [Manaaki Whenua - Landcare Research](/source/Manaaki_Whenua_-_Landcare_Research) (CHR 87624).*[4]*[5] *Myosotis pottsiana* was discovered by Norman Potts and Marc Heginbotham around 1952,[6] and the variety and now species epithet honours Potts, who also collected and cultivated it.[4] *Myosotis pottsiana* is morphologically and genetically most similar to *[M. pansa](/source/Myosotis_pansa)* and *[M. petiolata](/source/Myosotis_petiolata).[4]* These three species are allopatric in their geographic distributions, and can be distinguished from one another by a suite of characters that includes corolla diameter (*M. pottsiana*: 5.3–9.8 mm; *M. petiolata*: 4.2–10.5 mm; and *M. pansa*: 7.6–14.3 mm).[4] ## Phylogeny Two individuals of *Myosotis pottsiana* have been included in [phylogenetic](/source/Phylogenetics) analyses of standard DNA sequencing markers ([nuclear ribosomal DNA](/source/Ribosomal_DNA) and [chloroplast DNA](/source/Chloroplast_DNA) regions).[7] In addition, several individuals of *Myosotis pottsiana* were included in two different studies that phylogenetically analysed [amplified fragment length polymorphisms](/source/Amplified_fragment_length_polymorphism) (AFLPs) of the informal *M. petiolata* species group.[4][7] In these analyses, *Myosotis pottsiana* was genetically differentiated from *[M. pansa](/source/Myosotis_pansa)* and *[M. petiolata](/source/Myosotis_petiolata)*.**[4][7]** ## Description ***Myosotis pottsiana*** plants are rosettes. The rosette leaves have [petioles](/source/Petiole_(botany)) that are 14–57 mm long. The rosette leaf blades are 7–51 mm long by 5–32 mm wide (length: width ratio 1.2–2.0: 1), usually narrowly obovate, obovate, broadly obovate, widest at or above the middle, with an [obtuse](/source/Glossary_of_leaf_morphology#obtuse) and [mucronate](/source/Mucronate) apex. Both surfaces of the leaf are uniformly and densely covered in straight, appressed, antrorse (forward-facing) hairs**.** Each rosette has multiple ascending**,** branched ebracteate (or sometimes partially bracteate) [inflorescences](/source/Inflorescence) that are up to 430 mm long. The cauline leaves are similar to the rosette leaves, but become smaller. The flowers are 6–73 per inflorescence, and each is borne on a short [pedicel](/source/Pedicel_(botany)) without a bract (or sometimes lowest flowers with a bract). The calyx is 2–4 mm long at flowering and 3–5 mm long at fruiting, lobed to half to three-quarters of its length, and densely covered in straight to curved, appressed to patent, antrorse hairs. The corolla is white and 7–15 mm in diameter, with a cylindrical tube, petals that are narrowly ovate, ovate, obovate or broadly obovate, and small yellow scales alternating with the petals. The anthers are fully exserted. The four smooth, shiny, usually medium to dark brown nutlets are 1.3–1.8 mm long by 0.9–1.2 mm wide and ovoid to broadly ovoid in shape.[4] The pollen of *Myosotis pottsiana* is unknown. The chromosome number of *M. pottsiana* is 2*n* = 44.[8] ## Distribution and habitat Although once thought to be extinct,[6] *Myosotis pottsiana* is known from a handful of populations in Bay of Plenty, North Island, New Zealand from 40 to 300 m ASL, on vertical rock walls, steep river banks and forest bluffs*.*[4][6] ## Conservation status *Myosotis pottsiana* is listed as Threatened - Nationally Critical in the most recent assessment (2017-2018) of the [New Zealand Threatened Classification](/source/New_Zealand_Threat_Classification_System) for plants.[3] The qualifiers "EF" (Extreme fluctuations) and "Sp" (Sparse) are also attached to the assessment.[3] ## Gallery - Flowers - Flowers, side view - Inflorescence - Leaves - Upper leaf surface, showing straight, appressed hairs - Lower leaf surface - Habit and habitat ## References 1. **[^](#cite_ref-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**: 1–86. [OCLC](/source/OCLC_(identifier)) [1041649797](https://search.worldcat.org/oclc/1041649797). 1. ^ [***a***](#cite_ref-:2_2-0) [***b***](#cite_ref-:2_2-1) 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. ^ [***a***](#cite_ref-:0_3-0) [***b***](#cite_ref-:0_3-1) [***c***](#cite_ref-:0_3-2) ["Myosotis pottsiana"](https://www.nzpcn.org.nz/flora/species/myosotis-pottsiana/). *New Zealand Plant Conservation Network*. Retrieved 13 May 2023. 1. ^ [***a***](#cite_ref-:4_4-0) [***b***](#cite_ref-:4_4-1) [***c***](#cite_ref-:4_4-2) [***d***](#cite_ref-:4_4-3) [***e***](#cite_ref-:4_4-4) [***f***](#cite_ref-:4_4-5) [***g***](#cite_ref-:4_4-6) [***h***](#cite_ref-:4_4-7) [***i***](#cite_ref-:4_4-8) [***j***](#cite_ref-:4_4-9) Meudt, Heidi; Prebble, Jessica; Stanley, Rebecca J.; Thorsen, Mike (1 January 2013). ["Morphological and amplified fragment length polymorphism (AFLP) data show that New Zealand endemic Myosotis petiolata (Boraginaceae) comprises three rare and threatened species"](https://www.wikidata.org/wiki/Q54687696). *Australian Systematic Botany*. **26** (3): 210. [doi](/source/Doi_(identifier)):[10.1071/SB13023](https://doi.org/10.1071%2FSB13023). 1. **[^](#cite_ref-5)** ["Holotype of Myosotis petiolata var. pottsiana"](https://scd.landcareresearch.co.nz/Specimen/CHR%2087624). *Systematics Collections Data, Manaaki Whenua - Landcare Research*. Retrieved 13 May 2023. 1. ^ [***a***](#cite_ref-:3_6-0) [***b***](#cite_ref-:3_6-1) [***c***](#cite_ref-:3_6-2) Bowen, Dawn (1985). ["A Rare Experience: rediscovering Myosotis petiolata var, pottsiana"](https://bts.nzpcn.org.nz/site/assets/files/22131/well_1985_42__61-63.pdf) (PDF). *Wellington Botanical Society Bulletin*. **42**: 61–63. 1. ^ [***a***](#cite_ref-:1_7-0) [***b***](#cite_ref-:1_7-1) [***c***](#cite_ref-:1_7-2) Meudt, Heidi M.; Prebble, Jessica M.; Lehnebach, Carlos A. (1 May 2015). ["Native New Zealand forget-me-nots (Myosotis, Boraginaceae) comprise a Pleistocene species radiation with very low genetic divergence"](https://doi.org/10.1007/s00606-014-1166-x). *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). [ISSN](/source/ISSN_(identifier)) [2199-6881](https://search.worldcat.org/issn/2199-6881). 1. **[^](#cite_ref-8)** [de Lange, P.J.](/source/Peter_de_Lange_(botanist)); Murray, B.G. (2002). "Contributions to a chromosome atlas of the New Zealand flora—37. Miscellaneous families". *New Zealand Journal of Botany*. **40** (1): 1–23. [doi](/source/Doi_(identifier)):[10.1080/0028825X.2002.9512767](https://doi.org/10.1080%2F0028825X.2002.9512767). [ISSN](/source/ISSN_(identifier)) [0028-825X](https://search.worldcat.org/issn/0028-825X). [Wikidata](/source/WDQ_(identifier)) [Q114954860](https://www.wikidata.org/wiki/Q114954860). ## External links Wikimedia Commons has media related to [Myosotis pottsiana](https://commons.wikimedia.org/wiki/Category:Myosotis_pottsiana). - [*Myosotis pottsiana* occurrence data from Australasian Virtual Herbarium](https://avh.ala.org.au/occurrences/search?taxa=myosotis+pottsiana#tab_mapView) Taxon identifiers Myosotis pottsiana Wikidata: Q17416945 Wikispecies: Myosotis pottsiana CoL: 45638 GBIF: 8187228 iNaturalist: 515777 IPNI: 77133335-1 NCBI: 1302917 NZOR: 016c5196-39af-438e-b70f-487c658029b7 NZPCN: 764 Open Tree of Life: 5518960 POWO: urn:lsid:ipni.org:names:77133335-1 WFO: wfo-0001337343 Myosotis petiolata var. pottsiana Wikidata: Q96181351 GBIF: 7824799 IPNI: 77133334-1 NZOR: cef5b7f1-7682-4bc9-b9d6-b47873bd40b2 POWO: urn:lsid:ipni.org:names:77133334-1 WFO: wfo-0001384858 --- Adapted from the Wikipedia article [Myosotis pottsiana](https://en.wikipedia.org/wiki/Myosotis_pottsiana) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Myosotis_pottsiana?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.