Myosotis petiolata

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Myosotis petiolata
SP023506 Myosotis petiolata Hook.f. WELT Te Papa 473062 30070.jpg
Type specimen of M. petiolata
Status NZTCS NC.svg
Nationally Critical (NZ TCS) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Boraginales
Family: Boraginaceae
Genus: Myosotis
Species:
M. petiolata
Binomial name
Myosotis petiolata

Myosotis petiolata is a species of flowering plant in the family Boraginaceae, endemic to the Hawkes Bay region of the North Island of New Zealand. Joseph Dalton Hooker described the species in 1853. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white corollas with exserted stamens.

Contents

Taxonomy and etymology

Myosotis petiolata is in the plant family Boraginaceae. [3] The species was described by Joseph Dalton Hooker in 1853 in Flora Novae-Zelandiae . [4] [5]

The lectotype specimen of Myosotis petiolata was collected by William Colenso, and the isolectotype is lodged at the herbarium of the Museum of New Zealand, Te Papa Tongarewa (WELT SP023506). [5] [6]

The leaves of M. petiolata are petiolate, [5] i.e. they have a petiole, which may refer to the species epithet, petiolata.

Myosotis petiolata is morphologically and genetically most similar to M. pansa and M. pottsiana. [5] 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. petiolata: 4.2–10.5 mm; M. pansa: 7.6–14.3 mm; and M. pottsiana: 5.3–9.8 mm). [5]

Phylogeny

To date, no individuals of Myosotis petiolata have been included in phylogenetic analyses of standard DNA sequencing markers (nuclear ribosomal DNA and chloroplast DNA regions). [7] [8]

However, two to three individuals of Myosotis petiolata were included in two different studies that phylogenetically analysed amplified fragment length polymorphisms (AFLPs) of the informal M. petiolata species group. [5] [7] In these analyses, Myosotis petiolata was genetically differentiated from M. pansa and M. pottsiana . [5] [7] In addition, about 70% of the genetic variation was partitioned within the populations rather than among them (30%). [5] [9]

Three individuals from one population of M. petiolata were also genotyped in a study that developed microsatellite DNA markers for another species group of New Zealand Myosotis. [10] [9] The individuals of M. petiolata included had low genetic diversity. [9]

Description

Myosotis petiolata plants are rosettes. The rosette leaves have petioles that are 8–68 mm long. The rosette leaf blades are 3–35 mm long by 2–24 mm wide (length: width ratio 1.1–2.0: 1), usually narrowly obovate, obovate, broadly obovate, widest at or above the middle, with an obtuse and mucronate apex. Both surfaces of the leaf are uniformly and densely covered in straight, appressed, antrorse (forward-facing) hairs. Each rosette has multiple ascending, unbranched or sometimes once-branched ebracteate inflorescences that are up to 470 mm long. The cauline leaves are similar to the rosette leaves, but become smaller. The flowers are 8–35 per inflorescence and each is borne on a short pedicel without a bract. The calyx is 2–4 mm long at flowering and 3–5 mm long at fruiting, lobed to about three-quarters of its length, and densely covered in straight to curved, appressed to patent, antrorse hairs. The corolla is white and 5–10 mm in diameter, with a cylindrical tube, petals that are narrowly to broadly obovate or narrowly to broadly ovate, and small yellow scales alternating with the petals. The anthers are fully exserted. The four smooth, shiny, usually light to medium brown nutlets are 1.3–1.7 mm long by 0.8–1.0 mm wide and ovoid to broadly ovoid in shape. [5]

The pollen of Myosotis petiolata is unknown.

The chromosome number of M. petiolata is unknown; an individual from the South Island previously identified as M. petiolata has a chromosome number of 2n = 36, [11] but South Island plants were excluded from Myosotis petiolata based on morphological and AFLP data. [5]

Distribution and habitat

Myosotis petiolata is currently only known to occur in the Te Waka Range, North Island, New Zealand in the Hawkes Bay region, at c. 900 m ASL, on limestone cliffs and bluffs. [5] [12] It was previously collected in other nearby Hawkes Bay localities. [5]

Conservation status

Myosotis petiolata is listed as Threatened - Nationally Vulnerable in the most recent assessment (2017-2018) of the New Zealand Threatened Classification for plants. [1] The qualifiers "DP" (Data Poor) and "OL" (One Location) are also attached to the assessment. [1]

Myosotis petiolata was featured on RNZ Critter of the Week as "one of the most endangered plants in the country". [12]

Some photos of leaves of cultivated plants.

Related Research Articles

<i>Myosotis pansa <span style="font-style:normal;">subsp.</span> pansa</i> Species of flowering plant

Myosotis pansa subsp. pansa, also known as the Waitakere forget-me-not, is a subspecies of flowering plant in the family Boraginaceae, endemic to the North Island of New Zealand. Lucy Moore described the variety M. petiolata var. pansa in 1961, and it was transferred to a subspecies of M. pansa by Heidi Meudt, Jessica Prebble, Rebecca Stanley and Michael Thorsen in 2013. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white corollas with exserted stamens.

<i>Myosotis retrorsa</i> Species of flowering plant

Myosotis retrorsa is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Heidi Meudt, Jessica Prebble and Rowan Hindmarsh-Walls described the species. Plants of this species of forget-me-not are perennial with a prostrate habit, bracteate inflorescences, and white corollas.

Myosotis umbrosa is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Heidi Meudt, Jessica Prebble and Michael Thorsen described the species. Plants of this species of forget-me-not are perennial with a prostrate habit, bracteate inflorescences, and white corollas.

<i>Myosotis cheesemanii</i> Species of flowering plant

Myosotis cheesemanii is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Donald Petrie described the species in 1886. Plants of this species of forget-me-not are perennial rosettes with bracteate inflorescences and white corollas.

<i>Myosotis matthewsii</i> Species of flowering plant

Myosotis matthewsii is a species of flowering plant in the family Boraginaceae, endemic to the North Island of New Zealand. Lucy Moore described the species in 1961. Plants of this species of forget-me-not are perennial rosettes with bracteate inflorescences and white corollas.

<i>Myosotis tenericaulis</i> Species of flowering plant

Myosotis tenericaulis is a species of flowering plant in the family Boraginaceae, endemic to New Zealand. Donald Petrie described the species in 1918. Plants of this species of forget-me-not are perennial rosettes with creeping, sprawling bracteate inflorescences and white corollas.

<i>Myosotis glauca</i> Species of flowering plant

Myosotis glauca is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. George Simpson and J.S. Thomson described M. pygmaea var. glauca in 1942, and Peter de Lange and John Barkla recognized it at species rank in 2010. Plants of this species of forget-me-not are perennial with a prostrate habit, bracteate inflorescences, white corollas, and often glaucous grey leaves.

<i>Myosotis brevis</i> Species of flowering plant

Myosotis brevis is a species of flowering plant in the family Boraginaceae, endemic to New Zealand. George Simpson and J.S. Thomson described M. pygmaea var. minutiflora in 1942, and Peter de Lange and John Barkla recognized it at species rank in 2010, as M. brevis. Plants of this species of forget-me-not are small and annual, with a prostrate habit, bracteate inflorescences, tiny white corollas, and brown or green leaves.

<i>Myosotis concinna</i> Species of flowering plant

Myosotis concinna is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Thomas Cheeseman described the species in 1885. Plants of this species of forget-me-not are large, perennial rosettes which form loose tufts or clumps, with ebracteate, erect inflorescences, and yellow corollas.

<i>Myosotis laeta</i> Species of flowering plant

Myosotis laeta is a species of flowering plant in the family Boraginaceae, endemic to ultramafic areas of the Sounds-Nelson area of the South Island of New Zealand. Thomas Cheeseman described the species in 1885. Plants of this species of forget-me-not are perennial rosettes which form loose tufts or clumps, with ebracteate, erect inflorescences, and white corollas.

<i>Myosotis rakiura</i> Species of flowering plant

Myosotis rakiura is a species of flowering plant in the family Boraginaceae, endemic to southern South Island and Stewart Island/Rakiura of New Zealand. Joseph Beattie Armstrong described the species in 1881. Plants of this species of forget-me-not are perennial rosettes which form loose tufts or clumps, with ebracteate, erect inflorescences, and white corollas with exserted stamens.

<i>Myosotis goyenii <span style="font-style:normal;">subsp.</span> goyenii</i> Species of flowering plant

Myosotis goyeniisubsp. goyenii is a subspecies of flowering plant in the family Boraginaceae, endemic to southern South Island of New Zealand. Donald Petrie described the species M. goyenii in 1891. Plants of this subspecies of forget-me-not are perennial rosettes which form loose clumps, with ebracteate, erect inflorescences, and white corollas with partly exserted stamens.

<i>Myosotis goyenii <span style="font-style:normal;">subsp.</span> infima</i> Species of flowering plant

Myosotis goyeniisubsp. infima Meudt & Heenan is a subspecies of flowering plant in the family Boraginaceae, endemic to central South Island of New Zealand. Heidi Meudt and Peter Heenan described this subspecies in 2021. Plants of this subspecies of forget-me-not are perennial rosettes which form caespitose clumps, with ebracteate, erect inflorescences, and white corollas with fully incluced stamens.

<i>Myosotis hikuwai</i> Species of flowering plant

Myosotis hikuwai is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Heidi Meudt, Jessica Prebble and Geoff Rogers described M. hikuwai in 2022. Plants of this forget-me-not are spring annuals with bracteate and erect inflorescences, and small, white corollas with inserted stamens. The species is considered Threatened and known only from one population near Wānaka.

<i>Myosotis pansa</i> Species of flowering plant

Myosotis pansa is a species of flowering plant in the family Boraginaceae, endemic to the North Island of New Zealand. Lucy Moore described the variety M. petiolata var. pansa in 1961, and it was raised to species level as M. pansa by Heidi Meudt, Jessica Prebble, Rebecca Stanley and Michael Thorsen in 2013. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white corollas and exserted anthers.

<i>Myosotis pansa <span style="font-style:normal;">subsp.</span> praeceps</i> Subspecies of flowering plant

Myosotis pansa subsp. praeceps is a subspecies of flowering plant in the family Boraginaceae, endemic to the North Island of New Zealand. Lucy Moore described the variety M. petiolata var. pansa in 1961, and it was transferred to a subspecies of M. pansa by Heidi Meudt, Jessica Prebble, Rebecca Stanley and Michael Thorsen in 2013. Plants of this species of forget-me-not are perennial rosettes with partially bracteate inflorescences and white corollas with exserted stamens.

<i>Myosotis pottsiana</i> Species of flowering plant

Myosotis pottsiana is a species of flowering plant in the family Boraginaceae, endemic to the North Island of New Zealand. Lucy Moore described Myosotis petiolata var. pottsiana in 1961. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white corollas with exserted stamens.

<i>Myosotis exarrhena</i> Species of flowering plant

Myosotis exarrhena is a species of flowering plant in the family Boraginaceae, endemic to Australia. Robert Brown described this species as Exarrhena suaveolens in 1810. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white corollas with exserted stamens.

<i>Myosotis saxatilis</i> Species of flowering plant

Myosotis saxatilis is a species of flowering plant in the family Boraginaceae, endemic to New Zealand. Donald Petrie described this species in 1918. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white corollas with stamens that are fully included in the corolla tube or sometimes partly exserted.

<i>Myosotis arnoldii</i> Species of flowering plant

Myosotis arnoldii is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Lucy Moore described the species in 1961. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences, corollas ranging from yellow to dark purple, and stamens that are wholly exserted.

References

  1. 1 2 3 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" (PDF). New Zealand Threat Classification Series. 22: 45. OCLC   1041649797.
  2. ↑ Hooker, Joseph Dalton (1853). The botany of the Antarctic voyage of H.M. discovery ships Erebus and Terror in the Years 1839-1843 :under the command of Captain Sir James Clark Ross. Vol. 2. London: Reeve Brothers. p. 202.
  3. ↑ "Myosotis petiolata". New Zealand Plant Conservation Network. Retrieved 13 May 2023.
  4. ↑ Moore, L.B. "Boraginaceae. In 'Flora of New Zealand'. (Ed. HH Allan) Vol. 1, pp. 806–833". (Government Printer: Wellington, New Zealand) floraseries.landcareresearch.co.nz. Retrieved 27 April 2022.
  5. 1 2 3 4 5 6 7 8 9 10 11 12 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". Australian Systematic Botany. 26 (3): 210. doi:10.1071/SB13023.
  6. ↑ "Isolectotype specimen of Myosotis petiolata". collections.tepapa.govt.nz. Retrieved 20 November 2022.
  7. 1 2 3 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". Plant Systematics and Evolution. 301 (5): 1455–1471. doi:10.1007/s00606-014-1166-x. ISSN   2199-6881.
  8. ↑ Winkworth, Richard C; Grau, Jürke; Robertson, Alastair W; Lockhart, Peter J (1 August 2002). "The origins and evolution of the genus Myosotis L. (Boraginaceae)". Molecular Phylogenetics and Evolution. 24 (2): 180–193. doi:10.1016/S1055-7903(02)00210-5. ISSN   1055-7903.
  9. 1 2 3 Prebble, Jessica; Meudt, Heidi; Tate, Jennifer Alane; Symonds, Vaughan (1 August 2019). "Comparing and co‐analysing microsatellite and morphological data for species delimitation in the New Zealand native Myosotis pygmaea species group (Boraginaceae)". Taxon. 68 (4): 731–750. doi:10.1002/TAX.12096.
  10. ↑ Prebble, Jessica; Tate, Jennifer Alane; Meudt, Heidi; Symonds, Vaughan (9 June 2015). "Microsatellite markers for the New Zealand endemic Myosotis pygmaea species group (Boraginaceae) amplify across species". Applications in Plant Sciences. 3 (6). doi:10.3732/APPS.1500027. PMC   4467761 . PMID   26082880.
  11. ↑ P.J. de Lange; B.G. Murray (2002). "Contributions to a chromosome atlas of the New Zealand flora—37. Miscellaneous families". New Zealand Journal of Botany. 40 (1): 1–23. doi:10.1080/0028825X.2002.9512767. ISSN   0028-825X. Wikidata   Q114954860.
  12. 1 2 "Critter of the Week - Myosotis petiolata". RNZ. 16 April 2021. Retrieved 13 May 2023.
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