Myosotis brockiei subsp. dysis

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Myosotis brockiei subsp. dysis
Status NZTCS NV.svg
Nationally Vulnerable (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. brockiei
Subspecies:
M. b. subsp. dysis
Trinomial name
Myosotis brockiei subsp. dysis
Courtney & Meudt [2]

Myosotis brockieisubsp. dysis is a subspecies of flowering plant in the family Boraginaceae, endemic to southern South Island of New Zealand. Shannel Courtney and Heidi Meudt described this subspecies in 2021. Plants of this subspecies of forget-me-not are perennial rosettes which form stoloniferous mats, with long, ebracteate, erect inflorescences, and white corollas with exserted stamens.

Contents

Taxonomy and etymology

Myosotis brockiei subsp. dysis Courtney & Meudt is in the plant family Boraginaceae. The species M. brockiei was described by Lucy Moore and Margaret Simpson in 1973, [2] [3] [4] whereas the subspecies dysis was described in 2021. [2]

The holotype specimen of Myosotis brockiei subsp. dysis was collected from Lake Otuhie, Western Nelson, by Michael Thorsen and is housed at the herbarium of the Museum of New Zealand Te Papa Tongarewa (WELT SP089878). [5] [2] There are also isotypes at Manaaki Whenua - Landcare Research Allan Herbarium (CHR 596689/A and CHR 596689/B). [6] [7] [2]

The subspecies name dysis is one of the Greek Horae (hours) or daughters of Chronos (time), and is in reference to the west, where the sun sets, reflecting the western distribution of this subspecies relative to the other subspecies. [2]

This is one of two subspecies recognized in M. brockiei; the other is M. brockiei subsp. brockiei . [2] The subspecies are allopatric, as M. brockiei subsp. dysis is found in lower elevations near the coast on limestone or other calcicolous substrates, whereas M. brockiei subsp. brockiei is found at higher elevations in montane and subalpine in habitats with limestone or other calcicolous or ultramafic substrates. Myosotis brockiei subsp. dysis differs from M. brockiei subsp. brockiei by three minor characters, i.e. its habit (stoloniferous mats instead of single rosettes or tufts instead), obtuse apices of the lower cauline leaves, and lack of retrorse (backward facing) hairs on the scape below the flowering portion of the inflorescence. [2] [8]

Phylogeny

Myosotis brockiei subsp. dysis has not yet been included in any phylogenetic analyses. [9] [10]

Description

Myosotis brockiei subsp. brockiei plants are single rosettes that often grow together to form stoloniferous mats. The rosette leaves have petioles 16–41 mm long. The rosette leaf blades are usually 15–50mm long by 4–20 mm wide (length: width ratio 2.5–3.6: 1), oblanceolate or rarely narrowly obovate, widest at or above the middle, with an obtuse apex. The upper surface of the leaf is densely covered in mostly flexuous, some curved, patent to erect, antrorse (forward-facing) hairs that are oriented oblique to the mid vein. The hairs on the edges are similar but mostly erect, and the hairs on the underside of the leaf are also similar but mostly retrorse (backward-facing) and can be oriented parallel or oblique to the mid vein. Each rosette has 1–6 erect, usually once-branched (sometimes unbranched), ebracteate inflorescences that are up to 385 mm long and are bifurcating in an open, forked 'V' shape near the tips. The cauline leaves are similar to the rosette leaves but smaller with shorter petioles, and decrease in size toward the tip. Each inflorescence has up to 47 flowers, each borne on a pedicel up to 13 mm long at fruiting, and each without a bract. The scape below the flowering portion of the inflorescence has hairs that are antrorse to erect (with some retrorse only at the very base). The calyx is 2–7 mm long at flowering and 3–9 mm long at fruiting, lobed to half to three-quarters of its length, and densely covered in mostly antrorse (retrorse near the base), mostly patent and flexuous hairs. The corolla is white, up to 13 mm in diameter, with a cylindrical tube, petals that are narrowly ovate, obovate or broadly obovate, and small yellow scales alternating with the petals. The anthers are fully exserted above the scales. The four smooth, shiny, light to dark brown nutlets are 1.8–2.5 mm long by 1.0–1.3 mm wide and narrowly ovoid or ovoid in shape. [2]

The chromosome number of M. brockiei subsp. dysis is unknown.

The pollen of M. brockiei subsp. dysis is unknown.

It flowers and fruits from December–January. [2]

Distribution and habitat

Myosotis brockiei subsp. dysis is a forget-me-not subspecies endemic to Western Nelson, South Island, New Zealand from 0–260 m ASL. It is found on faces or ledges of limestone cliffs, on sites with a lowland climate near the coast, and is considered to be an obligate calcicole. [11] [2]

Conservation status

The species is listed as Threatened - Nationally Vulnerable on the most recent assessment (2017-2018; as Myosotis aff. brockiei (a) (CHR 497375; Lake Otuhie)) under the New Zealand Threatened Classification system for plants, with the qualifier "OL" (One Location). [1] [2]

Related Research Articles

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

Myosotis brockiei is a species of flowering plant in the family Boraginaceae, endemic to southern South Island of New Zealand. Lucy Moore and Margaret Simpson described the species in 1973. 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 brockiei <span style="font-style:normal;">subsp.</span> brockiei</i> Species of flowering plant

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

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

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

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

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

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<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 australis</i> Species of flowering plant

Myosotis australis is a species of flowering plant in the family Boraginaceae, native to New Zealand, Australia and New Guinea. Robert Brown described this species in 1810. Plants of this species of forget-me-not are perennial rosettes with ebracteate inflorescences and white or yellow corollas with stamens that are fully included in the corolla tube or sometimes partly protruded.

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

Myosotis australissubsp. australis is a subspecies of flowering plant in the family Boraginaceae, native to New Zealand and Australia. Robert Brown described M. australis in 1810. Plants of this subspecies of forget-me-not are perennial rosettes with ebracteate inflorescences and white or yellow corollas with stamens that are fully included in the corolla tube or sometimes partly protruded.

Myosotis australissubsp. saruwagedica is a subspecies of flowering plant in the family Boraginaceae, endemic to New Guinea. August Brand described the species M. saruwagedica in 1929 and it was considered to be a synonym or a subspecies of M. australis by subsequent authors. Plants of this subspecies of forget-me-not are perennial rosettes with ebracteate inflorescences and white or yellow corollas with stamens that are fully included in the corolla tube or sometimes partly protruded.

References

  1. 1 2 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. 1 2 3 4 5 6 7 8 9 10 11 12 Meudt, Heidi (2021). "Taxonomic revision of five species groups of ebracteate-erect Myosotis (Boraginaceae) endemic to New Zealand, based on morphology, and description of new subspecies". Australian Systematic Botany. 34 (3): 252–304. doi:10.1071/SB20028. S2CID   234771910.
  3. ↑ "Myosotis brockiei". New Zealand Plant Conservation Network. Retrieved 3 September 2022.
  4. ↑ Moore, Lucy Beatrice; Simpson, Margaret Jane Annand (1 March 1973). "A New Myosotis from North-west Nelson". New Zealand Journal of Botany. 11 (1): 163–170. doi: 10.1080/0028825X.1973.10430270 .
  5. ↑ "Holotype of Myosotis brockiei subsp. dysis". collections.tepapa.govt.nz. Retrieved 17 September 2022.
  6. ↑ "Isotype of Myosotis brockiei subsp. dysis". scd.landcareresearch.co.nz. Retrieved 17 September 2022.
  7. ↑ "Isotype of Myosotis brockiei subsp. dysis". scd.landcareresearch.co.nz. Retrieved 17 September 2022.
  8. ↑ "Meet three new subspecies of forget-me-nots". Te Papa’s Blog. 13 December 2021. Retrieved 25 September 2022.
  9. ↑ Winkworth, Richard C.; Grau, Jürke; Robertson, Alastair William; 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. PMID   12144755.
  10. ↑ Meudt, Heidi M.; Prebble, Jessica M.; Lehnebach, Carlos A. (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. S2CID   14686750.
  11. ↑ Rogers, Geoff; Courtney, Shannel P.; Heenan, Peter Brian (2018). "The Calcicolous Flora of New Zealand: Profiles of Life Form, Taxonomy, Biogeography and Conservation Status". Science for Conservation. 331: 1–37.
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