Myosotis glabrescens

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Myosotis glabrescens
Status NZTCS DD.svg
Data Deficient (NZ TCS) [1]
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Boraginales
Family: Boraginaceae
Genus: Myosotis
Species:
M. glabrescens
Binomial name
Myosotis glabrescens

Myosotis glabrescens 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 tightly compacted, perennial mats with bracteate inflorescences and white corollas.

Contents

Taxonomy and etymology

Myosotis glabrescens L.B.Moore is in the plant family Boraginaceae and was originally described in 1961 by Lucy Moore. [3] [4] M. glabrescens is morphologically most similar to the common cushion species, M. pulvinaris, but can be distinguished from it (and indeed many other bracteate-prostrate species) by numerous floral characters, including its long, exserted filaments (> 0.5 mm long) which are attached at the faucal scales, its long anthers (0.9–1.1 mm long) which are completely exserted past the faucal scales, and its long calyx lobes which are longer than half the length of the calyx. [5]

The type specimen of Myosotis glabrescens is lodged at the Museum of New Zealand Te Papa Tongarewa, Wellington (herbarium WELT). [6] [5]

The specific epithet, glabrescens, is derived from the Latin words glaber, meaning hairless or smooth, and the suffix -escens, meaning becoming or resembling. [5] The leaf hairs of M. glabrescens are ‘early deciduous’ and ‘soon falling so that most of plant is glab[rous]’. [4]

Phylogeny

Myosotis glabrescens was shown to be a part of the monophyletic southern hemisphere lineage of Myosotis in phylogenetic analyses of standard DNA sequencing markers (nuclear ribosomal DNA and chloroplast DNA regions). [7] Within the southern hemisphere lineage, species relationships were not well resolved. [7]

Description

Myosotis glabrescens plants are rosettes tightly compacted into mats that may reach 1m in diameter. The rosette leaves have petioles 1–2 mm long. The rosette leaf blades are 2–3 mm long by 2–5 mm wide (length: width ratio 0.6–1.3: 1), broadly ovate, very broadly ovate, rotund or circular, widest at or below the middle, with an obtuse apex. Both surfaces of the leaf are sparsely to densely covered in straight (mostly) or flexuous, appressed (mostly) or patent, antrorse (forward-facing) hairs that are parallel to the mid vein, whereas the petiole is glabrous on the upper surface. Each rosette has a few prostrate to ascending, once-branched, bracteate, single-flowered inflorescences that are 29–46 mm long. The cauline leaves are very similar to the rosette leaves. The solitary flowers are borne on a short pedicel with a bract. The calyx is 3–4 mm long at flowering and c. 4 mm long at fruiting, lobed to about two-thirds of its length, and densely covered in straight (rarely flexuous), appressed to patent, antrorse hairs. The corolla is white and 4–6 mm in diameter, with a cylindrical tube, petals that are obovate to ovate and flat, and small yellow scales alternating with the petals. The anthers are fully exserted. The four smooth, shiny, medium brown nutlets are 1.6–1.8 mm long by c. 0.9 mm wide and narrowly ovoid to ovoid in shape. [5]

Myosotis glabrescens has M. angustata type pollen. [8] [9]

The chromosome number of M. glabrescens is unknown.

Myosotis glabrescens flowers and fruits from January–February. [5]

Distribution and habitat

Myosotis glabrescens is endemic to the South Island of New Zealand in Otago, from 1400 to 1830 m ASL. M. glabrescens is found in wet areas including stream headwaters in high-elevation, subalpine shingle banks. [5]

Conservation status

The species is listed as Data Deficient in the most recent assessment (2017-2018) of the New Zealand Threatened Classification for plants. At least one new population has been found since that listing. [10]

Related Research Articles

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

Myosotis monroi is a species of flowering plant in the family Boraginaceae endemic to the South Island of New Zealand. The species was described by Thomas Cheeseman. Plants of this species of forget-me-not are perennial and erect, and have ebracteate inflorescences with cream or white corollas.

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

Myosotis antarctica is a species of flowering plant in the family Boraginaceae, native to Campbell Island of New Zealand and southern Chile. Joseph Dalton Hooker described the species in his 19th century work Flora Antarctica. Plants of this species of forget-me-not are perennial and have white or blue corollas. It is one of two native species of Myosotis in the New Zealand subantarctic islands, the other being M. capitata, which also has blue corollas.

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

Myosotis eximia is a species of flowering plant in the family Boraginaceae endemic to the North Island of New Zealand. The species was described by Donald Petrie. Plants of this species of forget-me-not are perennial and erect, and have ebracteate inflorescences with white corollas.

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

Myosotis capitata is a species of flowering plant in the family Boraginaceae, endemic to the Campbell and Auckland Islands of New Zealand. Joseph Dalton Hooker described the species in his 19th century work Flora Antarctica. Plants of this species of forget-me-not are perennial and erect, and have ebracteate inflorescences and blue corollas. It is one of two native species of Myosotis in the New Zealand subantarctic islands, the other being M. antarctica, which can also have blue corollas.

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

Myosotis chaffeyorum is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Carlos Lehnebach described the species. Plants of this species of forget-me-not are perennial with a creeping habit, bracteate inflorescences, and white corollas.

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

Myosotis bryonoma 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 creeping habit, bracteate inflorescences, and white corollas.

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 albiflora</i> Species of flowering plant

Myosotis albiflora is a species of flowering plant in the family Boraginaceae, native to southern Chile and Argentina. This species was described by Joseph Banks and Daniel Solander in Joseph Dalton Hooker's 19th century work Flora Antarctica. Plants of this species of forget-me-not are perennial and have white corollas. It is one of two native species of Myosotis in southern South America, the other being M. antarctica.

<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 colensoi</i> Species of flowering plant

Myosotis colensoi is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Thomas Kirk described the species in 1896. 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 pulvinaris</i> Species of flowering plant

Myosotis pulvinaris is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Joseph Dalton Hooker described the species in 1867. Plants of this species of forget-me-not are perennial with a prostrate, compact, cushion habit, short bracteate inflorescences, and white corollas.

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

Myosotis spatulata is a species of flowering plant in the family Boraginaceae, endemic to New Zealand. Georg Forster described the species in 1786. 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 uniflora</i> Species of flowering plant

Myosotis uniflora is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Joseph Dalton Hooker described the species in 1867. Plants of this species of forget-me-not are perennial with a prostrate, compact, cushion or mat habit, short bracteate inflorescences, and cream to yellow corollas.

Myosotis lyallii is a species of flowering plant in the family Boraginaceae, endemic to New Zealand. Joseph Dalton Hooker described the species in 1853. Plants of this species of forget-me-not are perennial with a prostrate habit, bracteate or partially-bracteate inflorescences, and white corollas.

<i>Myosotis lyallii <span style="font-style:normal;">subsp.</span> elderi</i>

Myosotis lyalliisubsp. elderi is a subspecies of flowering plant in the family Boraginaceae, endemic to New Zealand. Lucy Moore described Myosotis elderi in 1961, and Heidi Meudt and Jessie Prebble treated it as a subspecies of M. lyallii in 2018. Plants of this subspecies of forget-me-not are perennial with a prostrate habit, bracteate inflorescences, and white corollas with partially exserted anthers.

Myosotis lyalliisubsp. lyallii is a subspecies of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand. Joseph Dalton Hooker described M. lyallii in 1853. Plants of this subspecies of forget-me-not are perennial with a prostrate habit, bracteate or partially-bracteate inflorescences, and white corollas, usually with exserted anthers.

<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.

References

  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" (PDF). New Zealand Threat Classification Series. 22: 1–86. OCLC   1041649797.
  2. ↑ 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.
  3. ↑ "Myosotis glabrescens". New Zealand Plant Conservation Network. Retrieved 18 June 2022.
  4. 1 2 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 Meudt, Heidi M.; Prebble, Jessica M. (28 February 2018). "Species limits and taxonomic revision of the bracteate-prostrate group of southern hemisphere forget-me-nots (Myosotis, Boraginaceae), including description of three new species endemic to New Zealand". Australian Systematic Botany. 31 (1): 48–105. doi:10.1071/SB17045. ISSN   1446-5701.
  6. ↑ "Myosotis glabrescens". collections.tepapa.govt.nz. Retrieved 18 June 2022.
  7. 1 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". Plant Systematics and Evolution. 301 (5): 1455–1471. doi:10.1007/s00606-014-1166-x. ISSN   2199-6881.
  8. ↑ Meudt, HM (1 October 2016). "Pollen morphology and its taxonomic utility in the Southern Hemisphere bracteate-prostrate forget-me-nots (Myosotis, Boraginaceae)". New Zealand Journal of Botany. 54 (4): 475–497. doi:10.1080/0028825X.2016.1229343. ISSN   0028-825X. S2CID   89118799.
  9. ↑ "Myosotis glabrescens". collections.tepapa.govt.nz. Retrieved 18 June 2022.
  10. ↑ "Finding 'Data Deficient' forget-me-nots". Te Papa’s Blog. 31 August 2020. Retrieved 18 June 2022.
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