Dracophyllum densum

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Dracophyllum densum
Dracophyllum densum.jpg
Status NZTCS D.svg
Declining (NZ TCS) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Ericales
Family: Ericaceae
Genus: Dracophyllum
Species:
D. densum
Binomial name
Dracophyllum densum
Dracophyllum densum map.svg
  Range

Dracophyllum densum is a species of shrub endemic to north-west Nelson in New Zealand's South Island. It was first described by Walter Oliver in 1952 and gets the specific epithet densum for its leaves growing densely. In the heath family Ericaceae, it inhabits mountain summits, plateaux, and ridge lines and reaches a height of 0.3–0.5 m (1–2 ft). [2] [3] A 2017 assessment using the New Zealand Threat Classification System classified it as "Declining", giving it an estimated population of more than 100,000. [1]

Contents

Description

Dracophyllum densum is a small shrub or subshrub, reaching heights of just 0.3–0.5 m (1–2 ft), which grows prostrate (along the ground) or occasionally decumbent (ends of branches reaching up). [3]

Taxonomy

Dracophyllum densum was first described by the New Zealand naturalist and ornithologist Walter Oliver (1883–1957) in a 1952 issue of the Transactions and Proceedings of the New Zealand Institute. [note 1] He noted, in what was a supplement to his 1928 publication, the first major monograph of the genus, [4] that it was "a low, often prostrate, much branched shrub, with dense foliage." He designated the type specimen as one he had collected on Mount Rochfort in March of 1949. [5]

Etymology

Dracophyllum is from the genus's similarity to the species in the genus Dracaena from the Canary Islands and is from the Ancient Greek for "dragon-leaf". [6] The specific epithet densum, latin for dense or compact, is for its leaves growing in dense clumps or groups. [3]

Phylogeny

In Oliver's 1952 article, which supplemented his 1928 article in which he had originally set out the subgenera, he placed it in the subgenus Oreothamnus in the group of D. pearsoni, together with D. politum, and D. pearsoni. Its inclusion in the subgenus was due to its similarities with D. politum, differing only by its smaller leaves and leaf sheaths, and their olive green colour when dry. [5] [7] In 2010 several botanists published an article on the genus Dracophyllum in the Annals of the Missouri Botanical Garden . In it they performed a cladistic analysis and produced a phylogenetic tree of the tribe Richeeae and other species using genetic sequencing. They found that only the subgenus Oreothamnus and the tribe Richeeae were monophyletic. The paraphylly of the genus Dracophyllum, as well as the polyphyly of the closely related genus Richea, they argued, suggested that a major taxonomic revision was required. [8] The New Zealand botanist Stephanus Venter revised the genus in 2021, merging the genus Richea into two subgenera, named D. Subg. Cystanthe and D. Subg.Dracophylloides, of Dracophyllum. Though he noted that because the 2010 study was based on plastid sequence data and did not attain some species with strong enough evidence, the subgenera are instead based on morphological characteristics. D. densum is kept in the subgenus Oreothamnus under his assessment. [9]

D. densum is placed in the clade formed by several subgenus Oreothamnus species, with D. strictum (in the subgenus Dracophyllum) as sister to this clade. Its placement can be summarised in the following cladogram:

D. acerosum

D. densum

D. filifolium

D. kirkii

D. ophioliticum

D. patens

D. rosmarinifolium  

D. trimorphum

D. arboreum

D. longifolium

D. muscoides

D. pronum

D. scoparium

D. strictum

D. fiordense

D. menziesii

D. latifolium

D. townsonii

D. traversii

other Dracophyllum spp.

Cladogram showing the phylogeny of selected species within the genus Dracophyllum, from research published in 2010.
  Subgenus Oreothamnus
  Subgenus Dracophyllum

Related Research Articles

<i>Dracophyllum</i> Genus of flowering plants

Dracophyllum is a genus of plants belonging to the family Ericaceae, formerly Epacridaceae. There are 61 species in the genus, mostly shrubs, but also cushion plants and trees, found in New Zealand, Australia, Lord Howe Island and New Caledonia. The name Dracophyllum, meaning dragon-leaf, refers to their strong outward similarity to the unrelated Dracaena, sometimes known as dragon tree. Although dicotyledonous, they resemble primitive monocots with their slender leaves concentrated in clumps at the ends of the branches; they are sometimes called grass-trees.

<i>Dracophyllum longifolium</i> Species of flowering plant

Dracophyllum longifolium, commonly called inaka, is an upright shrub or small tree in the family Ericaceae that is endemic to New Zealand.

<i>Dracophyllum arboreum</i> Species of tree in the heath family from the Chatham Islands

Dracophyllum arboreum, commonly known as Chatham Island grass tree and tarahinau (Moriori), is a species of tree in the heath family Ericaceae. Endemic to the Chatham Islands of New Zealand, it reaches a height of 18 m (60 ft) and has leaves that differ between the juvenile and adult forms.

<i>Dracophyllum traversii</i> Species of tree (mountain neinei)

Dracophyllum traversii, commonly known as mountain neinei, grass tree, and pineapple tree is a species of flowering plant in the heath family Ericaceae. It is a deciduous tree endemic to New Zealand. It reaches a height of 0.2–13 m (0.66–42.65 ft) and has leaves which form tufts at the end of its branches. It has a lifespan of between 500 and 600 years.

<i>Dracophyllum ophioliticum</i> Species of shrub

Dracophyllum ophioliticum, commonly known as asbestos inaka and asbestos turpentine tree, is a species of shrub in the family Ericaceae. Endemic to New Zealand, it grows into a sprawling shrub, reaching heights of just 30–200 cm (10–80 in), and has leaves which form bunches at the end of its branches.

<i>Dracophyllum muscoides</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum muscoides, commonly known as cushion inaka, is a small cushion plant in the family Ericaceae. It is endemic to New Zealand and is found only in the South Island in sub-alpine regions.

<i>Dracophyllum townsonii</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum townsonii is a species of shrub or small tree endemic to the north of New Zealand's South Island. It was first described by Thomas Cheeseman in 1906 and gets the specific epithet townsonii after the chemist and plant collector William Townson. In the heath family Ericaceae, it inhabits mountain slopes and reaches a height of 3–6 m.

<i>Dracophyllum verticillatum</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum verticillatum is a species of shrub or small tree endemic to New Caledonia. It was first described by Jacques Labillardière in 1800 and gets the specific epithet verticillatum for its flowers growing on verticillasters. In the heath family Ericaceae, it inhabits exposed plains and gentle mountain slopes and reaches a height of 0.2–7 m tall.

<i>Dracophyllum pronum</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum pronum, commonly known as Trailing neinei, is a species of sprawling shrub endemic to New Zealand. It was first described by Walter Oliver in 1928 and gets the specific epithet pronum for its prostrate growth habit. In the heath family Ericaceae, it inhabits montane and subalpine areas and reaches a height of just 1–25 cm.

<i>Dracophyllum scoparium</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum scoparium is a species of shrub or small tree endemic to the Chatham Islands of New Zealand. It was first described by Joseph Dalton Hooker in 1844 and gets the specific epithet scoparium, in the form of a broom, for the way in which its juvenile leaves grow. In the heath family Ericaceae, it inhabits the Chatham and Pitt Islands, and reaches a height of 1–4 m.

<i>Dracophyllum strictum</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum strictum, commonly known as totorowhiti, is a species of shrub endemic to New Zealand. It was first described by Joseph Dalton Hooker in 1844 and gets the specific epithet strictum for its rigid and packed together leaves. In the heath family Ericaceae, it inhabits lowland up to montane forest and shrubland and reaches a height of 50–300 cm.

<i>Dracophyllum ramosum</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum ramosum is a species of shrub or small tree in the family Ericaceae and is endemic to New Caledonia. It was first described by Adolphe-Théodore Brongniart and Jean Antoine Arthur Gris in 1864 and gets the specific epithet ramosum for the fact that many of its branches grow from the same place. It inhabits the summits and slopes of mountains, alongside streams, and on plateaux; it reaches a height of 0.5–5 m.

Dracophyllum ouaiemense is a species of shrub in the family Ericaceae and is endemic to New Caledonia. It was first described by Robert Virot in 1975 and gets the specific epithet ouaiemense after the region in which it grows: Roche Ouaième. It inhabits the tops of mountains and more gentle slopes and reaches a height of 50 cm.

<i>Dracophyllum menziesii</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum menziesii, commonly known as pineapple scrub, is a species of shrub endemic to the South and Stewart Islands of New Zealand. In the heath family Ericaceae, it inhabits mountain slopes and cliffs from sea level up to 1,500 m (4,921 ft) and reaches a height of 0.5–1 m (1.6–3.3 ft). A 2017 assessment using the New Zealand Threat Classification System classified it as "Not Threatened", giving it an estimated population upwards of 100,000.

<i>Dracophyllum rosmarinifolium</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum rosmarinifolium, commonly known as inaka and common grass tree, is a species of shrub endemic to the North and South Islands of New Zealand. It was first described by Georg Forster in 1786 as Eparcris rosmarinifolium and gets the specific epithet rosmarinifolium for its similarities to species from the former genus Rosmarinus. In the heath family Ericaceae, it inhabits subalpine and montane gullies, cliffs, plateaux, valley floors and ridges, and reaches a height of 0.3–1 m (1.0–3.3 ft). A 2017 assessment using the New Zealand Threat Classification System classified it as "Not Threatened," giving it an estimated population of over 100,000.

<i>Dracophyllum fiordense</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum fiordense, commonly known as the Fiordland grass tree, is a species of tree or shrub in the heath family, Ericaceae. It is endemic to the South Island of New Zealand. It reaches a height of 1.5–5.0 metres and has tufts of long green leaves at the ends of its branches. Each leaf has a distinctive curled spiral tip. D. fiordense has a pyramid-shaped inflorescence hidden under each clump of leaves, with between 113 and 120 pink flowers on each spike, and later reddish-brown dry fruit; both are around just 2 by 2 mm. It inhabits shrubland, lowland and subalpine forests, and tussock grassland of mountain slopes, gullies, and ridges. Its range covers two main areas: one in Fiordland National Park, and one in the Mount Cook and Westland National Parks.

<i>Dracophyllum trimorphum</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum trimorphum, commonly known as inaka and dracophyllum, is a species of shrub or small tree endemic to north-west Nelson in New Zealand's South Island. It was first described by Walter Oliver in 1952 and gets the specific epithet trimorphum for its three phases of growth. In the heath family Ericaceae, it inhabits cliffs and steep slopes near the coast and reaches a height of 0.2–3.0 m (1–10 ft). A 2017 assessment using the New Zealand Threat Classification System classified it as “Naturally Uncommon,” giving it an estimated habitat area of less than 10 km2 (1,000.0 ha).

<i>Dracophyllum kirkii</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum kirkii is a species of shrub endemic to the South Island of New Zealand. It was first described by Sven Berggren in 1877 and gets the specific epithet kirkii after the New Zealand botanist Thomas Kirk. In the heath family Ericaceae, it inhabits mountain slopes and bluffs and reaches a height of just 20–140 cm (8–55 in). A 2017 assessment using the New Zealand Threat Classification System classified it as "Not Threatened", giving it an estimated population of more than 100,000.

<i>Dracophyllum filifolium</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum filifolium is a species of shrub or tree endemic to the North, South, and Stewart Islands of New Zealand. It was first described by Joseph Dalton Hooker in 1853 and gets the specific epithet filifolium for its leaves being like a filament. In the heath family Ericaceae, it inhabits mountain slopes, saddles and ridges and reaches a height of 1–4 m (3–13 ft). A 2017 assessment using the New Zealand Threat Classification System classified it as "Not Threatened", giving it an estimated population of more than 100,000.

<i>Dracophyllum acerosum</i> Species of flowering plant in the heath family Ericaceae

Dracophyllum acerosum is a species of shrub or small tree endemic to New Zealand's South Island. It was first described by Sven Berggren in 1877 and gets the specific epithet acerosum, meaning needles shaped, for its leaves. In the heath family Ericaceae, it inhabits mountain slopes, ridge lines and hillsides and reaches a height of 1–2 m (3–7 ft). A 2017 assessment using the New Zealand Threat Classification System classified it as "Not Threatened", giving it an estimated population of more than 100,000.

References

    Notes

    Citations

    Bibliography

    Journals

    • Venter, Stephanus (March 2021). "A taxonomic revision of the Australasian genera Dracophyllum and Richea (Richeeae: Styphelioideae: Ericaceae)". Australian Systematic Botany. 34 (2). doi:10.1071/SB19049_CO. ISSN   1030-1887.
    • Oliver, Walter R. B. (1952). "A Revision of the Genus Dracophyllum: Supplement". Transactions and Proceedings of the Royal Society of New Zealand . 80 via the Internet Archive.
    • Wagstaff, Steven J.; Dawson, Murray I.; Venter, Stephanus; Munzinger, Jérôme; Crayn, Darren M.; steane, Dorothy A; Lemson, Kristina L. (2010). "Origin, Diversification, and Classification of the Australasian Genus Dracophyllum (Richeeae, Ericaceae) 1". Annals of the Missouri Botanical Garden. 97 (2): 235–258. doi:10.3417/2008130. ISSN   0026-6493. JSTOR   40732242. S2CID   3933162.

    Websites

    Books

    • Eagle, Audrey (2006). Eagle's complete trees and shrubs of New Zealand. Vol. 2. New Zealand: Te Papa Press. ISBN   0-909010-08-0.