Lepidothamnus laxifolius

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Lepidothamnus laxifolius
Lepidothamnus laxifolius kz9.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
(unranked): Gymnospermae
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Podocarpaceae
Genus: Lepidothamnus
Species:
L. laxifolius
Binomial name
Lepidothamnus laxifolius
Hook.f. Quinn.

Lepidothamnus laxifolius, commonly known as the pygmy pine or mountain rimu, is a species of conifer in the family Podocarpaceae. It is endemic to New Zealand, where it is found on North Island, South Island and Stewart Island.

Contents

Distribution

Lepidothamnus laxifolius is a high alpine specialist found in high-altitude bog communities and in scrub, often in association with Halocarpus bidwillii and Podocarpus nivalis . Example locations include Tongariro National Park and Arthur's Pass. On Stewart Island it is found in lowland as well as in montane areas.

Description

It has a scrambling prostrate habit and plants as little as 8 cm in height have been observed in fruit. Branches may be up to 5 mm in diameter and up to 1 metre long. Its cones are red and fleshy, and borne terminally on the horizontal branches. [2] The seed is dark brown on red fleshy scales. [3] It is believed to be the smallest conifer in the world and is rarely bigger than a small low-growing shrub. [4]

Taxonomy

The genus Lepidothamnus was once part of Dacrydium in the classification by Bentham and Hooker in 1880. However, current taxonomy separates it as a distinct genus with three species, one endemic to southern Chile and the other two in New Zealand. All three species have a distinctive cone morphology not shared with other podocarps with its erect ovule, as well as the absence of resin ducts in the leaves. These three species also synthesise cupressuflavone as their major biflavonoid – a feature not found in other podocarps. [5] They have narrow, linear spreading juvenile leaves that gradually change into more strongly keeled and appressed scales. Female cones are borne singly and at the ends of branches and each has 3–5 bracts with very elongated bases. Each fertile bracts supports an erect ovule in its axil and this ovule remains erect throughout its development.

Related Research Articles

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Dacrydium cupressinum, commonly known as rimu, is a large evergreen coniferous tree endemic to the forests of New Zealand. It is a member of the southern conifer group, the podocarps. The former name "red pine" has fallen out of common use.

<i>Podocarpus totara</i> Species of conifer

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<i>Prumnopitys taxifolia</i> Species of conifer

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Podocarpaceae Family of conifers in the family Podocarpaceae

Podocarpaceae is a large family of mainly Southern Hemisphere conifers, comprising about 156 species of evergreen trees and shrubs. It contains 19 genera if Phyllocladus is included and Manoao and Sundacarpus are recognized.

<i>Lagarostrobos</i> Genus of conifers

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Conifer cone Reproductive organ on conifers

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<i>Podocarpus</i> Genus of conifers in the family Podocarpaceae

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<i>Nageia</i> genus of conifers in the family Podocarpaceae

Nageia is a genus of conifers belonging to the podocarp family Podocarpaceae. Nageia includes evergreen shrubs and trees, from one to 54 meters in height. A 2009 treatment of the genus recognized five species. Some authors consider Nageia formosensis to be a separate species from Nageia nagi, thus recognizing six species. The podocarp genera have been reshuffled by various botanists. Most recently, several species formerly classed as Nageia were moved to the new genus Retrophyllum, while Nageia falcata and Nageia mannii were moved to the new genus Afrocarpus.

<i>Afrocarpus</i> Genus of conifers

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<i>Dacrydium</i> Genus of conifers

Dacrydium is a genus of conifers belonging to the podocarp family Podocarpaceae. Sixteen species of evergreen dioecious trees and shrubs are presently recognized. The genus was first described by Solander in 1786, and formerly included many more species, which were divided into sections A, B, and C by Florin in 1931. The revisions of de Laubenfels and Quinn, reclassified the former section A as the new genus Falcatifolium, divided Section C into new genera Lepidothamnus, Lagarostrobos and Halocarpus, and retained Section B as genus Dacrydium.

<i>Lepidothamnus</i> Genus of conifers

Lepidothamnus is a genus of conifers belonging to the podocarp family Podocarpaceae. The genus includes three species of dioecious or monoecious evergreen trees and shrubs, and creepers. L. intermedius and L. laxifolius are native to New Zealand. L. fonkii is native to the Magellanic subpolar forests ecoregion of southern Argentina and Chile, where it grows as a low shrub or creeper in moorlands and bogs.

<i>Manoao</i> Genus of conifers

Manoao is a monotypic genus in the family Podocarpaceae. The single species, M. colensoi, known as manoao (Māori), silver pine, Westland pine, or white silver pine, is endemic to New Zealand. Before 1996 it was classified in genus Dacrydium or Lagarostrobos, but has recently been recognised as a distinct genus; some botanists still treat it in Lagarostrobos on the basis that it is not phylogenetically distinct from that genus. In molecular phylogenetic analyses Manoao was found to be related to Parasitaxus and Lagarostrobos, but their exact relationships are unresolved.

<i>Halocarpus bidwillii</i> Species of conifer

Halocarpus bidwillii, commonly known as the mountain pine or bog pine, is a species of conifer in the family Podocarpaceae. It is endemic to New Zealand.

Dacrydium guillauminii, commonly known as cat-tail Rimu or swamp Dacrydium, is a species of conifer in the family Podocarpaceae. It is found only in New Caledonia. It is a slow growing shrub or small tree with roots that grow in water, and reaches a height between 1 and 2 metres.

<i>Lepidothamnus intermedius</i> Species of conifer

Lepidothamnus intermedius, the yellow silver pine, is a species of conifer in the family Podocarpaceae. It is endemic to New Zealand.

<i>Libocedrus bidwillii</i> Species of conifer

Libocedrus bidwillii, also called pāhautea, kaikawaka or New Zealand cedar, is a species of Libocedrus, endemic to New Zealand. It is in the cypress family Cupressaceae.

<i>Phyllocladus toatoa</i> Species of conifer

Phyllocladus toatoa, known as toatoa (Māori) or blue celery pine is a species of conifer in the family Podocarpaceae, endemic to New Zealand. It was formerly referred to as P. glaucus.

<i>Podocarpus nivalis</i> Species of conifer

Podocarpus nivalis, the mountain or snow tōtara, is a species of conifer in the family Podocarpaceae. It is endemic to New Zealand.

<i>Retrophyllum rospigliosii</i> Species of conifer

Retrophyllum rospigliosii is a species of conifer in the family Podocarpaceae. It is a large evergreen tree native to the montane rainforests of Venezuela, Colombia, Peru, Ecuador and Bolivia in South America.

Retrophyllum vitiense is a species of conifer in the family Podocarpaceae. It is a large evergreen rainforest emergent tree native to Fiji, Indonesia, Papua New Guinea, and Solomon Islands.

References

  1. Thomas, P. (2013). "Lepidothamnus laxifolius". IUCN Red List of Threatened Species . 2013: e.T42481A2982106. doi: 10.2305/IUCN.UK.2013-1.RLTS.T42481A2982106.en . Retrieved 15 November 2021.
  2. Dallimore, William, Albert Bruce Jackson, and S.G. Harrison. 1967. A Handbook of Coniferae and Ginkgoaceae, 4th ed. New York: St. Martin's Press. xix, 729 p.
  3. Eagle, Audrey (2008). Eagle's complete trees and shrubs of New Zealand volume one. Wellington: Te Papa Press. p. 26. ISBN   9780909010089.
  4. Dobson Nature Walk: the Natural History of an Alpine Pass, New Zealand Department of Conservation, 2006, ISBN   0-478-14068-1
  5. Quinn, C J (1982). "Taxonomy of Dacrydium Sol. Ex Lamb. Emend. De Laub. (Podocarpaceae)" . Australian Journal of Botany. 30 (3): 311. doi:10.1071/BT9820311. ISSN   0067-1924 via CSIRO.