Laricoideae

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Laricoideae
Subalpine larch (Larix lyallii) in Wenatchee National Forest, Washington, U.S.
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Pinaceae
Subfamily: Laricoideae
(Rendle) Pilg. & Melch. (1954)
Type genus
Larix

Genera

The Laricoideae are a

timber and non-timber forest products
.

Description

The

insects are a clue of a common ancestral origin. Similar between the two genera are also some aspects of the phenology, the degree of shade tolerance, the fire-resistant marbled bark and the appearance of the young shoots.[citation needed
]

Taxonomy

The

Larix as a distinct twin group compared to Cathaya - Pseudotsuga.[citation needed
]

Historically the Laricoideae were the subfamily of the Pinaceae comprising the trees with needles inserted both on the macroblasts and on the brachiblasts; for this reason in the past they have been also included in it the genera Pseudolarix (for a short time) and Cedrus, subsequently eliminated following the most recent systematic updates developed on the basis of molecular genetic phylogeny, reproductive morphology, chromosome numbers and immunology. Currently, based on these studies, there are three genera in the subfamily Laricoideae, of which one of which is monotypic as it consists of only one species:[1]

Image Genus Description Living species
Larix Mill.
temperate zones or at high latitudes in the Northern Hemisphere. They are found in North America, Central Europe and Northern Asia (Russia, Japan and China
).
Carrière
Eastern Asia, where they can reach 100 m in height (Pseudotsuga menziesii var. menziesii
).
Cathaya Chun & Kuang Monotypic
Cathaya argyrophylla. The leaves are needle-like, evergreen, 2.5–5 cm long with ciliates margins when young; they grow in spiral patterns around sprig. Cones 3–5 cm long with 15-20 scales, each scale bearing two winged seeds. This conifer grows in Southern China, in provinces of Guangxi, Guizhou, Hunan and southeast Sichuan
on steep mountain slopes between the 950 and 1800 m of altitude.
  • Cathaya argyrophylla
     Chun & Kuang

Within the

external wall (exospore) granular, pollination drop containing xylose[6]
and the presence of an exine shell during microgametophyte germination. Doyle and O'Leary (1935)
genera may be over a year and the granules germination can take months (Little et al., 2014).[5]

Larix and Pseudotsuga are sister genera compared to Cathaya

Price et al. he supposed in 1977 that the Laricoideae were a

Piceoideae group and this version was confirmed by Hart (1987), Frankis (1988), Farjon (1990), Wang et al. (2000) and Gernandt et al. (2008), although it has not yet found application in the literature
.

Dichotomous key

The

genera included to the subfamily Laricoideae is relatively simple, since only three of them belong to it and one of these is deciduous
. Below is reported the taxonomic identification scheme in the form of a table:

1. Laricoideae (includes

Larix, Pseudotsuga and Cathaya
): 2

2. Deciduous trees............................
Larix
2. Evergreen trees: 3
3. Medium to extremely large trees; often resemble species of
Abies or Tsuga; cones pendulous, persistent scales, three-pointed bract sticking out between scales............................ Pseudotsuga
3.
Cathaya argyrophylla

Revisions and research

According to the latest research still in progress,

classification
waiting for further developments.

For other authors, finally, the

pines complex.[11]

See also

References

  1. ^ a b c d e Earle 2018.
  2. ^ "Douglas-fir: Tallest Tree in The World?". Vancouver Island Big Trees. 6 July 2011. Retrieved 2020-02-13.
  3. ^ "Subfamily Laricoideae (Rendle) Pilger & Melchior". BioLib. Retrieved 2013-05-19.
  4. ^ Farjon, A. (1990). Pinaceae: drawings and descriptions of the genera Abies, Cedrus, Pseudolarix, Keteleeria, Nothotsuga, Tsuga, Cathaya, Pseudotsuga, Larix and Picea. Königstein: Koeltz Scientific Books.
  5. ^ a b c d "Pinaceae", Missouri Botanical Garden Taxonomy, Missouri Botanical Garden, retrieved 2018-01-05
  6. PMID 19477895
    .
  7. PMID 20651328
    .
  8. ISBN 978-0-691-14580-8
    .
  9. PMID 10779538
    .
  10. S2CID 52110440
    .
  11. ^
    ISBN 978-88-299-1824-9
    .

Bibliography

External links
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