Cephalotaxus

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Cephalotaxus
Temporal range: Eocene–Recent
Cephalotaxus harringtonia BotGardBln1105WithSeeds.JPG
Cephalotaxus harringtonii
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnosperms
Division: Pinophyta
Class: Pinopsida
Order: Cupressales
Family: Taxaceae
Genus: Cephalotaxus
Siebold & Zucc. ex Endl.
Type species
Cephalotaxus pedunculata
Species

Cephalotaxus, commonly called plum yew or cowtail pine, is a genus of conifers comprising 11 species, either considered the only member of the family Cephalotaxaceae, or in the Taxaceae when that family is considered in a broad sense. [1] [2] The genus is endemic to eastern Asia, though fossil evidence shows it had a wider Northern Hemisphere distribution in the past. [1] The species are evergreen shrubs and small trees reaching 1.0–10 metres (3–33 ft) (rarely to 20 metres (66 ft)) tall.

Contents

Description

The leaves are spirally arranged on the shoots, but twisted at the base to lie in two flat ranks (except on erect leading shoots); they are linear, 4–12 centimetres (1+124+34 in) long and 3–4 millimetres (18532 in) broad, soft in texture, with a blunt tip; this helps distinguish them from the related genus Torreya , which has spine-tipped leaves. [2]

The species can be either monoecious or dioecious; when monoecious, the male and female cones are often on different branches. The male (pollen) cones are 5–8 millimetres (1364516 in) long, grouped in lines along the underside of a shoot. The female (seed) cones are single or grouped two to 15 together on short stems; minute at first, they mature in about 18 months to a drupe-like structure with the single large nut-like seed 1.5–4 centimetres (581+58 in) long surrounded by a fleshy covering, green to purple at full maturity. Natural dispersal is thought to be aided by squirrels which bury the seeds for a winter food source; any seeds left uneaten are then able to germinate. [2]

Phytochemistry

Cephalotaxus species produce cephalotaxine, an alkaloid. Parry et al 1980 provides evidence that cephalotaxine is a phenylethylisoquinoline. However, they also find this genus to be unable to incorporate cinnamic acid into cephalotaxine, and incorporation of cinnamic acid is usually a step in phenylethylisoquinoline syntheses, throwing the phenylethylisoquinoline theory in to question. [3]

Phylogeny

Molecular studies place Cephalotaxus as the most basal member of the Taxaceae, having a very ancient divergence from them during the late Triassic. [4] Historically, it was placed as the only member of the family Cephalotaxaceae, due to strong morphological differences from other members of Taxaceae, [5] but major authorities consider the family synonymous with Taxaceae. [6] [7]

Extant species

The taxonomy of Cephalotaxus is difficult, because the species have been defined using characteristics that intergrade with each other, such as the length and shape of needles, bark, and stomatal band color. Cephalotaxus species have often been separated geographically rather than morphologically. [8]

Phylogeny of Cephalotaxus [9] [10]
Cephalotaxus

C. oliveri Masters

C. harringtonii (Knight ex Forbes) Koch

C. hainanensis Li

C. mannii Hooker

C. sinensis (Rehder & Wilson) Li

C. drupacea Siebold & Zuccarini

C. nana Nakai

C. griffithii Hooker

C. lanceolata Feng ex Cheng, Fu & Cheng

C. fortunei Hooker

Fossil record

Cephalotaxus bonseri
Latah Formation, Miocene Cephalotaxus bonseri holotype USNM P36887 img3.jpg
Cephalotaxus bonseri
Latah Formation, Miocene

The oldest fossils of Cephalotaxus are known from the Eocene of Heilongjiang in northeast China and the Messel Pit of Germany. The youngest fossils of Cephalotaxus in Europe date to the Pliocene, and remains are also known from the Miocene of western North America. [11] [12]

Related Research Articles

<span class="mw-page-title-main">Taxaceae</span> Family of conifers

Taxaceae, commonly called the yew family, is a coniferous family which includes six extant and two extinct genera, and about 30 species of plants, or in older interpretations three genera and 7 to 12 species.

<i>Chamaecyparis</i> Genus of conifers

Chamaecyparis, common names cypress or false cypress, is a genus of conifers in the cypress family Cupressaceae, native to eastern Asia and to the western and eastern margins of the United States. The name is derived from the Greek khamai (χαμαί), meaning "on the earth", and kuparissos (κυπάρισσος) for "cypress".

<i>Sciadopitys verticillata</i> Species of conifer

Sciadopitys verticillata, the kōyamaki or Japanese umbrella-pine, is a unique conifer endemic to Japan. It is the sole living member of the family Sciadopityaceae and genus Sciadopitys, a living fossil with no close relatives. The oldest fossils of Sciadopitys are from the Late Cretaceous of Japan, and the genus was widespread in Laurasia during most of the Cenozoic, especially in Europe until the Pliocene.

<i>Phyllocladus</i> Genus of plants

Phyllocladus, the celery pines, is a small genus of conifers, now usually placed in the family Podocarpaceae.Species occur mainly in New Zealand, Tasmania, and Malesia in the Southern Hemisphere, though P. hypophyllus ranges into the Philippines, a short way north of the equator.

<i>Calocedrus</i> Genus of conifer trees

Calocedrus, the incense cedar, is a genus of coniferous trees in the cypress family Cupressaceae first described as a genus in 1873. Three species are native to eastern Asia and one to western North America.

<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

Afrocarpus is a genus of conifers of the family Podocarpaceae. Two to six species are recognized. They are evergreen trees native to Africa. Afrocarpus was designated a genus in 1989, when several species formerly classified in Podocarpus and Nageia were reclassified.

<i>Prumnopitys</i> Genus of conifers

Prumnopitys is a genus of conifers belonging to the family Podocarpaceae. The nine recognized species of Prumnopitys are densely branched, dioecious evergreen trees up to 40 metres in height.

<i>Dacrycarpus</i> Genus of conifers

Dacrycarpus is a genus of conifers belonging to the family Podocarpaceae. The genus includes nine species of dioecious evergreen trees and shrubs to 55–60 metres (180–197 ft) in height.

<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>Callitris</i> Genus of conifers

Callitris is a genus of coniferous trees in the Cupressaceae. There are 16 recognized species in the genus, of which 13 are native to Australia and the other three native to New Caledonia. Traditionally, the most widely used common name is cypress-pine, a name shared by some species of the closely related genus Actinostrobus.

<i>Keteleeria</i> Genus of conifers

Keteleeria is a genus of three species of coniferous trees in the family Pinaceae first described as a genus in 1866.

<i>Torreya</i> Genus of conifers

Torreya is a genus of conifers comprising six or seven species placed in the family Taxaceae, though sometimes formerly placed in Cephalotaxaceae. Four species are native to eastern Asia; the other two are native to North America. They are small to medium-sized evergreen trees reaching 5–20 m, rarely 25 m, tall. Common names include nutmeg yew.

<i>Athrotaxis</i> Genus of conifers

Athrotaxis is a genus of two to three species of conifers in the cypress family, Cupressaceae. The genus is endemic to western Tasmania, where they grow in high-elevation temperate rainforests.

<i>Retrophyllum</i> Genus of conifers

Retrophyllum is a genus of conifers in the family Podocarpaceae. It contains five generally recognized extant species with a disjunct distribution in the Southern Hemisphere, found in Papuasia and also in South America. Retrophyllum are evergreen trees typically occurring in tropical rainforests and cloud forests.

<i>Amentotaxus</i> Genus of conifers

Amentotaxus is a genus of conifers (catkin-yews) comprising five species, treated in either the Cephalotaxaceae, or in the Taxaceae when that family is considered in a broad sense. The genus is endemic to subtropical Southeast Asia, from Taiwan west across southern China to Assam in the eastern Himalaya, and south to Vietnam. The species are evergreen shrubs and small trees reaching 2–15 m tall.

<i>Lepidozamia</i> Genus of cycads in the family Zamiaceae

Lepidozamia is a genus of two species of cycad, both endemic to Australia. They are native to rainforest climates in eastern Queensland and eastern New South Wales. They have a diploid chromosome number of 2n = 18.

<i>Ceratozamia</i> Genus of cycads

Ceratozamia is a genus of New World cycads in the family Zamiaceae. The genus contains 27 known currently living species and one or two fossil species. Most species are endemic to mountainous areas of Mexico, while few species extend into the mountains of Guatemala, Honduras and Belize. The genus name comes from the Greek ceras, meaning horn, which refers to the paired, spreading horny projections on the male and female sporophylls of all species.

<i>Hesperocyparis</i> Genus of conifers

Hesperocyparis is a genus of trees in the family Cupressaceae, containing North American species otherwise assigned to the genus Cupressus. They are found throughout western North America. Only a few species have wide ranges, with most being restricted-range endemics.

It is suggested a late Pliocene age (Reuverian) for this flora. Palynofloras from drill cores in the surroundings of Frankfurt am Main and Hanau also suggests a late Pliocene age. The Pliocene flora of Frankfurt am Main described by Karl Mädler during the first half of the twentieth century is a key flora for the European Pliocene.

References

  1. 1 2 Tripp, Kim E. (1995). "Cephalotaxus: the plum yews". Arnoldia. 55 (1): 25–39.
  2. 1 2 3 Christopher J. Earle (2011). "Cephalotaxus". The Gymnosperm Database. Archived from the original on 30 March 2012. Retrieved 31 March 2012.
  3. Abdelkafi, Hajer; Nay, Bastien (2012-08-01). "Natural products from Cephalotaxus sp.: chemical diversity and synthetic aspects". Natural Product Reports . Royal Society of Chemistry (RSC). 29 (8): 845–869. doi:10.1039/C2NP20037F. ISSN   1460-4752. PMID   22714632.
  4. Stull, Gregory W.; Qu, Xiao-Jian; Parins-Fukuchi, Caroline; Yang, Ying-Ying; Yang, Jun-Bo; Yang, Zhi-Yun; Hu, Yi; Ma, Hong; Soltis, Pamela S.; Soltis, Douglas E.; Li, De-Zhu (August 2021). "Gene duplications and phylogenomic conflict underlie major pulses of phenotypic evolution in gymnosperms". Nature Plants. 7 (8): 1015–1025. doi:10.1038/s41477-021-00964-4. ISSN   2055-0278. PMID   34282286. S2CID   236141481.
  5. Ji, Yunheng; Liu, Changkun; Landis, Jacob B; Deng, Min; Chen, Jiahui (2021-04-17). "Plastome phylogenomics of Cephalotaxus (Cephalotaxaceae) and allied genera". Annals of Botany. 127 (5): 697–708. doi:10.1093/aob/mcaa201. ISSN   0305-7364. PMC   8052924 . PMID   33252661.
  6. "Cephalotaxus Siebold & Zucc. ex Endl. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2023-03-21.
  7. "Gymnosperms - The Gymnosperm Database". www.conifers.org. Retrieved 2023-03-21.
  8. Lang, XUE-Dong; Su, Jian-Rong; Lu, SHU-Gang; Zhang, ZHI-JUN (2013). "A taxonomic revision of the genus Cephalotaxus (Taxaceae)". Phytotaxa. 84. doi: 10.11646/phytotaxa.84.1.1 .
  9. Stull, Gregory W.; Qu, Xiao-Jian; Parins-Fukuchi, Caroline; Yang, Ying-Ying; Yang, Jun-Bo; Yang, Zhi-Yun; Hu, Yi; Ma, Hong; Soltis, Pamela S.; Soltis, Douglas E.; Li, De-Zhu; Smith, Stephen A.; Yi, Ting-Shuang; et al. (2021). "Gene duplications and phylogenomic conflict underlie major pulses of phenotypic evolution in gymnosperms". Nature Plants. 7 (8): 1015–1025. bioRxiv   10.1101/2021.03.13.435279 . doi:10.1038/s41477-021-00964-4. PMID   34282286. S2CID   232282918.
  10. Stull, Gregory W.; et al. (2021). "main.dated.supermatrix.tree.T9.tre". Figshare. doi:10.6084/m9.figshare.14547354.v1.{{cite journal}}: Cite journal requires |journal= (help)
  11. Manchester, Steven R.; Chen, Zhi-Duan; Lu, An-Ming; Uemura, Kazuhiko (January 2009). "Eastern Asian endemic seed plant genera and their paleogeographic history throughout the Northern Hemisphere". Journal of Systematics and Evolution. 47 (1): 1–42. doi:10.1111/j.1759-6831.2009.00001.x.
  12. "Cephalotaxus". The International Fossil Plant Names Index. Retrieved October 1, 2023.