Podocarpaceae is a large family of mainly Southern Hemisphere conifers, known in English as podocarps, comprising about 156 species of evergreen trees and shrubs.[1] It contains 19 genera if Phyllocladus is included and Manoao and Sundacarpus are recognized.

Podocarpaceae
Temporal range: Jurassic–present
Podocarpus macrophyllus foliage and mature seed cones
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnosperms
Division: Pinophyta
Class: Pinopsida
Order: Araucariales
Family: Podocarpaceae
Endl.
Genera

See text

Synonyms
  • Acmopylaceae Melikian & Bobrov 1997
  • Bracteocarpaceae Melikian & Bobrov 2000
  • Dacrycarpaceae Melikian & Bobrov 2000
  • Dacrydiaceae Bobrov & Melikian 2000
  • Falcatifoliaceae Melikian & Bobrov 2000
  • Halocarpaceae Melikian & Bobrov 2000
  • Lepidothamnaceae Melikian & Bobrov 2000
  • Microcachrydaceae Doweld & Reveal 1999
  • Microstrobaceae Doweld & Reveal 2001
  • Nageiaceae Fu 1992
  • Parasitaxaceae Melikian & Bobrov 2000
  • Pherosphaeraceae Nakai 1938
  • Phyllocladaceae Bessey 1907
  • Prumnopityaceae Melikian & Bobrov 2000
  • Saxegothaeaceae Gaussen ex Doweld & Reveal 1999

The family is a classic member of the Antarctic flora, with its main centres of diversity in Australasia, particularly New Caledonia, Tasmania, and New Zealand, and to a slightly lesser extent Malesia and South America (primarily in the Andes Mountains). Several genera extend north of the equator into Indochina and the Philippines. Podocarpus reaches as far north as southern Japan and southern China in Asia, and Mexico in the Americas, and Nageia into southern China and southern India. Two genera also occur in sub-Saharan Africa, the widespread Podocarpus and the endemic Afrocarpus.

Parasitaxus usta is unique as the only known parasitic gymnosperm. It occurs on New Caledonia, where it is parasitic on another member of the Podocarpaceae, Falcatifolium taxoides.[2]

The genus Phyllocladus is sister to the Podocarpaceae sensu stricto.[2] It is treated by some botanists in its own family, the Phyllocladaceae.[3]

Taxonomy Edit

The Podocarpaceae show great diversity, both morphologically and ecologically. Members occur mainly in the Southern Hemisphere, with most genetic variety taking place in New Caledonia, New Zealand, and Tasmania. Species diversity of Podocarpus is found mainly in South America and the Indonesian islands, the latter also being rich in Dacrydium and Dacrycarpus species.

Podocarpus (with 82 to 100 species)[1][4] and Dacrydium (with 21 species) are the largest genera. A few genera are common to New Zealand and South America, supporting the view that podocarps had an extensive distribution over southern Gondwanaland. The breaking up of Gondwanaland led to large-scale speciation of the Podocarpaceae.

Until 1970, only seven Podocarpaceae genera were recognized: Podocarpus, Dacrydium, Phyllocladus, Acmopyle, Microcachrys, Saxegothaea, and Pherosphaera. All four of the African species fell under PodocarpusP. falcatus, P. elongatus, P. henkelii, and P. latifolius. Taxonomists divided Podocarpus species into eight species groups based on leaf anatomy: Afrocarpus J.Buchholz & N.E.Gray, Dacrycarpus Endl., Eupodocarpus Endl., Microcarpus Pilg., Nageia (Gaertn.) Endl., Polypodiopsis C.E.Bertrand (non Polypodiopsis Carriére nom. rej. prop. 6), Stachycarpus Endl. and Sundacarpus J.Buchholz and N.E.Gray.

Studies of embryology, gametophyte development, female cone structure, and cytology led to the belief that the eight categories probably deserved generic status. Researchers agreed on the need to recognize "fairly natural groupings which prove to have good geographic and probably evolutionary cohesion" and took the necessary steps to raise each section to generic status.[5]

In 1990, a treatment of the Podocarpaceae recognized 17 genera, excluding Phyllocladus from the family, while recognizing Sundacarpus, but not Manoao.[4] In 1995, Manoao was segregated from Lagarostrobus, based on morphological characteristics.[6] In 2002, a molecular phylogenetic study showed Sundacarpus is embedded in Prumnopitys and the monophyly of Lagarostrobos is doubtful if Manoao is included within it.[2] More recent treatments of the family have recognized Manoao, but not Sundacarpus.[7]

Evolution Edit

Molecular evidence supports Podocarpaceae being the sister group to the Araucariaceae, and having diverged from it during the late Permian.[8] While some fossils attributed to the family have been reported from the Late Permian and Triassic, like Rissikia, these cannot be unambiguously assigned to the family. The oldest unambiguous members of the family are known from the Jurassic period, found across both hemispheres, such as Scarburgia and Harrisiocarpus from the Middle Jurassic of England, as well as unnamed species from the Middle-Late Jurassic of Patagonia. Modern genera of the family first appeared during the Early Cretaceous, with the family probably reaching an apex of diversity during the early Cenozoic.[9]

Genera Edit

Studies based on anatomical, biogeographical, morphological, and DNA evidence suggest these relationships:

Knopf 2012[10] Leslie et al. 2018[11][12]
Podocarpaceae

Saxegothaea

Halocarpus

Lepidothamnus

Lagarostrobos

Manoao

Phyllocladus

Prumnopitys

Microcachrys

Pherosphaera

Acmopyle

Dacrycarpus

Falcatifolium

Dacrydium

Retrophyllum

Nageia

Afrocarpus

Podocarpus

Phyllocladoideae
Phyllocladeae

Lepidothamnus

Phyllocladus

Prumnopityeae

Halocarpus

Parasitaxus

Lagarostrobos

Manoao

Pectinopitys

Sundacarpus

Prumnopitys

Podocarpoideae
Saxegothaeeae

Saxegothaea

Microcachrydeae

Microcachrys

Pherosphaereae

Pherosphaera

Acmopyleae

Acmopyle

Dacrydieae

Dacrycarpus

Falcatifolium

Dacrydium

Podocarpeae

Retrophyllum

Afrocarpus

Nageia

Podocarpus

List of genera Edit

References Edit

  1. ^ a b James E. Eckenwalder. 2009. Conifers of the World. Portland, Oregon: Timber Press. ISBN 978-0-88192-974-4.
  2. ^ a b c William T. Sinclair, R. R. Mill, M. F. Gardner, P. Woltz, T. Jaffré, J. Preston, M. L. Hollingsworth, A. Ponge, and M. Möller. 2002. "Evolutionary relationships of the New Caledonian heterotrophic conifer, Parasitaxis usta (Podocarpaceae), inferred from chloroplast trnL-F intron/spacer and nuclear rDNA ITS2 sequences". Plant Systematics and Evolution 233 (1–2): 79–104. doi:10.1007/s00606-002-0199-8
  3. ^ Christopher N. Page. 1990. "Phyllocladaceae" pages 317–319. In: Klaus Kubitzki (general editor); Karl U. Kramer and Peter S. Green (volume editors) The Families and Genera of Vascular Plants volume I. Berlin, Heidelberg: Springer-Verlag. ISBN 978-0-387-51794-0
  4. ^ a b Christopher N. Page. 1990. "Podocarpaceae" pages 332–346. In: Klaus Kubitzki (general editor); Karl U. Kramer and Peter S. Green (volume editors) The Families and Genera of Vascular Plants volume I. Berlin, Heidelberg: Springer-Verlag. ISBN 978-0-387-51794-0
  5. ^ Barker, N. P.; Muller, E. M.; and Mill, R. R. (2004). "A yellowwood by any other name: molecular systematics and the taxonomy of Podocarpus and the Podocarpaceae in southern Africa" Archived 2008-04-08 at the Wayback Machine. South African Journal of Science, 100: 629–632.
  6. ^ Brian P. J. Molloy. 1995. "Manoao (Podocarpaceae), a new monotypic conifer genus endemic to New Zealand". New Zealand Journal of Botany 33 (2): 183–201.
  7. ^ Aljos Farjon. 2008. A Natural History of Conifers. Portland, Oregon: Timber Press. ISBN 978-0-88192-869-3
  8. ^ 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 (July 19, 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.
  9. ^ Andruchow-Colombo, Ana; Escapa, Ignacio H; Aagesen, Lone; Matsunaga, Kelly K S (2023-08-04). "In search of lost time: tracing the fossil diversity of Podocarpaceae through the ages". Botanical Journal of the Linnean Society. doi:10.1093/botlinnean/boad027. ISSN 0024-4074.
  10. ^ Knopf; Schulze; Little; Stützel; Stevenson (2012). "Relationships within Podocarpaceae based on DNA sequence, anatomical, morphological, and biogeographical data". Cladistics. 28 (3): 271–299. doi:10.1111/j.1096-0031.2011.00381.x. PMID 34872191. S2CID 86581015.
  11. ^ Leslie, Andrew B.; Beaulieu, Jeremy; Holman, Garth; Campbell, Christopher S.; Mei, Wenbin; Raubeson, Linda R.; Mathews, Sarah; et al. (2018). "An overview of extant conifer evolution from the perspective of the fossil record". American Journal of Botany. 105 (9): 1531–1544. doi:10.1002/ajb2.1143. PMID 30157290.
  12. ^ Leslie, Andrew B.; et al. (2018). "ajb21143-sup-0004-AppendixS4" (PDF). American Journal of Botany. 105 (9): 1531–1544. doi:10.1002/ajb2.1143. PMID 30157290. S2CID 52120430.

Further reading Edit

  • Christopher J. Quinn and Robert A. Price. 2003. "Phylogeny of the Southern Hemisphere Conifers". Proceedings of the Fourth International Conifer Conference: 129–136. DOI: 10.17660/ActaHortic.2003.615.10

External links Edit