Casuarina

Short description: Genus of trees

Casuarina

Casuarina equisetifolia, showing red female flowers and mature fruits
Scientific classification
Kingdom:  | Plantae
Clade:  | Tracheophytes
Clade:  | Angiosperms
Clade:  | Eudicots
Clade:  | Rosids
Order:  | Fagales
Family:  | Casuarinaceae
Genus:  | Casuarina
L.[1]
Type species
Casuarina equisetifolia[2]

Species

See text

Female cones of C. equisetifolia

Casuarina, also known as she-oak, Australian pine[3][4][5] and native pine,[6] is a genus of flowering plants in the family Casuarinaceae, and is native to Australia, the Indian subcontinent, Southeast Asia, islands of the western Pacific Ocean, and eastern Africa.

Plants in the genus Casuarina are monoecious or dioecious trees with green, pendulous, photosynthetic branchlets, the leaves reduced to small scales arranged in whorls around the branchlets, the male and female flowers arranged in separate spikes, the fruit a cone containing grey or yellowish-brown winged seeds.

## Contents

* 1 Description
* 2 Ecology
* 3 Taxonomy
* 3.1 Species List
* 3.2 Invasive species
* 4 References
* 5 External links

## Description

Plants in the genus Casuarina are dioecious trees (apart from C. equisetifolia that is monoecious), with fissured or scaly greyish-brown to black bark. They have soft, pendulous, green, photosynthetic branchlets, the leaves reduced to scale-like leaves arranged in whorls of 5 to 20 around the branchlets. The branchlets are segmented at each whorl with deep furrows that conceal the stomates. Male flowers are arranged along branchlets in spikes with persistent bracteoles, female flowers in spikes on short side-branches (effectively "peduncles") that differ in appearance from vegetative branchlets. After fertilisation, the female spikes develop into "cones" with thin, woody bracteoles that extend well beyond the cone body. The cones enclose grey or yellowish-brown winged seed known as samaras.[7][8][9][10][11][12]

## Ecology

Casuarina are attacked by a range of herbivorous insects.

* Hymenoptera: The wasps Bootanelleus orientalis and another Bootanelleus species (Torymidae) feed on seeds.[13] Selitrichodes casuarinae and S. utilis (Eulophidae) induce galls.[14]
* Lepidoptera: Most lepidopteran herbivores are in the family Oecophoridae. Zauclophora pelodes, Araeostoma aenicta and Lichenaula sp. feed on leaves, and the latter two are also leaf tiers. Cryptophasa irrorata bores in branches and stems.[13] Outside of Oecophoridae, there are fruit- and leaf-feeders in families Carposinidae and Gelechiidae.[4]
* Curculionidae: A weevil in genus Haplonyx feeds on cones. The genera Misophrice and Apion have also been recorded on Casuarina, but the nature of their associations is unknown.[13]
* Hemiptera: Casuarinicola jumping plant lice (Triozidae) feed on sap of Casuarina.[15] Another hemipteran associated with this genus is the felt scale Choneochiton casuarinae (Eriococcidae).[16]
* Diptera: The gall midge Ophelmodiplosis clavata (Cecidomyiidae) induces galls on branchlet tips.[17]

## Taxonomy

The genus Casuarina was first formally described in 1759 by Carl Linnaeus in Amoenitates Academicae and the first species he described (the type species) was Casuarina equisetifolia.[2][18] The generic name is derived from the Malay word for the cassowary, kasuari, alluding to the similarities between the bird's feathers and the plant's foliage.[19]

### Species List

The following is a list of Casuarina species accepted by Plants of the World Online as of April 2023:[20]

* Casuarina collina Poiss. ex Pancher & Sebert (New Caledonia)
* Casuarina cristata Miq. – belah, muurrgu (Qld., N.S.W.).
* Casuarina cunninghamiana Miq. – river oak, river sheoak, creek oak (Qld., N.S.W., A.C.T., N.T.)
* Casuarina equisetifolia L. – coastal she-oak, horsetail she-oak (South Asia, Southeast Asia, Australia)
* Casuarina glauca Sieber ex Spreng. – swamp she-oak, swamp buloke, marsh sheoak (Qld., N.S.W.)
* Casuarina grandis L.A.S.Johnson (New Guinea)
* Casuarina junghuhniana Miq. (Indonesia)
* Casuarina obesa Miq. – swamp she-oak, swamp oak, western swamp oak (W.A., S.A., Vic., N.S.W.)
* Casuarina oligodon L.A.S.Johnson (New Guinea)
* Casuarina orophila L.A.S.Johnson (New Guinea)
* Casuarina pauper F.Muell. ex L.A.S.Johnson – black oak, belah, kariku (W.A., S.A., Qld., N.S.W., Vic.)
* Casuarina potamophila Schltr. (New Caledonia)
* Casuarina tenella Schltr. (New Caledonia)
* Casuarina teres Schltr. (New Caledonia)

In 1982, Lawrence Johnson raised the genera Allocasuarina and Gymnostoma in the Journal of the Adelaide Botanic Gardens, and transferred some species previously included in Casuarina to the new genera. The species of Allocasuarina previously in Casuarina are: A. acuaria, A. acutivalvis, A. campestris, A. corniculata, A. decaisneana, A. decussata, A. dielsiana, A. distyla, A. drummondiana, A. drummondiana, A. fraseriana, A. grevilleoides, A. helmsii, A. huegeliana, A. humilis, A. inophloia, A. lehmanniana subsp. lehmanniana, A. littoralis, A. luehmannii, A. microstachya, A. monilifera, A. muelleriana, A. nana, A. paludosa, A. paradoxa, A. pinaster, A. pusilla, A. ramosissima, A. rigida, A. robusta, A. striata, A. tessellata, A. thuyoides, A. torulosa, A. trichodon and A. verticillata. The species of Gymnostoma previously included in Casuarina are G. chamaecyparis, G. deplancheanum, G. intermedium, G. leucodon, G. nobile, G. nodiflorum, G. papuanum, G. poissonianum, G. rumphianum and G. sumatranum and G. webbianum.[21]

### Invasive species

Casuarina on Gold Rock Beach, Grand Bahama

C. cunninghamiana, C. glauca and C. equisetifolia have become naturalized in many countries, including Argentina , Bermuda, Cayman Islands, Cuba, China, Egypt, Israel, Iraq, Mauritius, Kenya, Mexico, Brazil , South Africa , the Bahamas,[22] and Uruguay. They are considered an invasive species[23][24] in the United States, especially in southern Florida[25] where they have nearly quadrupled in number between 1993 and 2005 and are called the Australian pine.[3] C. equisetifolia is widespread in the Hawaiian Islands where it grows both on the seashore in dry, salty, calcareous soils and up in the mountains in high rainfall areas on volcanic soils.[citation needed] It is also an invasive plant in Bermuda, where it was introduced to replace the Juniperus bermudiana windbreaks killed by a scale insect in the 1940s.[26]

## References

1. ↑ "Casuarina". Plants of the World Online. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:924821-1.
2. ↑ 2.0 2.1 "Casuarina". APNI. https://id.biodiversity.org.au/instance/apni/457715.
3. ↑ 3.0 3.1 IFAS: SRFer Mapserver
4. ↑ 4.0 4.1 "Evaluating Biological Control Agents of Australian Pine : USDA ARS". https://www.ars.usda.gov/office-of-international-research-engagement-and-cooperation/overseas-biological-control-obcl-highlights/evaluating-biological-control-agents-of-australian-pine/.
5. ↑ "FIELD GUIDE TO IDENTIFY THE COMMON CASUARINA (AUSTRALIAN PINE) SPECIES IN FLORIDA". Institute of Food and Agricultural Sciences. University of Florida. https://edis.ifas.ufl.edu/publication/HS394.
6. ↑ "Casuarina glauca prostrate forms". Australian National Botanic Gardens. Australian National Biodiversity Research. https://www.anbg.gov.au/gnp/interns-2005/casuarina-glauca.html.
7. ↑ Wilson, Karen L.; Johnson, Lawrence A.S.. "Casuarina". Australian Biological Resources Study, Department of Climate Change, the Environment and Water: Canberra. https://profiles.ala.org.au/opus/foa/profile/Casuarina.
8. ↑ "Casuarina". FloraBase. Western Australian Government Department of Parks and Wildlife. https://florabase.dpaw.wa.gov.au/browse/profile/21301.
9. ↑ Wilson, Karen L.; Johnson, Lawrence A.S.. "Genus Casuarina". Royal Botanic Garden Sydney. https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&showsyn=&dist=&constat=&lvl=gn&name=Casuarina.
10. ↑ Entwisle, Timothy J.; Walsh, Neville. "Casuarina". Royal Botanic Gardens Victoria. https://vicflora.rbg.vic.gov.au/flora/taxon/b2325905-a7e5-4005-8bcb-9cbde29fd00c.
11. ↑ "Casuarina". Northern Territory Government. http://eflora.nt.gov.au/factsheetGenus?id=1086.
12. ↑ Huxley, A., ed (1992). New RHS Dictionary of Gardening. Macmillan Publishers. ISBN 0-333-47494-5.
13. ↑ 13.0 13.1 13.2 "Ecology and Management of Sheoak (Casuarina spp.), an Invader of Coastal Florida, U.S.A.". Journal of Coastal Research 27 (3): 485. 2011-05-01. doi:10.2112/JCOASTRES-D-09-00110.1. ISSN 0749-0208. https://www.ars.usda.gov/ARSUserFiles/33272/Gaskin_243079.pdf.
14. ↑ Fisher, Nicole; Moore, Aubrey; Brown, Bradley; Purcell, Matthew; Taylor, Gary S.; Salle, John La (2014-04-23). "Two new species of Selitrichodes (Hymenoptera: Eulophidae: Tetrastichinae) inducing galls on Casuarina (Casuarinaceae)". Zootaxa 3790 (4): 534–542. doi:10.11646/zootaxa.3790.4.2. ISSN 1175-5334. PMID 24869885. http://biotaxa.org/Zootaxa/article/view/zootaxa.3790.4.2.
15. ↑ Taylor, Gary S.; Austin, Andy D.; Jennings, John T.; Purcell, Matthew F.; Wheeler, Gregory S. (2010-09-02). "Casuarinicola, a new genus of jumping plant lice (Hemiptera: Triozidae) from Casuarina (Casuarinaceae)". Zootaxa 2601 (1): 1. doi:10.11646/zootaxa.2601.1.1. ISSN 1175-5334. https://biotaxa.org/Zootaxa/article/view/zootaxa.2601.1.1.
16. ↑ Hodgson, Chris; Mille, Christian; CazèRes, Sylvie (2014-03-05). "A new genus and species of felt scale (Hemiptera: Coccoidea: Eriococcidae) from New Caledonia". Zootaxa 3774 (2): 152–164. doi:10.11646/zootaxa.3774.2.3. ISSN 1175-5334. PMID 24871412. http://biotaxa.org/Zootaxa/article/view/zootaxa.3774.2.3.
17. ↑ Kolesik, Peter; Brown, Bradley T; Purcell, Matthew F; Taylor, Gary S (2012). "A new genus and species of gall midge (Diptera: Cecidomyiidae) from Casuarina trees in Australia: New gall midge from Casuarina" (in en). Australian Journal of Entomology 51 (4): 223–228. doi:10.1111/j.1440-6055.2012.00860.x. https://onlinelibrary.wiley.com/doi/10.1111/j.1440-6055.2012.00860.x.
18. ↑ Linnaeus, Carl (1759). Amoenitates academicae, seu, Dissertationes variae physicae, medicae, botanicae. p. 143. https://www.biodiversitylibrary.org/item/15496#page/146/mode/1up. Retrieved 21 April 2023.
19. ↑ Quattrocchi, Umberto (2000). CRC World Dictionary of Plant Names. I A-C. CRC Press. p. 456. ISBN 978-0-8493-2675-2. https://books.google.com/books?id=esMPU5DHEGgC.
20. ↑ Govaerts R. "Casuarina L.". Board of Trustees of the Royal Botanic Gardens, Kew. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:924821-1#children.
21. ↑ Johnson, Lawrence A. (1982). "Note on Casuarinaceae II". Journal of the Adelaide Botanic Gardens 6 (1): 73–86. https://www.biodiversitylibrary.org/page/61978679#page/85/mode/1up. Retrieved 21 April 2023.
22. ↑ BEST Commission (March 2003). "The National Invasive Species Strategy for The Bahamas". Nassau, The Bahamas: BEST. http://www.best.bs/Documents/bahamas_nationalstrategy.doc.
23. ↑ USFS FEIS: Casuarina
24. ↑ USDA Forest service: Casuarina
25. ↑ "GISD". http://www.iucngisd.org/gisd/species.php?sc=365.
26. ↑ "Casuarina (Casuarina equisetifolia)". Department of Conservation. Government of Bermuda. http://www.conservation.bm/casuarina/.

## External links

* "Casuarina L.: Queensland Oak". Atlas of Living Australia. https://bie.ala.org.au/species/https://id.biodiversity.org.au/taxon/apni/51270402.

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