Corymbia ptychocarpa

Corymbia ptychocarpa, commonly known as the swamp bloodwood or spring bloodwood,[2] is a species of tree that is endemic to northwestern Australia. It has rough bark on the trunk and branches, broadly lance-shaped adult leaves, flower buds in groups of seven, creamy yellow, pink or red flowers, and barrel-shaped, ribbed fruit.

Swamp bloodwood
Corymbia ptychocarpa.jpg
Corymbia ptychocarpa at March Fly Glen, King Leopold Ranges
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Corymbia
Species:
C. ptychocarpa
Binomial name
Corymbia ptychocarpa
Synonyms[1]

Eucalyptus ptychocarpa F.Muell.

flower buds and flowers
fruit

DescriptionEdit

Corymbia ptychocarpa is a tree that typically grows to a height of 4.5 to 20 metres (15 to 66 ft) and has thick, rough, tessellated, brownish bark on the trunk and branches. It has the form of a crooked tree that tends to flop when young and often has drooping branches. Young plants and coppice regrowth have oblong to round or elliptical, later egg-shaped leaves that are 60–300 mm (2.4–11.8 in) long, 70–130 mm (2.8–5.1 in) wide and petiolate. Adult leaves are leathery, paler on the lower surface, broadly lance-shaped, 110–460 mm (4.3–18.1 in) long and 27–130 mm (1.1–5.1 in) wide, tapering to a petiole 15–40 mm (0.59–1.57 in) long. The midrib is pale yellow in contrast to the green lamina and the lateral veins are parallel to each other. The flowers are borne on the ends of branchlets on a branched peduncle 10–60 mm (0.39–2.36 in) long, each branch of the peduncle with seven buds on pedicels 10–34 mm (0.39–1.34 in) long. Mature buds are oval to pear-shaped, 13–24 mm (0.51–0.94 in) long and 11–18 mm (0.43–0.71 in) wide with a rounded to blunt-conical operculum. Flowering occurs from February to May and the flowers are creamy yellow, pink or red. The fruit is a woody, barrel-shaped capsule 32–55 mm (1.3–2.2 in) long and 26–45 mm (1.0–1.8 in) wide with about eight sharp ribs on the sides and the valves enclosed in the fruit.[2][3][4][5][6][7]

Taxonomy and namingEdit

Swamp bloodwood was first formally described in 1859 by Ferdinand von Mueller who gave it the name Eucalyptus ptychocarpa and published the description in the Journal of the Proceedings of the Linnean Society, Botany.[8][9] In 1995 Ken Hill and Lawrence Alexander Sidney Johnson changed the name to Corymbia ptychocarpa.[5][10]

In the same paper, Hill and Johnson described two subspecies and the names are accepted by the Australian Plant Census:

  • Corymbia ptychocarpa subsp. aptycha K.D.Hill & L.A.S.Johnson[11] that differs from the autonym in having the flower buds and fruit not, or only indistinctly ribbed.[5]
  • Corymbia ptychocarpa (F.Muell.) K.D.Hill & L.A.S.Johnson subsp. ptychocarpa.[12]

Distribution and habitatEdit

Corymbia ptychocarpa is found from the Kimberley region of Western Australia and through the Top End of the Northern Territory to near Doomadgee in far north-western Queensland. It grows in sandy soils and alluvium along watercourses and near springs. In the Northern Territory it occurs on the Arnhem Plateau, Daly Basin, Ord Victoria Plain, Pine Creek and the Victoria Bonaparte biogeographic regions.[2][3][7][13]

Subspecies aptycha is restricted to the Top End between the Cobourg Peninsula, Yirrkala amd El Sharana in Arnhem Land.[14]

It is also grown as a street tree in parts of Queensland such as Cairns and Townsville.[4]

See alsoEdit

ReferencesEdit

  1. ^ a b "Corymbia ptychocarpa". Australian Plant Census. Retrieved 24 February 2020.
  2. ^ a b c "Corymbia ptychocarpa". Euclid: Centre for Australian National Biodiversity Research. Retrieved 24 February 2020.
  3. ^ a b "Corymbia ptychocarpa". FloraBase. Western Australian Government Department of Parks and Wildlife.
  4. ^ a b "Corymbia ptychocarpa". James Cook University. Retrieved 9 October 2016.
  5. ^ a b c Hill, Kenneth D.; Johnson, Lawrence A.S. (13 December 1995). "Systematic studies in the eucalypts. 7. A revision of the bloodwoods, genus Corymbia (Myrtaceae)". Telopea. 6 (2–3): 250–252. doi:10.7751/telopea19953017.
  6. ^ Chippendale, George M. "Eucalyptus ptychocarpa". Australian Biological Resources Study, Department of Agriculture, Water and the Environment, Canberra. Retrieved 24 February 2020.
  7. ^ a b "Corymbia ptychocarpa (F.Muell.) K.D.Hill & L.A.S.Johnson". NT Flora. Northern Territory Government. 2013. Retrieved 9 October 2016.
  8. ^ "Eucalyptus ptychocarpa". APNI. Retrieved 24 February 2020.
  9. ^ von Mueller, Ferdinand (1859). "Monograph of the Eucalypti of Tropical Australia". Journal of the Proceedings of the Linnean Society, Botany. 3: 90–91. Retrieved 24 February 2020.
  10. ^ "Corymbia ptychocarpa". APNI. Retrieved 24 February 2020.
  11. ^ "Corymbia ptychocarpa subsp. aptycha". Australian Plant Census. Retrieved 24 February 2020.
  12. ^ "Corymbia ptychocarpa subsp. ptychocarpa". Australian Plant Census. Retrieved 24 February 2020.
  13. ^ "Corymbia ptychocarpa subsp. ptychocarpa". FloraBase. Western Australian Government Department of Parks and Wildlife.
  14. ^ "Corymbia ptychocarpa subsp. aptycha". Euclid: Centre for Australian National Biodiversity Research. Retrieved 24 February 2020.