Agastachys

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White waratah
Agastachys odorata habit (BG SA) 6B69.JPG
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Subfamily: Symphionematoideae
Genus: Agastachys
R.Br.
Species:
A. odorata
Binomial name
Agastachys odorata

Agastachys odorata, commonly known as the white waratah or fragrant candlebush, is the sole member of the genus Agastachys in the protea family. It is an evergreen shrub to small tree and is endemic to the heaths and button grass sedgelands of western Tasmania. [2]

Contents

Botanical history

The derivation of the name is descriptive of the features of the species, which is usefully when learning to identify the beautiful species that is Agastachys odorata. In Greek Agastachys refers to the abundant spikes (the flower spikes) [3] and odorata in Latin refers to the pungent odour the flowers produce. [3]

Scottish botanist Robert Brown described Agastachys odorata in 1810. [1] The Agastachys genus only contains the single species. [2] A. odorata has been grouped formally with the Australian genera, Symphionema and New Caledonian genera Beauprea and Beaupreopsis in the subtribe Cenarrheninae. [4] However, Peter H. Weston and Nigel Barker reviewed the suprageneric relationships of the Proteaceae in 2006, using molecular and morphological data. In this scheme Agastachys and Symphionema are sister taxa in a clade which diverged early from the main lineage, and they are classified in their own subfamily Symphionematoideae. [5]

Diagnostic features

Agastachys odorata is an erect, evergreen shrub that is endemic to Tasmania. [6] [7] [8] A. odorata can be variable in shape, [7] though mature individuals are commonly found between 1–3 metres in height and 0.5- 1 meter in width. [7] [9] A. odorata displays many of the diagnostic characteristics of the Proteaceae family it belongs to. The primary protea features A. odorata exhibit's are leathery alternate leaves [3] and irregular woody floral structures [8] [7] (see figure 1 and figure 2 below).

The leaves have entire margins with rounded tips. [7] [8] They are bright green in appearance with an almost leathery thick texture. The leaf looks like a football field stretched from one end, being classified as narrow-oblong to oblanceolate. [7] [8] [3] The leaves lack hairs [6] (see figure 1 below).

The inflorescence flower spikes are the most obvious feature to distinguish A. odorata from other species by (see figure 2 below). The peak flowering times are during the early Australian summer months of December and January. [7] [10] Simply put the flower spikes look like fluffy white-to-creamy yellow candles, appropriate as one of the common names for A. odorata is fragrant candlebush. The flowers also resemble an erect, lighter coloured version of Tasmanian waratah (Telopea truncate), hence its other common name of white waratah. Masses of white-to-creamy yellow flowers are produced in erect flower spikes. [6] [8] The flower spikes are clustered on the ends of branches. [3] [7] The spikes range in height from 8 to 12 cm, hence can be noticed from a distance as the flower spikes pop above the canopy of the shrub. [6] [7] [3] The flowers produce a floral odour which some describe as pleasant [3] (see figure 2 below).

Flowering is followed by the production of an inconspicuous woody winged nut. [7] [3] [8] The morphology of the relatively large wings on the nut assist in seed dispersal by wind (anemochory). The nut is often a brown-ish colour. [3]

Distribution and habitat

Agastachys odorata is endemic to Tasmania, Australia. [6] [7] [8] It grows in highest abundances in the western and southern regions of Tasmania (see figure 3 below [11] ). [6] [8] [9] A current distribution of A. odorata can be found on the Atlas of living Australia website (Agastachys odorata interactive distribution map). A. odorata can be found in a variety of 'wet' vegetation types across Tasmania. Most often in heath, scrub, wet sclerophyll/eucalypt forest, temperate rainforest and occasionally in the alpine regions. [10] [6] A. odorata prefers to grow in areas of high rainfall, hence its limited distribution toward to drier eastern parts of Tasmania. [7] [8]

A. odorata is commonly found on nutrient poor soils. [6] [9] The proteoid roots produced by A. odorata, a feature of the proteaceae family, [12] increase the nutrient absorption of the plant, [12] helping the species to thrive in harsh nutrient conditions. [7] [9] The proteoid roots facilitate increased nutrient absorption as the dense clusters of roots increase the surface area for nutrient uptake to occur across [12] [7]

A great place to see A. odorata is in the Southwest and Franklin-Gordan Wild Rivers National Parks, Tasmania. [9] Here you will see such amazing specimens such as figure 4(see below) from Frenchmans Cap of A. odorata.

Threats and conservation issues

Currently, Agastachys odorata is not listed as a threatened species on either the Tasmanian Threatened Species List or the EPBC Act List of Threatened Flora. However, as A. odorata is an underrepresented species in ecological and scientific works, the effects of climate and land-use changes occurring Tasmania, Australia, does not ensure that its populations are secure into the future. The species is not widely cultivated in gardens, with successful propagation difficult and rare with traditional techniques, such as seed germination, being unreliable. [3] [7] Despite the challenges mentioned, seeds have been collected, and are stored to Tasmanian Seed Conservation Centre. [13]

Agastachys odorata is known to be highly susceptible to Phytophthora cinnamomi dieback. [14] The root-rot fungus puts the species at risk into the future as the disease spreads across Tasmania. [14]

However, organisations such as Australian Native Plant Society, rate the overall conservation status of the species as "Not considered to be at risk in the wild". [9]


Related Research Articles

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<i>Lomatia tasmanica</i> Tasmanian shrub from the family Proteaceae

Lomatia tasmanica, commonly known as King's lomatia, is a shrub of the family Proteaceae native to Tasmania. Growing up to 8 metres (26 ft) tall, the plant has shiny green pinnate (lobed) leaves and bears red flowers in the summer, but yields neither fruit nor seeds. King's lomatia is unusual because all of the remaining plants are genetically identical clones. Because it has three sets of chromosomes and is therefore sterile, reproduction occurs only vegetatively: when a branch falls, that branch grows new roots, establishing a new plant that is genetically identical to its parent.

<i>Banksia serrata</i> Species of tree native to eastern Australia

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<i>Banksia brownii</i> Species of shrub in the family Proteaceae found in Australia

Banksia brownii, commonly known as feather-leaved banksia or Brown's banksia, is a species of shrub that grows in southwest Western Australia. A plant with fine feathery leaves and large red-brown flower spikes, it usually grows as an upright bush around two metres (6.6 ft) high, but can also occur as a small tree or a low spreading shrub. First collected in 1829 and published the following year, it is placed in Banksiasubgenus Banksia, section Oncostylis, series Spicigerae. There are two genetically distinct forms.

<i>Banksia hookeriana</i> Species of shrub in the genus Banksia native to Western Australia

Banksia hookeriana, commonly known as Hooker's banksia, is a species of shrub of the genus Banksia in the family Proteaceae. It is native to the southwest of Western Australia and can reach up to 4 m (13 ft) high and 3 m (9.8 ft) wide. This species has long narrow serrated leaves and large, bright flower spikes, initially white before opening to a bright orange that appear over the cooler months. The flowers are pollinated by honeyeaters. The ageing flower spikes develop woody seed pods known as follicles. B. hookeriana is serotinous — large numbers of seeds are stored in the plant canopy for years until the plants are burnt by bushfire.

<i>Banksia telmatiaea</i> Australian shrub that grows in marshes and swamps

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<i>Banksia victoriae</i> Species of shrub or tree in the family Proteaceae endemic to Western Australia

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<i>Banksia violacea</i> Species of plant

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<span class="mw-page-title-main">Proteaceae</span> Family of flowering plants

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<i>Telopea truncata</i> Shrub in the family Proteaceae endemic to Tasmania

Telopea truncata, commonly known as the Tasmanian waratah, is a plant in the family Proteaceae. It is endemic to Tasmania where it is found on moist acidic soils at altitudes of 600 to 1200 m (2000–4000 ft). Telopea truncata is a component of alpine eucalypt forest, rainforest and scrub communities. It grows as a multistemmed shrub to a height of 3 metres (10 ft), or occasionally as a small tree to 10 m (35 ft) high, with red flower heads, known as inflorescences, appearing over the Tasmanian summer and bearing 10 to 35 individual flowers. Yellow-flowered forms are occasionally seen, but do not form a population distinct from the rest of the species.

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<i>Persoonia muelleri</i> Species of shrub

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<i>Orites revolutus</i> Species of plant in the family Proteaceae endemic to Tasmania

Orites revolutus , also known as narrow-leaf orites, is a Tasmanian endemic plant species in the family Proteaceae. Scottish botanist Robert Brown formally described the species in Transactions of the Linnean Society of London in 1810 from a specimen collected at Lake St Clair. Abundant in alpine and subalpine heath, it is a small to medium shrub 0.5 to 1.5 m tall, with relatively small, blunt leaves with strongly revolute margins. The white flowers grow on terminal spikes during summer. Being proteaceaous, O. revolutus is likely to provide a substantial food source for nectivorous animal species within its range.

<i>Cenarrhenes</i> Monotypic genus of plants in the family Proteaceae

Cenarrhenes is a monytypic genus in the family Proteaceae containing the single species Cenarrhenes nitida, known as the Port Arthur plum or native plum. Cenarrhenes nitida is an evergreen shrub to small tree endemic to the rainforests and scrublands of western Tasmania. It bears white flowers in late spring followed by the development of fleshy fruit.

<i>Orites diversifolia</i> Species of flowering plant

Orites diversifolia (=diversifolius), commonly known as variable orites, is a member of the family Proteaceae and is endemic to Tasmania. The common name stems from the variable form of the leaves, which range from entire and linear to serrated and ovate. It is a common shrub in lowland rainforest, subalpine woodland and scrub.

Xanthorrhoea bracteata, the shiny grasstree, is a species of grasstree of the genus Xanthorrhoea endemic to Tasmania, Australia. It is one of many species described by Scottish botanist Robert Brown.

Xanthorrhoea arenaria, the sandy grasstree, is a species of grasstree endemic to Tasmania, Australia.

References

  1. 1 2 "Agastachys odorata R.Br". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
  2. 1 2 "Agastachys R.Br". Flora of Australia Online. Department of the Environment and Heritage, Australian Government.
  3. 1 2 3 4 5 6 7 8 9 10 "Agastachys odorata". anpsa.org.au. Retrieved 2022-02-28.
  4. "Cenarrheninae L.A.S.Johnson & B.G.Briggs". Flora of Australia Online. Department of the Environment and Heritage, Australian Government.
  5. Weston, Peter H.; Barker, Nigel P. (2006). "A new suprageneric classification of the Proteaceae, with an annotated checklist of genera". Telopea. 11 (3): 314–344. doi: 10.7751/telopea20065733 .
  6. 1 2 3 4 5 6 7 8 J.B. Kirkpatrick; Sue Backhouse (2007). Native Trees of Tasmania, Seventh Edition Completely Revised. Sandy Bay, Tasmania: Pandani Press. ISBN   978-0-646-43088-1.
  7. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Howells, Christine (2021). Tasmania's Natural Flora. Hobart: Australian Plants Society Tasmania INC., Hobart Group. p. 289.
  8. 1 2 3 4 5 6 7 8 9 University of Tasmania. "Key to Tasmanian Dicots".
  9. 1 2 3 4 5 6 "Agastachys odorata". Australian Plants Society Tasmania inc. Retrieved 2022-02-28.
  10. 1 2 "Agastachys odorata R.Br". Flora of Australia Online. Department of the Environment and Heritage, Australian Government.
  11. 1 2 Brown, M; Kirkpatrick, Jamie; Moscal, A (1983). An Atlas of Tasmania's Endemic Flora. Hobart: The Tasmanian Conservation Trust Incorporated.
  12. 1 2 3 Raven, Peter (2012). Biology of Plants. New York: Peter Marshall. pp. 700–702. ISBN   978-1-4292-1961-7.
  13. Dmartin (2019). "Records of the Tasmanian Seed Conservation Centre". Australian Seedbank Partnership. doi:10.15468/77eqit.{{cite journal}}: Cite journal requires |journal= (help)
  14. 1 2 Schahinger, R.; Rudman T.; Wardlaw, T. J. (2003). "Conservation of Tasmanian Plant Species & Communities threatened by Phytophthora cinnamomi. Strategic Regional Plan for Tasmania" (PDF). Hobart, Tasmania: Department of Primary Industries, Water and Environment. pp. (appendix). Archived from the original (PDF) on 1 April 2012. Retrieved 17 September 2012.