Stenanthemum yorkense

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Stenanthemum yorkense
Status DECF P1.svg
Priority One — Poorly Known Taxa (DEC)
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rhamnaceae
Genus: Stenanthemum
Species:
S. yorkense
Binomial name
Stenanthemum yorkense

Stenanthemum yorkense is a species of flowering plant in the family Rhamnaceae and is endemic to an area near York in the southwest of Western Australia. It is a low, spreading shrub with egg-shaped leaves, the narrower end towards the base, and densely crowded, head-like clusters of white, tube-shaped flowers with a yellow centre.

Contents

Description

Stenanthemum yorkense is a spreading shrub that typically grows to a height of 10–15 cm (3.9–5.9 in), its young stems densely covered with whitish hairs. Its leaves are grass-like at first, later egg-shaped to broadly egg-shaped, the narrower end towards the base, 8–17 mm (0.31–0.67 in) long and 4–8 mm (0.16–0.31 in) wide on a densely hairy petiole 3–4 mm (0.12–0.16 in) long. There are stipules 5–6 mm (0.20–0.24 in) long and fused for about half their length at the base of the leaf. The flowers are white with a yellow centre, and borne in clusters up to 14 mm (0.55 in) wide. The floral tube is densely hairy, 3.5–4.5 mm (0.14–0.18 in) long, the sepals densely covered with curly hairs and about 1.3 mm (0.051 in) long. The petals are about 0.6 mm (0.024 in) long, and the fruit is spherical and about 2 mm (0.079 in) long and densely hairy. [2] [3]

Taxonomy and naming

Stenanthemum yorkense was first formally described in 2007 by Barbara Lynette Rye in the journal Nuytsia from specimens collected near York in 2005. [3] [4] The specific epithet (yorkense) refers to the type location. [3]

Distribution and habitat

This species is only known from a single hill or hills on private land near York, where a large populations grows on quartzite under Eucalyptus accedens and Allocasuarina trees. [2] [3] [5]

Conservation status

Stenanthemum yorkense is listed as "Priority One" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions, [5] meaning that it is known from only one or a few locations which are potentially at risk. [6]

Related Research Articles

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Cryptandra inconspicua is a flowering plant in the family Rhamnaceae and is endemic to the southwest of Western Australia. It is a small, spreading shrub with narrowly elliptic to egg-shaped leaves and head-like clusters of white, tube-shaped flowers.

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Stenanthemum liberum is a species of flowering plant in the family Rhamnaceae and is endemic to the southwest of Western Australia. It is a dwarf or prostrate shrub with densely hairy young stems, elliptic to egg-shaped with the narrower end towards the base, and densely hairy heads of tube-shaped flowers.

Stenanthemum limitatum is a species of flowering plant in the family Rhamnaceae and is endemic to the southwest of Western Australia. It is an erect or straggling shrub with sparsely hairy young stems, egg-shaped to fan-shaped leaves and greyish, softly-hairy heads of white or cream-coloured flowers.

Stenanthemum mediale is a species of flowering plant in the family Rhamnaceae and is endemic to inland Western Australia. It is an erect shrub with densely hairy young stems, egg-shaped leaves and densely hairy heads of silvery to rust-coloured flowers.

<i>Stenanthemum nanum</i> Species of flowering plant

Stenanthemum nanum is a species of flowering plant in the family Rhamnaceae and is endemic to the south-west of Western Australia. It is a prostrate shrub with hairy young stems, broadly egg-shaped leaves with the narrower end towards the base, and densely silvery-hairy heads of white or cream-coloured flowers.

Cryptandra minutifolia is a flowering plant in the family Rhamnaceae and is endemic to the south-west of Western Australia. It is a spreading shrub with oblong to elliptic leaves and clusters of white or pink, tube-shaped flowers.

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Stenanthemum notiale is a species of flowering plant in the family Rhamnaceae and is native to Western Australia, South Australia and Victoria. It is a small, erect to prostrate shrub with hairy young stems, egg-shaped leaves with the narrower end towards the base, and clusters of white to cream-coloured or greenish yellow, densely shaggy-hairy flowers.

Stenanthemum patens is a species of flowering plant in the family Rhamnaceae and is endemic to the inland of Western Australia. It is a small shrub with densely hairy young stems and a few spines, egg-shaped to broadly egg-shaped leaves with the narrower end towards the base, and densely hairy clusters of tube-shaped flowers.

Stenanthemum petraeum is a species of flowering plant in the family Rhamnaceae and is native to inland Western Australia and the Northern Territory. It is a woody, erect shrub with densely hairy young stems, broadly egg-shaped to more or less round leaves, and clusters of white, densely shaggy- to woolly-hairy flowers.

Stenanthemum poicilum is a species of flowering plant in the family Rhamnaceae and is endemic to the south-west of Western Australia. It is an erect or low-lying shrub with hairy young stems, broadly egg-shaped leaves with the narrower end towards the base, and clusters of densely hairy white flowers.

<i>Stenanthemum pumilum</i> Species of flowering plant

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Stenanthemum radiatum is a species of flowering plant in the family Rhamnaceae and is endemic to a restricted part of the southwest of Western Australia. It is a spreading shrub with narrowly triangular or wedge-shaped to heart-shaped leaves and densely crowded, head-like clusters of white, densely hairy, tube-shaped flowers.

<i>Stenanthemum reissekii</i> Species of flowering plant

Stenanthemum reissekii is a species of flowering plant in the family Rhamnaceae and is endemic to the south-west of Western Australia. It is an erect or low-lying shrub with hairy young stems, egg-shaped or narrowly egg-shaped leaves with the narrower end towards the base, and clusters of densely hairy white or cream-coloured flowers.

Stenanthemum stipulosum is a species of flowering plant in the family Rhamnaceae and is endemic to inland Western Australia. It is an erect or low-lying shrub with densely hairy young stems, egg-shaped with the narrower end towards the base, and clusters of 10 to 30 densely hairy white or cream-coloured flowers, sometimes surrounded by whitish floral leaves.

Stenanthemum sublineare is a species of flowering plant in the family Rhamnaceae and is endemic to the southwest of Western Australia. It is an erect shrub with sparsely hairy young stems, narrowly egg-shaped to linear leaves, and small clusters of densely hairy, greenish, tube-shaped flowers.

References

  1. ↑ "Stenanthemum yorkense". Australian Plant Census. Retrieved 17 February 2023.
  2. 1 2 Kellerman, Jurgen; Thiele, Kevin R. Kodela, Phillip G. (ed.). "Stenanthemum yorkense". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 17 February 2023.
  3. 1 2 3 4 Rye, Barbara L. (2007). "New species and keys for Cryptandra and Stenanthemum (Rhamnaceae) in Western Australia" (PDF). Nuytsia. 16 (2): 380–381. Retrieved 17 February 2023.
  4. ↑ "Stenanthemum yorkense". APNI. Retrieved 17 February 2023.
  5. 1 2 "Stenanthemum yorkense". FloraBase . Western Australian Government Department of Biodiversity, Conservation and Attractions.
  6. ↑ "Conservation codes for Western Australian Flora and Fauna" (PDF). Government of Western Australia Department of Parks and Wildlife. Retrieved 17 February 2023.
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