Stenanthemum arens

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Stenanthemum arens
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rhamnaceae
Genus: Stenanthemum
Species:
S. arens
Binomial name
Stenanthemum arens

Stenanthemum arens is a species of flowering plant in the family Rhamnaceae and is endemic to South Australia. It is a twiggy shrub with broadly egg-shaped to almost circular leaves and heads of 10 to 20 silky-hairy white, tube-shaped flowers, usually with whitish floral leaves.

Contents

Description

Stenanthemum arens is a twiggy shrub, its young stems covered with soft or shaggy, greyish or rust-coloured hairs. Its leaves are broadly egg-shaped with the narrower end towards the base, or almost round, 4–7 mm (0.16–0.28 in) long and wide on a petiole 1–2 mm (0.039–0.079 in) long, with narrowly triangular to linear stipules 2–4 mm (0.079–0.157 in) long at the base. Both surfaces of the leaves are covered with greyish, star-shaped hairs. The leaves are often folded lengthwise. The flowers are borne in groups of 10 to 20 up to 10 mm (0.39 in) wide with bracts 1.5–2.5 mm (0.059–0.098 in) long and surrounded by whitish flower leaves. Each flower is on a shaggy-hair pedicel up to 0.2 mm (0.0079 in) long. The floral tube is 0.9–1.2 mm (0.035–0.047 in) long and 1.2–1.5 mm (0.047–0.059 in) wide, the sepals 1.2–1.4 mm (0.047–0.055 in) long and the petals 0.7–0.8 mm (0.028–0.031 in) long. Flowering has been observed in July, and the fruit is 2.2–3.0 mm (0.087–0.118 in) long. [2] [3]

Taxonomy and naming

Stenanthemum arens was first formally described in 2007 by Kevin Thiele in the Journal of the Adelaide Botanic Gardens from specimens collected by John Carrick in 1969. [2] [4] The specific epithet (arens) means "dry or parched", referring to the appearance of the plant as well as its habitat. [2]

Distribution and habitat

This species grows on rocky hills in the north-west Gawler Ranges of South Australia. [2]

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References

  1. ↑ "Stenanthemum arens". Australian Plant Census. Retrieved 26 November 2022.
  2. 1 2 3 4 Thiele, Kevin R. (2007). "Two new species of Australian Stenanthemum (Rhamnaceae), with a conspectus and key to species outside Western Australia" (PDF). Journal of the Adelaide Botanic Gardens. 21: 66–69. Retrieved 26 November 2022.
  3. ↑ Kellerman, Jurgen; Thiele, Kevin R. Kodela, Phillip G. (ed.). "Stenanthemum arens". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 26 November 2022.
  4. ↑ "Stenanthemum arens". APNI. Retrieved 26 November 2022.
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