Stenanthemum patens

Priority One — Poorly Known Taxa (DEC)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rhamnaceae
Genus: Stenanthemum
Species:
S. patens
Binomial name
Stenanthemum patens

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.

Description

Stenanthemum patens is a shrub that typically grows to a height of up to 50 cm (20 in), its young stems densely hairy and with a few spines. Its leaves are egg-shaped to broadly egg-shaped with the narrower end towards the base, 5–8 mm (0.20–0.31 in) long and 4–5 mm (0.16–0.20 in) wide on a densely hairy petiole 1–2 mm (0.039–0.079 in) long, with stipules 1.3–2.5 mm (0.051–0.098 in) long and fused at the base. The tip of the leaves is curved downwards, both surfaces are hairy, and the lower surface is whitish. The flowers are arranged in densely hairy clusters 5–8 mm (0.20–0.31 in) wide, surrounded by egg-shaped to broadly egg-shaped involucral bracts 3–4 mm (0.12–0.16 in) long. The floral tube is 2.5–3 mm (0.098–0.118 in) long with lobes 2.0–2.5 mm (0.079–0.098 in) long, the sepals about 0.8 mm (0.031 in) long and the stamens about the same length as the sepals. Flowering occurs in August, and the fruit is a schizocarp about 3.5 mm (0.14 in) long.[2][3]

Taxonomy and naming

Stenanthemum patens was first formally described in 2001 by Barbara Lynette Rye in the journal Nuytsia from specimens collected in 1981.[4] The specific epithet (patens) means "open" or "outstretched", referring to the spreading branchlets of this species.[2]

Distribution and habitat

This species grows in low shrubland on rocky hillsides, and is only known from a few locations north of Leonara in the Murchison bioregion of inland Western Australia.[2][3][5]

Conservation status

Stenanthemum patens 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]

References

  1. ↑ "Stenanthemum patens". Australian Plant Census. Retrieved 13 January 2023.
  2. 1 2 3 Rye, Barbara L. (2001). "A taxonomic update of Stenanthemum (Rhamnaceae: Pomaderreae) in Western Australia". Nuytsia. 13 (3): 503–506. Retrieved 13 January 2023.
  3. 1 2 Kellerman, Jurgen; Thiele, Kevin R. Kodela, Phillip G. (ed.). "Stenanthemum patens". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 13 January 2023.
  4. ↑ "Stenanthemum patens". APNI. Retrieved 13 January 2023.
  5. 1 2 "Stenanthemum patens". 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 13 January 2023.
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