Philotheca salsolifolia

Philotheca salsolifolia is a species of flowering plant in the family Rutaceae and is endemic to New South Wales and the Australian Capital Territory. It is a shrub with crowded, more or less cylindrcal leaves and pink to mauve flowers with a dark central stripe and arranged singly or in twos or threes on the ends of branchlets.

Philotheca salsolifolia
In Muogamarra Nature Reserve
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Rutaceae
Genus: Philotheca
Species:
P. salsolifolia
Binomial name
Philotheca salsolifolia
Synonyms[1]
  • Eriostemon gracile Graham
  • Eriostemon salsolifolia Sm. orth. var.
  • Eriostemon salsolifolius Sm.
  • Philotheca australis Rudge nom. illeg.
  • Philotheca australis Rudge var. australis
  • Philotheca gaudichaudii G.Don nom. inval., nom. subnud.

Description

Philotheca salsolifolia is a shrub that typically grows to a height of 2 m (6 ft 7 in) and has more or less glabrous branchlets. The leaves are crowded, thick and from cylindrical, 3–5 mm (0.12–0.20 in) long to narrow, pointed and up to 12 mm (0.47 in) long. The flowers are arranged singly or in twos or threes on the ends of branchlets, each flower on a top-shaped pedicel 1–2 mm (0.039–0.079 in) long or a thin pedicel about 8 mm (0.31 in) long. The five sepals are triangular, about 1.5 mm (0.059 in) long and the five petals are narrow elliptic, 6–12 mm (0.24–0.47 in) long and pink to mauve with a dark central stripe. The ten stamens are glabrous, fused together in the lower half, and densely hairy above. Flowering occurs from September to December and the fruit is 5–6 mm (0.20–0.24 in) long with a pointed tip.[2][3][4]

Taxonomy

This species was first formally described in 1809 by James Edward Smith and given the name Eriostemon salsolifolius in Rees's The Cyclopaedia.[5][6] In 1917, George Claridge Druce changed the name to Philotheca salsolifolia in The Botanical Exchange Club and Society of the British Isles Report for 1916, Supplement 2.[7]

In 1998, Paul Wilson described two subspecies in the journal Nuytsia, and the names are accepted by the Australian Plant Census:[8]

  • Philotheca salsolifolia subsp. pedicellata Paul G.Wilson[9] has thin pedicels 6–9 mm (0.24–0.35 in) long and leaves 8–15 mm (0.31–0.59 in) long;[4]
  • Philotheca salsolifolia (Sm.) Druce subsp. salsolifolia[10] has top-shaped pedicels 1–2 mm (0.039–0.079 in) long and leaves 3–5 mm (0.12–0.20 in) long.[4]

Distribution and habitat

Philotheca salsolifolia grows in heath in rocky or sandy places in forest and woodland. It is widespread in New South Wales and the Australian Capital Territory, from near Yamba in the north to Bega on the south coast and as far inland as West Wyalong and the Pilliga scrub.[4] Subspecies pedicellata is only known from near Angourie on the north coast of New South Wales where it grows in coastal or near-coastal sand.[11]

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References
  1. "Philotheca salsolifolia". Australian Plant Census. Retrieved 13 August 2020.
  2. Wilson, Paul G.; Wilson, Annette J.G. (ed.) (2013). Flora of Australia (Volume 26). Canberra: Australian Biological Resources Study. p. 370. Retrieved 13 August 2020.CS1 maint: extra text: authors list (link)
  3. Wilson, Paul G. (1970). "A taxonomic revision of the genera Crowea, Eriostemon and Phebalium (Rutaceae)". Nuytsia. 1 (1): 34–35. Retrieved 13 August 2020.
  4. Weston, Peter H.; Harden, Gwen J. "Philotheca salsolifolia". Royal Botanic Garden Sydney. Retrieved 13 August 2020.
  5. "Eriostemon salsolifolius". APNI. Retrieved 13 August 2020.
  6. Smith, James Edward; Rees, Abraham (ed.) (1809). Rees's Cyclopædia. London: Longman, Hurst, Rees, Orme and Brown. Retrieved 13 August 2020.CS1 maint: extra text: authors list (link)
  7. "Philotheca salsolifolia". APNI. Retrieved 13 August 2020.
  8. Wilson, Paul G. (1998). "A Taxonomic Review of the genera Eriostemon and Philotheca". Nuytsia. 12 (2): 254–255. Retrieved 13 August 2020.
  9. "Philotheca salsolifolia subsp. pedicellata". Australian Plant Census. Retrieved 13 August 2020.
  10. "Philotheca salsolifolia subsp. salsolifolia". Australian Plant Census. Retrieved 13 August 2020.
  11. Wilson, Paul G.; Wilson, Annette J.G. (ed.) (2013). Flora of Australia (Volume 26). Canberra: Australian Biological Resources Study. p. 371. Retrieved 13 August 2020.CS1 maint: extra text: authors list (link)
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