Petrophile pedunculata

Petrophile pedunculata, commonly known as conesticks,[2] is a species of flowering plant in the family Proteaceae and is endemic to New South Wales. It has divided leaves with needle-shaped pinnae and oval heads of sparsely hairy yellow or cream-coloured flowers, the heads on a peduncle 10–15 mm (0.39–0.59 in) long.

Conesticks
Petrophile pedunculata
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Proteales
Family: Proteaceae
Genus: Petrophile
Species:
P. pedunculata
Binomial name
Petrophile pedunculata
Synonyms[1]
  • Atylus Salisb. nom. rej.
  • Arthrostygma Steud. nom. inval., pro syn.
Fruit

Description

Petrophile pedunculata is an erect, spindly to bushy shrub that typically grows to a height of up to 2.5 m (8 ft 2 in) and has glabrous branchlets and leaves. The leaves are pinnate, needle-shaped but not sharply-pointed, 70–185 mm (2.8–7.3 in) long on a petiole 25–95 mm (0.98–3.74 in) long, with pinnae usually less than 20 mm (0.79 in) long. The flowers are arranged in leaf axils in oval heads 10–15 mm (0.39–0.59 in) long on a peduncle 10–15 mm (0.39–0.59 in) long. The flowers are about 7–10 mm (0.28–0.39 in) long, yellow or cream-coloured with a few soft hairs. Flowering occurs from October to January and the fruit is a nut, fused with others in an oval head up to 40 mm (1.6 in) long on a peduncle about 20 mm (0.79 in) long.[2][3]

This petrophile can be distinguished from the related P. pulchella which has flowers heads that are sessile or on peduncles up to 10 mm (0.39 in) long.[4]

Taxonomy

Petrophile pedunculata was first formally described in 1810 by Robert Brown in the Transactions of the Linnean Society of London from material collected near Port Jackson.[5][6]

Distribution and habitat

Petrophile pedunculata is found growing on shallow sandstone soils, often in open forest or heathlands. It is common along the coast of New South Wales between Port Jackson and Milton and on the ranges between the Blue Mountains and Marulan.[2][3]

References
  1. "Petrophile pedunculata". Australian Plant Census. Retrieved 24 December 2020.
  2. Harden, Gwen J. "New South Wales Flora Online: Petrophile pedunculata". Royal Botanic Gardens & Domain Trust, Sydney, Australia.
  3. Foreman, David B. "Petrophile pedunculata". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 24 December 2020.
  4. Harden, Gwen J. "New South Wales Flora Online: Genus Petrophile". Sydney, Australia: Royal Botanic Gardens & Domain Trust. Retrieved 30 November 2011.
  5. "Petrophile pedunculata". APNI. Retrieved 24 December 2020.
  6. Brown, Robert (1810). "On the Proteaceae of Jussieu". Transactions of the Linnean Society of London. 10 (1): 70. Retrieved 24 December 2020.
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