Eucalyptus yarraensis

Eucalyptus yarraensis, commonly known as Yarra gum,[2] is a tree species that is endemic to Victoria, Australia. It has rough bark on the trunk and larger branches, lance-shaped to elliptical or egg-shaped adult leaves, flower buds in groups of seven, white flowers and conical fruit. In 2021 the Victorian Government listed it as critically endangered under the Flora and Fauna Guarantee Act.[3]

Yarra gum
Eucalyptus yarraensis near Arthurs Creek, Victoria
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Eucalyptus
Species:
E. yarraensis
Binomial name
Eucalyptus yarraensis
flower buds and flowers
fruit

Description

Eucalyptus yarraensis is a tree that typically grows to a height of 15–20 m (49–66 ft) and forms a lignotuber. It has rough, fibrous, brown or greyish bark on the trunk and larger branches, smooth white to cream-coloured bark above. Young plants and coppice regrowth have glossy green, elliptical to egg-shaped leaves that are 25–63 mm (0.98–2.48 in) long and 20–43 mm (0.79–1.69 in) wide. Adult leaves are arranged alternately, the same shade of glossy green on both sides, lance-shaped to elliptical or egg-shaped, 60–135 mm (2.4–5.3 in) long and 17–40 mm (0.67–1.57 in) wide, tapering to a petiole 10–28 mm (0.39–1.10 in) long. The flower buds are arranged in leaf axils in groups of seven on an unbranched peduncle 4–15 mm (0.16–0.59 in) long, the individual buds on pedicels 2–3 mm (0.079–0.118 in) long. Mature buds are oval to diamond-shaped, 3–6 mm (0.12–0.24 in) long and 3–4 mm (0.12–0.16 in) wide with a conical or beaked operculum that is about the same length as the floral cup. Flowering occurs from September to December and the flowers are white. The fruit is a woody, conical capsule 3–5 mm (0.12–0.20 in) long and 4–5 mm (0.16–0.20 in) wide with the valves near rim level.[2][4][5]

Taxonomy and naming

Eucalyptus yarraensis was first formally described in 1922 by Joseph Maiden and Richard Cambage in Maiden's book, A Critical Revision of the Genus Eucalyptus, from material collected by Cambage in the Yarra Valley near Healesville.[6][7]

Distribution and habitat

Yarra gum grows in valleys and nearby slopes in open woodland, now mostly cleared for agricultural use. It is found between Melbourne, Daylesford and Ararat.[4][5]

See also

References
  1. "Eucalyptus yarraensis". Australian Plant Census. Retrieved 24 January 2020.
  2. Brooker, M. Ian H.; Slee, Andrew V. "Eucalyptus yarraensis". Royal Botanic Gardens Victoria. Retrieved 24 January 2020.
  3. Flora and Fauna Guarantee Act 1988 - Threatened List (PDF). 2021.
  4. "Eucalyptus yarraensis". Euclid: Centre for Australian National Biodiversity Research. Retrieved 27 May 2020.
  5. Chippendale, George M. "Eucalyptus yarraensis". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 24 January 2020.
  6. "Eucalyptus yarraensis". APNI. Retrieved 24 January 2020.
  7. Maiden, Joseph (1922). A Critical Revision of the Genus Eucalyptus. Sydney: New South Wales Government Printer. pp. 17–18. Retrieved 24 January 2020.
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