Zieria cytisoides

Zieria cytisoides, commonly known as the downy zieria, is a plant in the citrus family Rutaceae and is endemic to eastern Australia. It is a bushy shrub with three-part, clover-like leaves and small clusters of pale to deep pink flowers with four petals and four stamens.

Downy zieria
Zieria cytisoides growing near Bega
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Rutaceae
Genus: Zieria
Species:
Z. cytisoides
Binomial name
Zieria cytisoides

Description

Zieria cytisoides is a bushy shrub which usually grows to a height of up to 3 m (10 ft) with its branches covered with velvety hairs. The leaves are composed of three leaflets with the central one elliptic to egg-shaped, 15–40 mm (0.6–2 in) long and 4–15 mm (0.2–0.6 in) wide and with a petiole 3–11 mm (0.1–0.4 in) long. The leaflets are flat, sometimes with their edges rolled under. They are dark green and covered with short, soft hairs on the upper surface and grey-green, covered with velvety hairs on the lower surface.[2][3][4]

Pale to deep pink, rarely white flowers are arranged in clusters of between 3 and 30 in leaf axils with a persistent bract 8–10 mm (0.3–0.4 in) at the base of the cluster. The clusters are about the same length as the leaves, but often longer or shorter. The sepals are triangular, about 3 mm (0.1 in) long and covered with soft hairs. The four petals are 3.5–5.5 mm (0.1–0.2 in) long, have a covering of soft hairs and do not overlap each other. There are four stamens. Flowers are present in winter and spring and are followed by velvety follicles containing black to reddish-brown seeds.[2][3]

Taxonomy and naming

Downy zieria was first formally described in 1818 by James Edward Smith and the description was published in The Cyclopaedia.[1][5] The specific epithet (cytisoides) alludes to a similarity between this species and one of the genus Cytisus, but the connection is not clear.[4] (The suffix -oides means "likeness" in Latin.)[6]

Distribution and habitat

Zieria cytisoides occurs in Queensland, New South Wales and Victoria. It is most common and widespread in New South Wales where it grows in forest woodland and heath, often in sandy soil on rocky slopes from coastal areas to the western slopes of the Great Dividing Range.[2]

Use in horticulture

This zieria is most easily propagated from cuttings and is hardy in well-drained soil in full sun or part shade. In the Australian National Botanic Gardens it grows as a compact shrub with little pruning and is resistant to pests and diseases.[4][7]

References
  1. "Zieria cytisoides". APNI. Retrieved 18 January 2017.
  2. Armstrong, James Andrew; Harden, Gwen. "Zieria cytisoides". Royal Botanic Garden Sydney: plantnet. Retrieved 18 January 2017.
  3. Duretto, Marco. "Zieria cytisoides". Royal Botanic Gardens Victoria: vicflora. Retrieved 18 January 2017.
  4. "Zieria cytisoides". Australian National Botanic Gardens. Retrieved 18 January 2017.
  5. Smith, James Edward (1818). Rees's Cyclopædia (volume 39). London: Longman, Hurst, Rees, Orme and Brown. Retrieved 18 January 2017.
  6. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 483.
  7. Wrigley, John W.; Fagg, Murray (1983). Australian native plants : a manual for their propagation, cultivation and use in landscaping (2nd ed.). Sydney: Collins. p. 308. ISBN 0002165759.
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