Elaeagnus pungens
| Elaeagnus pungens | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | |
| (unranked): | |
| (unranked): | |
| (unranked): | |
| Order: | |
| Family: | |
| Genus: | |
| Species: | E. pungens
|
| Binomial name | |
| Elaeagnus pungens | |
Elaeagnus pungens is a species of flowering plant in the oleaster family known by the common names thorny-olive and silverthorn. It is native to Asia, including China and Japan. It is present in the southeastern United States as an introduced species, a common landscaping and ornamental plant, and sometimes an invasive species.[1]
This plant is a dense, branching shrub which can reach over 7 metres (23 ft) tall by 4 metres (13 ft) wide. It sprouts prolifically from its stem, spreading out and twining into adjacent vegetation. Parts of the stem are covered in thorns which can be up to 8 centimetres (3.1 in) long. The evergreen, alternately-arranged leaves are up to 10 centimetres (3.9 in) long but under 5 centimetres (2.0 in) wide. The undersides are silvery white with brown flecks. Tubular flowers are borne in clusters of up to three.[1] The flowers are yellowish or white and are sweet-scented.[2] The fruit is a drupe up to 1.5 centimetres (0.59 in) long which contains one seed.[1] It is reddish with silver scales.[2] Blooming occurs in the fall and fruit develops during the spring. The plant grows quickly, with shoots growing over one meter per season. The growth has been described as "aggressive", with shoots extending many meters into neighboring treetops. The seeds are dispersed by birds.[1]
In China this plant occurs on hillsides and in thickets. In Japan it grows in scrub dominated by Quercus phillyraeoides and Pittosporum tobira. This plant was introduced to the United States from Asia in 1830. It has been used extensively as a landscaping plant. Its densely packed, spreading form has proved useful along roadsides and highway medians. It was also used to revegetate abandoned mining sites in Kentucky and other areas. It took hold easily and still persists in these places. It also spread into the wild, having escaped cultivation. In North Carolina it has been reported from longleaf pine forests, urban and maritime forests, and oak-hickory woodlands. In Alabama it grows in urban areas and in protected, natural habitats as a weed. It tolerates varied environmental conditions, including heat, cold, wind, coastal conditions, shade, and full sun. It is very drought-tolerant. It can grow in varied soil types, including those found at mine spoils.[1]
Many birds feed on the fruits of the shrub. Birds are most attracted to the plants that produce the most fruit.[1] Studies have found that cedar waxwings attracted to roadside plantings of the shrub are susceptible to automobile-related mortality. In Brazos County, Texas between 8 March and 5 April 1981, researchers counted 298 cedar waxwings that had been killed while trying to get fruits from thorny-olive shrubs growing along one highway.[1]
The plant is invasive in some habitats. It is still widely sold in nurseries.[1] Commercially available cultivars include 'Maculata', which has gold coloration on the leaves,[3] as well as 'Fruitlandii' and 'Hosoba-Fukurin'.[4]
References
- ^ a b c d e f g h Gucker, Corey L. (2011). Elaeagnus pungens. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. Retrieved 1 March 2012.
- ^ a b Elaeagnus pungens. Center for Aquatic and Invasive Plants, University of Florida IFAS. Retrieved 1 March 2012.
- ^ E. pungens 'Maculata'. BBC Plant Finder. Retrieved 1 March 2012.
- ^ E. pungens. NC State University. Retrieved 1 March 2012.