Brazilian nightshade Solanum seaforthianum

Transcription

1 Brazilian nightshade Solanum seaforthianum Click on images to enlarge Scientific Name Solanum seaforthianum Andrews Common Names blue potato vine, Brazilian night-shade, Brazilian nightshade, climbing nightshade, Italian jasmine, potato creeper, St. Vincent lilac, St. Vincent's lilac, star potato vine, vining solanum infestation (Photo: Sheldon Navie) Family Solanaceae Origin This species is believed to be native to Mexico, Central America (i.e. Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua and Panama), the Caribbean (i.e. Trinidad and Tobago), south-eastern USA (i.e. Florida) and tropical South America (i.e. Venezuela and Colombia). Naturalised Distribution Widely naturalised in the coastal districts of eastern Australia (i.e. in eastern Queensland and eastern New South Wales). Also naturalised in the coastal districts of northern Western Australia and sparingly naturalised in South Australia. infestation (Photo: Sheldon Navie) Widely naturalised overseas, including in tropical and southern Africa, eastern Asia and on some Pacific islands (e.g. Hawaii and New Caledonia). Cultivation Originally introduced as a garden ornamental, it may occasionally still be seen in cultivation. scrambling habit (Photo: Sheldon Navie) Habitat A common weed of untended areas with fertile soils. It is a weed of closed forests, forest margins, urban bushland, waterways (i.e. riparian areas), crops, roadsides, disturbed sites and waste areas. Distinguishing Features a long-lived scrambling or climbing vine. its alternately arranged leaves have deeply-lobed margins. 1 of 5 1/07/15 2:17 PM

2 its mauve or purple star-shaped flowers (2-3 cm across) are borne in drooping clusters. climbing habit (Photo: Sheldon Navie) its glossy red berries are 8-12 mm across. Habit A perennial vine with climbing or sprawling stems, often covering fences or shrubs, reaching up to 5 m in height. Stems and Leaves The stems are green and mostly hairless (i.e. glabrous), however there are often a few sticky (i.e. glandular) hairs on the flowering branches. alternately-arranged leaves (Photo: Sheldon Navie) The alternately arranged leaves are borne on stalks (i.e. petioles) cm long. Their leaf blades (4-13 cm long and 3-11 cm wide) are either deeply incised (i.e. pinnatisect), creating 3-9 lobes each up to cm long and 1-2 cm wide, or appear to be once-compound (i.e. pinnate). Both leaf surfaces are green and hairless (i.e. glabrous), except for a few hairs on their margins and along the veins on either surface. The tips of their lobes may be either rounded or pointed (i.e. they have obtuse to acuminate apices). Flowers and Fruit The star-like flowers (2-3 cm across) are arranged in large branched clusters in the leaf forks (i.e. axils), each cluster containing flowers. The main stalk (i.e. peduncle) of these clusters is 1-6 cm long, while each individual flower is borne on a smaller stalk (i.e. pedicel) 8-15 mm long. These flowers have five blue, violet or purple petals that are joined together at the base and have triangular tips (10-15 mm long). They also have five small green sepals ( mm long), five stamens with yellow anthers (3-4 mm long), and an ovary topped with a style (6.5-8 mm long) and stigma. Flowering occurs mainly during spring and autumn. The shiny globular berries (8-12 mm across) turn from green to bright red as they mature. They contain numerous reddish-brown to black flattened seeds (2-3 mm long). close-up of deeply-lobed leaf blade (Photo: Sheldon Navie) large drooping flower cluster (Photo: Sheldon Navie) Reproduction and Dispersal This species reproduces mainly by seed, which are most often dispersed by birds and other animals that eat the fleshy fruit. Impacts Brazilian nightshade (Solanum seaforthianum) is regarded as an environmental weed in New South Wales and Other Impacts flower cluster branches with flower buds and flowers 2 of 5 1/07/15 2:17 PM

3 The fruit are poisonous to humans. from side-on (Photo: Sheldon Navie) Similar Species Brazilian nightshade (Solanum seaforthianum) can be confused with bittersweet nightshade (Solanum dulcamara), cusmayllo (Solanum radicans) and potato vine (Solanum laxum ). These species can be distinguished by the following differences: Brazilian nightshade (Solanum seaforthianum) has three to nine-lobed leaves, mauve or purple flowers with petals mm long, and relatively large shiny red fruit (8-12 mm across). bittersweet nightshade (Solanum dulcamara) has three-lobed leaves, mauve or purple flowers with petals 5-8 mm long, and relatively large shiny red fruit (6-10 mm across). close-up of star-shaped bluish-purple flowers with yellow stamens (Photo: Sheldon Navie) cusmayllo (Solanum radicans) has three-lobed leaves, white flowers with petals 4-5 mm long, and relatively small yellowish-green fruit (4-6 mm across). potato vine (Solanum laxum ) has entire or three-lobed, white flowers with petals 9-15 mm long, and relatively large dark blue to black fruit (6-9 mm across). Note: For a more in-depth key to distinguish between all of the solanums (Solanum spp.) present in eastern Australia, see the online key to the Solanum Species of Eastern Australia at cluster of immature fruit (Photo: Sheldon Navie) Legislation Not declared or considered noxious by any state government authorities. Sources Anonymous (2006). Germplasm Resources Information Network (GRIN). National Germplasm Resources Laboratory, National Genetic Resources Program, Agricultural Research Service (ARS), United States Department of Agriculture (USDA), Beltsville, Maryland, USA. cluster of mature fruit (Photo: Sheldon Navie) Anonymous (2007). Solanum seaforthianum Andrews. Brazilian nightshade. Plants Profile. National Plant Data Center, National Resources Conservation Service, United States Department of Agriculture, Baton Rouge, Louisiana, USA. Anonymous (2007). Solanum seaforthianum Andrews, Solanaceae. Pacific Island Ecosystems at Risk (PIER): plant threats to Pacific Ecosystems. close-up of shiny red mature fruit (Photo: Sheldon 3 of 5 1/07/15 2:17 PM

4 /solanum_seaforthianum.htm. Institute of Pacific Islands Forestry, Hawaii, USA. Navie) Barker, B., Barker, R., Jessop, J. and Vonow, H. (2005). Census of South Australian Vascular Plants. Fifth Edition. The Botanic Gardens of Adelaide and State Herbarium, Government of South Australia, Adelaide, South Australia. Barry, S.J. (2000). Recovery Plan for the Endangered Vascular Plant Species Alectryon ramiflorus Reynolds. Report to Environment Australia. Environmental Protection Agency, Brisbane, Batianoff, G.N. and Butler, D.W. (2002). Assessment of invasive naturalized plants in south-east Plant Protection Quarterly 17: seedling (Photo: Sheldon Navie) Bean, A.R. (2006). Solanum species of Eastern Australia. /www/intro.htm. Queensland Herbarium, Toowong, Bostock, P.D. and Holland, A.E. (2007). Census of the Queensland Flora Queensland Herbarium, Environmental Protection Agency, Brisbane, Conn, B.J. (2007). Solanum seaforthianum Andrews. New South Wales Flora Online. PlantNET - young plant (Photo: Sheldon Navie) The Plant Information Network System of Botanic Gardens Trust. Royal Botanic Gardens and Domain Trust, Sydney, New South Wales. Kleinschmidt, H.E., Holland, A. and Simpson, P. (1996). Suburban Weeds. Third Edition. Department of Primary Industries, Brisbane, Navie, S.C., Markwell, B., Playford, J. and Adkins, S.W. (2002). Suburban and Environmental Weeds: an interactive identification and information system. CD-ROM. The University of Queensland, St. Lucia, Spooner, A., Carpenter, J., Smith, G. and Spence, K. (2007). *Solanum seaforthianum Andrews. FloraBase: The Western Australian Flora. Western Australian Herbarium, Department of Conservation and Land Management (CALM), Perth, Western Australia. Stanley, T.E. and Ross, E.M. (1986). Flora of South-eastern Volume 2. Department of Primary Industries, Brisbane, Fact sheets are available from Department of Employment, Economic Development and Innovation (DEEDI) service centres and our Customer Service Centre (telephone ). Check our website at to ensure you have the latest version of this fact sheet. The control methods referred to in this fact sheet should be used in accordance with the restrictions (federal and state legislation, and local government laws) directly or indirectly related to each control method. These restrictions may prevent the use of one or more of the methods referred to, depending on individual circumstances. While every care is taken to ensure the accuracy of this information, DEEDI does not invite reliance upon it, nor accept responsibility for any loss or damage caused by actions based on it. 4 of 5 1/07/15 2:17 PM

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