*Solanum triflorum Nutt., Gen. N. Amer. Pl. 1: 128 (1818)
T: Near Fort Mandan, North Dakota, U.S.A.; ?BM n.v.
Sprawling annual herb, green, sparsely pubescent with simple hairs; stems to 1 m long, sometimes rooting at nodes; prickles absent.
Leaves ovate or elliptic; lamina 2–4 cm long, 1–2.5 cm wide, concolorous, shallowly lobed or dentate to deeply lobed; margin recurved and thickened; petiole 5–10 mm long.
Inflorescence short, 1–3–flowered, with small terminal leaflet; peduncle 10–30 mm long; pedicels 3–5 mm long. Calyx 3–5 mm long; lobes lanceolate to narrowly triangular, 1.5–2 mm long, slightly larger and becoming reflexed in fruit. Corolla stellate, 5–6 mm diam., white or rarely pale lavender. Anthers 2.5 mm long.
Berry globular, 8–12 mm diam., whitish-green, marbled. Seeds 1–2 mm long, light brownish-yellow. Stone-cell granules c. 1 mm diam. n=12.
Another description is available at http://delta-intkey.com/solanum/www/trifloru.htm
Distribution and ecology
Native to North America, locally naturalised in north-western Europe.
In Australia naturalised in cool temperate areas of south-eastern Qld, N.S.W., Vic., south-eastern S.A. and south-western W.A.
Cut-leaved nightshade, Cutleaf nightshade
A member of subg. Potatoe, species of which are usually creepers or vines with deeply lobed leaves and lacking spines or stellate hairs. American in origin.
Other species of this group in Australia are S. dulcamara, S. palitans, S. seaforthianum, S. laxum and S. tuberosum.
An annual summer weed of cultivation, characterised by its “evil smell”.
Suspected of poisoning sheep and cattle. Specimens with shallowly lobed leaves approach the European S. triflorum var. ponticum (Prodan) Borza.
Cutleaf Nightshade was first recorded as a naturalised plant in 1916 from Cooma, New South Wales (Symon 1981).
Derivation of epithet
tri-florum, Latin for three-flowered, a reference to the number of flowers in the inflorescence.
W.A.: Wickepin area, 29 Mar. 1978, V.M. Leeson & Son (PERTH). S.A.: c. 80 km NW of Bordertown, 12 Feb. 1963, I.R. Fry (AD). Qld: near Ballandean, 20 Feb. 1974, I.F. Swan (BRI). N.S.W: Finley, D.E. Symon 9807 (AD, NSW). Vic.: Tambo River, T.B. Muir 2789 (MEL).
Plant status, if any
Currently declared as a Noxious weed in WA (Unassessed) and Tasmania - see http://www.weeds.org.au/docs/weednet6.pdf
See www.dpiw.tas.gov.au/inter.nsf/webpages/jbrn-6vu2v8?open for the Tasmanian Government sheet on this species.
From the web
Further information and links can be found on the Weeds in Australia site.
Limited information is as yet available on the Solanaceae Source site.