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Solanum Elaeagnifolium Cav. R.J R.A. Stanton J.W. Heap Solanum elaeagnifolium Cav. R.J. Carter H. Wu Name Lower leaves c. 10 × 4 cm, oblong-lanceolate, distinctly sinuate-undulate, upper leaves smaller, Solanum elaeagnifolium Cav. is commonly known oblong, entire, venation usually prominent in in Australia as silverleaf nightshade. Solanum is dried specimens, base rounded or cuneate, apex from the Latin solamen, ‘solace’ or ‘comfort’, in acute or obtuse; petiole 0.5–2 cm long, with reference to the narcotic effects of some Solanum or without prickles. Inflorescence a few (1–4)- species. The species name, elaeagnifolium, is flowered raceme at first terminal, soon lateral; Latin for ‘leaves like Elaeagnus’, in reference peduncle 0.5–1 cm long; floral rachis 2–3 cm to olive-like shrubs in the family Elaeagnaceae. long; pedicels 1 cm long at anthesis, reflexed ‘Silverleaf’ refers to the silvery appearance of and lengthened to 2–3 cm long in fruit. Calyx the leaves and ‘nightshade’ is derived from the c. 1 cm long at anthesis; tube 5 mm long, more Anglo-Saxon name for nightshades, ‘nihtscada’ or less 5-ribbed by nerves of 5 subulate lobes, (Parsons and Cuthbertson 1992). Other vernacu- whole enlarging in fruit. Corolla 2–3 cm diam- lar names are meloncillo del campo, tomatillo, eter, rotate-stellate, often reflexed, blue, rarely white horsenettle, bullnettle, silver-leaf horsenet- pale blue, white, deep purple, or pinkish. Anthers tle, tomato weed, sand brier, trompillo, melon- 5–8 mm long, slender, tapered towards apex, cillo, revienta caballo, silver-leaf nettle, purple yellow, conspicuous, erect, not coherent; fila- nightshade, white-weed, western horsenettle, ments 3–4 mm long. Ovary pubescent towards desert night-shade, silverleaf bitter apple and summit; style 10–15 mm long. Fruit 8–14 mm devilbush (Boyd et al. 1984). In South Africa the diameter, globular, first marbled green, later plant is known by the Afrikaans name ‘Satans- greenish-yellow to orange brown, usually firm, bos’ (Satan’s bush), in testimony to its infamy not succulent. Seeds 3 × 2 mm diameter, flat or (Wassermann et al. 1988), and in Morocco it is biconvex, light brown, smooth’. known as morelle jaune (Bouhache, Boulet and The chromosome number in Australian mate- El Karakhi 1993). rial examined by Randell and Symon (1976) was n = 12. A flowering and fruiting stem is shown in Figures 1 and 2. Description There is morphological variability within Australian populations for degree of spininess, The following description is from Symon growth habit, petal colour and leaf shape, size (1981). and lobing, but the variation is considered to be ‘An erect, clonal, herbaceous perennial to within the range of the species. The variability 1 m, often 40–60 cm high, extensive under- is probably the result of multiple introductions, ground root system producing usually annual rather than hybridization with related indigenous vegetative growth; stems erect, branching to- species (Tideman 1960a, Leys and Cuthbert- wards top; prickles 2–5 mm long, straight, fine, son 1977). The large genetic diversity observed often reddish, usually present on stems, less in South Australian populations (Hawker et al. often on petioles and leaves, plants sometimes 2006) suggests multiple importations. nearly free of prickles; all parts covered with Silverleaf nightshade is sometimes confused close, dense, tomentum of stellate hairs (sessile with two native Solanum species in Australia, or shortly multiseriate-stalked, porrect-stellate native quena (S. esuriale Lindl.) and western with medium or long central ray), general aspect nightshade (S. coactiliferum J.M.Black). Silver- silvery-green, rarely rusty, slightly discolourous. leaf nightshade has a taller, more robust habit, 274 Solanum elaeagnifolium Figure 1. Flowering and fruiting stem of Solanum elaeagnifolium. Figure 2. Flowering shoots of Solanum elaeagnifolium growing from perennial rootstock in cereal stubble. 275 The Biology of Australian Weeds and longer leaves (10 cm cf. 5 cm) than S. esu- increasing in New South Wales and by 1978 riale, with more wavy margins (Cuthbertson there were at least 20 000 ha infested (J. Dick- et al.1976, McKenzie 1976a). S. coactiliferum enson personal communication). The weed was grows in sandy soils as a relic of native vegeta- of little importance until 1960 when a series of tion and is not normally an aggressive weed (D.E. wet summers accelerated spread (Cuthbertson Symon personal communication). S. karsensis et al. 1976). It was declared a noxious weed in (Symon), a native perennial that infests irrigated Western Australia in 1973 (Rutherford 1978) crops in far western New South Wales, is also and by 1978 it covered 150 ha, although only 17 similar in appearance and behaviour to silverleaf ha of this area was densely infested. It arrived nightshade (Monaghan and Brownlee 1981). in Western Australia before 1921, probably in Sudan grass (Sorghum sudanense (Piper) Stapf) from eastern Australia (P.A. Rutherford personal History communication). Silverleaf nightshade was first reported in Aus- tralia at Bingara (New South Wales) in 1901, but Distribution the route of introduction is not known. Rapid subsequent records at Tenterfield (1907), North Wapshere (1988) concluded that there is strong Melbourne (1909), Singleton (1914), Hopetoun evidence that silverleaf nightshade evolved in the (1918) and Cowra (1923), strongly suggest that Monterrey region in north-eastern Mexico, based multiple introductions occurred (Cuthbertson on an assessment of the variation, distribution et al. 1976). and frequency of its naturally occurring her- The weed was first recorded in South Australia bivores. Boyd et al. (1984) agree that silverleaf in 1914 (Kloot 1986), possibly in contaminated nightshade is native to the Americas, but believe hay from the USA (Parsons and Cuthbertson that it could be indigenous to either North or 1992), and was recognized as a potentially seri- South America. They do, however, concede that ous weed by the late 1940s. Unofficial reports the likely centre of origin is in south-western suggest that it has been present in the mid- United States and northern Mexico. Many of the northern areas of South Australia since 1937. regions of the world where silverleaf nightshade By 1958 it had been recorded from Lameroo, has established have similar climates to this puta- Keith, Owen, Clare, Hilltown, Rhynie, Cleve, tive area of origin. Roseworthy, Reynella and in the Upper Murray Silverleaf nightshade spread from the Ameri- Irrigation Area. All infestations were thought to cas to many places, including Australia, Argenti- be S. esuriale until 1958, when it was realized na, Brazil, Chile, India, Israel, Greece, Morocco, that silverleaf nightshade was also present. The North America, South Africa and Spain. It has common name ‘tomato weed’ was used to distin- become a major weed problem in Australia, Ar- guish silverleaf nightshade from native Solanum gentina, Greece, India, Morocco, North America species, commonly known as ‘wild tomatoes’, and South Africa (Carretero 1989, Holm et al. because farmers were reluctant to change to the 1991, Parsons and Cuthbertson 1992, Elefthero- name ‘silverleaf nightshade’ (Tideman 1960a,b). horinos et al. 1993). There are 1.4 million ha Sometime later the name ‘silverleaf nightshade’ of land infested with silverleaf nightshade in was adopted as the official common name for the the southern high plains of Texas alone, in- species in South Australia. By 1978, South Aus- cluding 800 000 ha of cotton (Abernathy and tralia had about 16 000 ha (J. Dickenson personal Keeling 1979, Keeling and Abernathy 1985). communication) and by 1990 the area exceeded Over 100 000 ha of irrigated cotton, maize and 40 000 ha (South Australian Animal and Plant sesame are infested in central Morocco (Tanji et Control Commission survey, unpublished). al. 1984). Silverleaf nightshade was first found Silverleaf nightshade was first declared under in South Africa as early as 1905 as a contami- noxious weed legislation in Victoria in 1950 nant of seed, but was only officially recorded in (McKenzie 1980) and by 1973 the State had an 1952 and was declared a noxious weed in 1966. estimated 1000 ha, with 90% occurring on six It is now a major weed and infests up to 55% of farms (Parsons 1973). Infestations were also land in some districts, occurring mainly in the 276 Solanum elaeagnifolium Northern and Northwest provinces, Free State around the world. It grows in the warm, temper- and the Karoo region of the Eastern Cape (Olck- ate regions of Australia with an annual rainfall of ers and Zimmermann 1991, Wassermann et al. 250–600 mm, and grows in a range of soil tex- 1988). It is widespread on the semi-arid pampas tures (Parsons and Cuthbertson 1992), although of South America, but not where crops and pas- the heaviest infestations occur on sandy soils tures provide adequate competition (McKenzie with low organic matter (Leys and Cuthbertson 1980). Potential for invasion of New Zealand 1977). For example, in the Wimmera and north- is low and a marginally suitable homoclimatic ern regions of Victoria it grows on heavy clays area exists only around the Hawkes Bay region but is most abundant on the light-textured soils (Panetta and Mitchell 1991). of the Mallee. The largest infestations are on Silverleaf nightshade occurs in the Australian cropping and grazing land, with smaller infesta- states of Queensland, New South Wales, Victoria, tions being found in irrigated pastures, orchards South Australia and Western Australia. It is a se- and vineyards, roadsides, channel banks and rious weed in South Australia, New South Wales stockyards (McKenzie 1980). In a study of the and Victoria, with large infestations occurring potential invasiveness of silverleaf nightshade throughout the cereal cropping zones. Isolated in New Zealand, Panetta and Mitchell (1991) infestations occur in Queensland and Western identified cool summers and high annual rainfall Australia (Figure 3). It infests large areas of as important factors which may limit its distri- the southern and central wheat zone, the north- bution in some regions of Australia which have western slopes, and the Murrumbidgee Irriga- not been colonized.
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