Solanum americanum, commonly known as American black nightshade,[3] small-flowered nightshade[4] or glossy nightshade, is a herbaceous flowering plant of wide though uncertain native range. The certain native range encompasses the tropics and subtropics of the Americas, Melanesia, New Guinea, and Australia.[5]

Solanum americanum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Solanales
Family:	Solanaceae
Genus:	Solanum
Species:	S. americanum
Binomial name
Solanum americanum Mill.
Synonyms[1][2]
Solanum adventitium Polgar Solanum amarantoides Dunal Solanum americanum var. nodiflorum (Jacq.) Edmonds Solanum caribaeum Dunal Solanum curtipes Bitter Solanum depilatum Bitter Solanum ganchouenense H. Lév. Solanum gollmeri Bitter Solanum humile Lam. Solanum imerinense Bitter Solanum inconspicuum Bitter Solanum indecorum Rich. Solanum inops Dunal Solanum minutibaccatum Bitter Solanum minutibaccatum var. curtipedunculatum Bitter Solanum nigrum L. Solanum nigrum var. americanum (Mill.) O.E. Schulz Solanum nigrum var. atriplicifolium G. Mey. Solanum nigrum var. minor Hook. f. Solanum nigrum var. nodiflorum (Jacq.) A. Gray Solanum nigrum var. pauciflorum Liou Solanum nigrum var. virginicum L. Solanum nodiflorum Jacq. Solanum nodiflorum var. acuminatum Dunal Solanum nodiflorum var. macrophyllum Dunal Solanum nodiflorum var. petiolastrum Dunal Solanum nodiflorum var. puberulum Dunal Solanum nodiflorum var. sapucayense Chodat Solanum oleraceum Dunal Solanum parviflorum Badarò Solanum photeinocarpum Nakam. & Odash. Solanum pterocaulon Dunal Solanum purpuratum Bitter Solanum quadrangulare Thunb. ex L. f. Solanum sciaphilum Bitter Solanum tenellum Bitter Solanum triangulare Lam.

The plant is widely naturalised around the tropical Pacific and Indian Oceans, including Hawaiʻi, Indochina, Madagascar and Africa, possibly via anthropogenic introduction in these locales.

Solanum americanum is one of the most widespread and morphologically variable species belonging to the section Solanum.[6] It can be confused with other black nightshade species in the Solanum nigrum complex.[7]

Description

Solanum americanum grows up to 1–1.5 metres (39–59 in) tall and is an annual or short-lived perennial. The leaves are alternate on the branch, and vary greatly in size, up to 10 centimetres (3.9 in) long and 7 centimetres (2.8 in) broad, with a 4-centimetre (1.6 in) petiole and a coarsely wavy or toothed margin. The flowers are about 1 cm diameter, white or occasionally light purple, with yellow stamens. The fruit is a shiny black berry 5–10 millimetres (0.20–0.39 in) diameter, containing numerous small seeds.

Taxonomy

Solanum americanum is a variable taxon. It is considered by some botanists to be more than one species, and others recognise subspecies.[5] Some botanists have suggested that Solanum americanum may be conspecific with the European nightshade, S. nigrum.[2]

Toxicity

Research indicates the presence of toxic glycoalkaloids and there are warnings to be careful on the use of S. americanum as herbal medicine and food.[7] The green fruit is particularly poisonous and eating unripe berries has caused the death of children.[8] Ripe berries and foliage may also cause poisoning,[8] though the toxicity seems to diminish somewhat with ripening.[9] This is via high levels of the glycoalkaloids, solanine and solamargine.[10] Other toxins present in the plant include chaconine, solasonine, solanigrine, gitogenin and traces of saponins,[11] as well as the tropane alkaloids scopolamine (hyoscine), atropine and hyoscyamine.[12]

Significant amounts of solasodine (0.65%) have been found in the green berries.[13] The ripe fruit also contains 0.3–0.45% solasonine,[13] and acetylcholine, and has a cholinesterase-inhibiting effect on human plasma.[11] In Transkei, rural people have a high incidence of esophageal cancer thought to be a result of using S. americanum as a food.[11] Livestock can also be poisoned by high nitrate levels in the leaves.[11]

Toxicity varies widely depending on the genetic strain and the location conditions, like soil and rainfall.[8][11] Poisonous plant experts advise: "...unless you are certain that the berries are from an edible strain, leave them alone."[14]

See also

• Sobemovirus

References

External links

• Missouri Plants
• Solanum americanum: Occurrence data from Global Biodiversity Information Facility
• "Solanum americanum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA).
• Pacific Island Ecosystems at Risk: Solanum americanum (very detailed description)
• Identifying nightshades as weeds
• Edmonds, Jennifer M.; Chweya, James A. (1997). Black Nightshades: Solanum Nigrum L. and Related Species. Promoting the conservation and use of underutilized and neglected crops. Vol. 15. Bioversity International. ISBN 978-92-9043-321-7.
• "Solanum americanum Mill". Solanaceae Source. — Images, specimens and a full list of scientific synonyms. Full descriptions and identification keys coming soon!
• Plants for a future
• Medina, Freddy R.; Ritchie, Lawrence S. (October–December 1980). "Molluscicidal Activity of the Puerto Rican Weed, Solanum nodiflorum, against Snail Hosts of Fasciola hepatica". Economic Botany. 34 (4): 368–375. doi:10.1007/bf02858313. JSTOR 4254217. S2CID 21001631.

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