- "Solanum dregei" and "Solanum subhastatum" redirect here. These taxa can also refer to other species; see below for details.
Solanum aculeastrum is commonly known as Soda Apple, Sodaapple Nightshade, Goat Apple, Poison Apple, or more ambiguously as "bitter-apple". It is a poisonous nightshade species from Africa and not related to true apples. The term "soda apple" probably derives from "sodom apple", modified due to the fruit's detergent properties.
It is a shrub or small tree native to tropical Africa south to South Africa, in a wide range of soil, terrain and climatic conditions. It is highly branched and reaches 1–5 m high, with numerous sharp hooked brown thorns. The leaves are ovate, up to 15 cm long and 13 cm broad, with lobed margins and a downy underside. It flowers (in South Africa) from September to July, peaking from November to March. The petals are white to pale violet surrounding the ovary, the flower also has a bitter, sour smell. These yield to fruit from April to January, peaking in June and November. These smooth, round berries are 6 cm in diameter and fade from green to yellow as they ripen. These berries contain high levels of the poisonous alkaloid solanine. The species name aculeastrum refers to the thorns that adorn most parts of the shrub.
Because of its dense growth and prickly nature, goat-apple is used as a hedge and living barrier for containing livestock. The Soda Apple is often used as a soap replacement, as it is high in saponin. Traditional Zulu practices use the fruit - fresh, boiled, or charred - in herbal medicine to treat a wide variety of afflictions including cancer, toothaches, and ringworm.
- Solanum albifolium C.H.Wright
- Solanum conraui Dammer
- Solanum dregei C.Presl
- Solanum horridissimum Hort. Par. ex Sendtn. (nomen nudum)
- Solanum protodasypogon Bitter
- Solanum rugulosum De Wild.
- Solanum saponaceum Welw. (non Dunal: preoccupied)
- The Solanum saponaceum described by W.J. Hooker is the S. elaeagnifolium of Cavanilles.
- Solanum saponaceum var. uruguense, described by Grisebach, is now S. bonariense.
- Solanum sepiaceum Dammer
- Solanum subhastatum De Wild.
- Solanum subhastatum as described by L.B. Smith and Downs is now S. cylindricum.
- Solanum spectabile var. subhastatum as described by Otto Sendtner in von Martius is the S. affine of Sendtner.
- Solanum thomsonii C.H.Wright
- Solanum aculeastrum ssp. pachychlamys Bitter
- Solanum aculeastrum ssp. sepiaceum (Dammer) Bitter
- Solanum aculeastrum var. albifolium (C.H.Wright) Bitter
- Solanum aculeastrum var. conraui (Dammer) Bitter
- Solanum aculeastrum var. exarmatum Bitter
- Solanum aculeastrum var. parceaculeastrum Bitter
- Solanaceae Source 
- Solanaceae Source : Solanum aculeastrum. Retrieved 2008-SEP-25.
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- Plantzafrica information
- Wanyonyi A.W.; Tarus P.K.; Chhabra S.C. (2003). "A novel glycosidic steroidal alkaloid from Solanum aculeastrum". Bulletin of the Chemical Society of Ethiopia 17 (1): 61–6.
- Wanyonyi AW, Chhabra SC, Mkoji G, Njue W, Tarus PK (April 2003). "Molluscicidal and antimicrobial activity of Solanum aculeastrum". Fitoterapia 74 (3): 298–301. doi:10.1016/S0367-326X(03)00030-3. PMID 12727499.
- Solanum aculeastrum Dunal on Solanaceae Source — Specimens and a full list of scientific synonyms previously used to refer to Solanum aculeastrum Dunal. Full descriptions, images and identification keys coming soon!