Ipomoea purpurea, the common morning-glory, tall morning-glory, or purple morning glory, is a species in the genus Ipomoea, native to Mexico and Central America. Like all morning glories the plant entwines itself around structures, growing to a height of 2–3 metres (6 ft 7 in–9 ft 10 in) tall. The leaves are heart-shaped and the stems are covered with brown hairs. The flowers are trumpet-shaped, predominantly blue to purple or white, and 3–6 centimetres (1.2–2.4 in) diameter.
The plant is predisposed to moist and rich soil, but can be found growing in a wide array of soil types. It is naturalized throughout warm temperate and subtropical regions of the world. Although it is often considered a noxious weed, Ipomoea purpurea is also grown for its beautiful purple and white flowers and has many cultivars. Common cultivars include I. purpurea 'Crimson Rambler' (red-violet blossoms with white throats), 'Grandpa Ott's,' 'Kniola's Black Knight,' and 'Star of Yelta' (blossoms in varying shades of deep purple with white or pale pink throats) and 'Milky Way' (white blossoms with mauve accents).
Acylated cyanidin glycosides can be isolated from violet-blue flowers of I. purpurea. These anthocyanins were all based on cyanidin 3-sophoroside-5-glucoside, acylated with caffeic acid and/or p-coumaric acid.
Acylated pelargonidin glycosides can be isolated from the red-purple flowers of I. purpurea. The acylated anthocyanins were all based on pelargonidin 3-sophoroside-5-glucoside, acylated with caffeic acid and/or glucosylcaffeic acid.
Commercial morning glory seeds are commonly treated with toxic methylmercury which serves as a preservative and a cumulative neurotoxic poison that is considered useful by some to discourage recreational use of them. There is no legal requirement in the United States to disclose to buyers that seeds have been treated with a toxic heavy metal compound. According to the book Substances of Abuse, in addition to methylmercury, the seeds are commonly coated with a chemical that cannot be removed with washing that is designed to cause unpleasant physical symptoms such as nausea and abdominal pain. The book states that this chemical is also toxic.
Ipomoea purpurea in Loganville, Georgia
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- Norio Saito, Fumi Tatsuzawa, Kyoko Yoda, Masato Yokoi, Kichiji Kasahara, Shigeru Iida, Atsushi Shigihara and Toshio Honda (November 1995). "Acylated cyanidin glycosides in the violet-blue flowers of Ipomoea purpurea". Phytochemistry. 40 (4): 1283–1289. doi:10.1016/0031-9422(95)00369-I.CS1 maint: multiple names: authors list (link)
- Norio Saito; Fumi Tatsuzawa; Masato Yokoi; Kichiji Kasahara; Shigeru Iida; Atsushi Shigihara; Toshio Honda (December 1996). "Acylated pelargonidin glycosides in red-purple flowers of Ipomoea purpurea". Phytochemistry. 43 (6): 1365–1370. doi:10.1016/S0031-9422(96)00501-8.
- Dunn Chace, Teri (2015). Seeing Seeds: A Journey into the World of Seedheads, Pods, and Fruit. Portland OR: Timber Press. ISBN 1604694920.
- Potter, James (2008). Substances of Abuse. Redding CA: Jubilee Enterprises. p. 157. ISBN 1930327463.
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