Aristolochia grandiflora (pelican flower)
Aristolochia grandiflora in the Princess of Wales Conservatory at Kew Gardens
Aristolochia grandiflora Sw.
Not evaluated according to IUCN Red List criteria.
Tropical forests, thickets, near streams and gullies.
Ornamental, traditional medicine, food plant of tropical swallowtail butterflies.
Poisonous to humans and livestock.
About this species
There are around 120 species of Aristolochia from the tropics and subtropics, most of which are woody vines or herbaceous perennials with heart-shaped leaves.
The extraordinary Aristolochia grandiflora, named in 1788 by Olof Swartz (1760-1818), has one of the largest flowers of any New World species and deserves its name ‘grandiflora’ (large flower). Each trumpet-shaped flower lasts for two days. On the first day it is in the female phase, attracting flies by its foul smell, similar to that of rotting meat. The flies are trapped by the downward facing hairs in the pouch of the flower to ensure pollination. On the next day, the flower changes to male phase and pollen is deposited on the pollinators, the odour disappears, the hairs wither and the insects are released.
Aristolochia grandiflora is cultivated as an ornamental. This and other species of Aristolochia are also grown as food plants for tropical swallowtail butterflies. Extracts of the whole plant are used by traditional healers in Colombia to treat snake bites. It is also used as an antibiotic.
Aristolochia gigas Lindl. (Full list of synonyms available on The Plant List)
Geography and distribution
Aristolochia grandiflora occurs naturally in the lowlands of southern Mexico to Panama and on Jamaica. It has been introduced elsewhere, including the southern United States as a food plant for swallowtail butterflies. It has also become naturalised in parts of Western Australia.
Aristolochia grandiflora is a large, herbaceous climber with stems reaching 10 m or more. The leaves are broadly cordate (heart-shaped), smooth or downy. The flowers are tubular, ending in a wide heart-shaped mouth 10–20 cm across, with the point extended into a long tail up to 60 cm long. The flower is white, veined with brownish purple, but darker in the throat. It opens at dawn and gives off a foul smell that attracts pollinators, mostly flies and hornets. The flowers close again at dusk.
Illustration from Curtis's Botanical Magazine
Curtis’s Botanical Magazine (Editor: Martyn Rix) provides an international forum of particular interest to botanists and horticulturists, plant ecologists and those with a special interest in botanical illustration.
Now well over 200 years old, the Magazine is the longest running botanical periodical featuring colour illustrations of plants. Each four-part volume contains 24 plant portraits reproduced from watercolour originals by leading international botanical artists. Detailed but accessible articles combine horticultural and botanical information, history, conservation and economic uses of the plants described.
Published for the Royal Botanic Gardens, Kew by Wiley-Blackwell Publishing.
This species at Kew
Kew’s specimen of the pelican flower in the Princess of Wales Conservatory produces enormous flowers. After heavy pruning in 2009, it flowered non-stop for five months.
Alcohol-preserved specimens of Aristolochia grandiflora are held in Kew’s Herbarium, where they are available to researchers from around the world, by appointment.
Kew’s Economic Botany Collection includes samples of the roots and fruits of Aristolochia grandiflora.
The fruits were sent to Kew by William Bancroft Espeut from Jamaica, following a letter to Joseph Hooker where Bancroft Espeut described Aristolochia grandiflora as ‘one of the most voracious insect destroyers’.
The samples are available to researchers from around the world, by appointment.
Adams, C. D. (1972). Flowering Plants of Jamaica. University of the West Indies, Mona, Jamaica.
Aguilar, M. I., Espejo, O. & Camacho, D. (1992). Chemical constituents of Aristolochia grandiflora. Fitoterapia 63: 275.
Brummitt, R. K. & Powell, C.E. (1996). Authors of Plant Names. Royal Botanic Gardens, Kew.
Burgess, K. S., Singfield, J., Melendez, V. & Kevan, P.G. (2004). Pollination biology of Aristolochia grandiflora (Aristolochiaceae) in Veracruz, Mexico. Annals of the Missouri Botanical Garden 91: 346-356.
Herklots, G. (1976). Flowering Tropical Climbers. Dawson, Folkestone, & Science History Publications, New York.
Otero, R., Núñez, V., Barona, J. et al. (2000). Snakebites and ethnobotany in the northwest region of Colombia. Part III: Neutralization of the haemorrhagic effect of Bothrops atrox venom. Journal of Ethnopharmacology 73: 233-241.
The Plant List (2010). Aristolochia grandiflora. Available online (accessed 23 August 2011).
Kew Science Editor: Martyn Rix
Kew contributors: Steve Davis (Sustainable Uses Group)
Copyediting: Malin Rivers
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