Araujia sericifera

The genus name (Araujia) derives from António de Araújo e Azevedo, 1st Count of Barca (1754–1817), a Portuguese amateur botanist who conducted scientific studies and experiments in his own botanical garden. The species' Latin name sericifera means "silk-bearing" and refers to the silky hairs surrounding the seeds inside the fruits. Araujia sericofera is an incorrect taxonomic synonym for Araujia sericifera.[4][5][6]

Closeup of flowers

As an ornamental plant

Araujia sericifera is a creeping vine that can climb up to 5–10 metres (16–33 ft) high. When broken it releases a milky, smelly exudate. Leaves are opposite, dark green, glossy and quite fleshy, almost triangular, with entire margins, about 10–12 centimetres (3.9–4.7 in) long and 1–6 centimetres (0.39–2.36 in) wide with an intact leaf margin. The upper side is dark green, bare and shiny, the underside is grey-green with felt-like hairs. When a stem, leaf or unripe fruit is broken, a white milky juice is produced at the breaking point. It is slightly toxic and can cause an allergic skin reaction when touched.

The stems are thin and right-winding. They branch strongly and can lignify at the base. The plant usually wraps itself around other plants or around a post or the bars of a fence. The root system consists of a short taproot with superficial lateral roots. The plant's stems and leaves may senesce in late summer or early autumn, but new shoots will grow on the old stems as climbing support.

Insect trap

The structure of the flower includes a number of wedge-shaped openings that function as an insect trap (hence its English name of "cruel plant"), without being a carnivorous plant, where it occasionally and inadvertently traps the pollinator's proboscis, leading to its death. When the foragers put their tongue in the flower, it is blocked by hooks and only the most robust insects manage to free themselves. The insects can die in the flower if the captivity lasts too long. The hummingbird hawk-moth, monarch butterfly, and some bees are often victims of this plant.

Moth's proboscis becomes caught within the flower's rigid anther wings.

Trapped, the moth frantically struggles to free itself.

The plant is native to South America: Peru mainly, but also Argentina and Brazil.

It was introduced to Europe and other areas as an ornamental plant, but it is now considered a noxious weed. This plant is now widely distributed in France by horticultural networks as a climbing and scent plant. It is established in rather rich, sunny soil (possibly in partial shade). It will only be perennial when protected from frost.

Nowadays its geographical distribution includes southern Europe, South Africa, North America (California, Georgia), South America (Argentina, Brazil, Paraguay, Uruguay), Australia, and New Zealand.[7][8]

These plants grow in wastelands with trees and hedges, in forests and in rocky places or cliffs. They prefer sunny or partially shady places, at an altitude of 0–1,800 metres (0–5,906 ft) above sea level.

The fast-growing vines can cover a tree canopy in two or three years, competing with the tree for light, water, and nutrients. They damage trees by this competition and by twining so tightly around their branches that it girdles them.[9]

The plant can be used as an alternative food source for caterpillars of the monarch butterfly.[10][11] Although monarch caterpillars are not known to occur naturally on the plant, they will readily feed on leaves when supplies of Gomphocarpus physocarpus (swan plant) have run out.[12]

Moth Plant is toxic for some people. Skin contact with its sap can cause rashes. Contact with the eyes, in particular, can cause severe discomfort.

• 
  Pink flower
• 
  Close-up of a flower, lateral view
• 
  White flower
• 
  Bud
• 
  Fruit
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  Leaf
• 
  Habit
• 
  Inside fruit

• Pink, A. (2004). Gardening for the Million. Project Gutenberg Literary Archive Foundation.
• Clarification of Synonymy for the Common Moth-Vine Araujia sericifera (Asclepiadaceae)
• Syst. veg. 6:120. 1820 (R. Brown, Asclepiadeae 41. 1810; Mem. Wern. Nat. Hist. Soc. 1:52. 1811, nom. inval.)
• Tutin TG, Heywood VH, Burges NA, Moore DM, Valentine DH, Walters SM and Webb DA (1964/80) Flora Europeaea, Vol 1–5. Cambridge University Press, Cambridge (GB).

Wikispecies has information related to Araujia sericifera.

Wikimedia Commons has media related to Araujia sericifera.

• Araujia sericifera, European and Mediterranean Plant Protection Organization
• Araujia sericifera Brot., BioLib
• Araujia sericifera, Jepson eFlora, University of California, Berkeley
• Araujia sericifera Brot., PLANTS database, Natural Resources Conservation Service, USDA
• Photographs, CalPhotos, University of California, Berkeley
• Araujia sericifera, photograph gallery, Natura Italiana