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Cryptostegia grandiflora
''Cryptostegia grandiflora'', commonly known as rubber vine, is a woody-perennial vine that is native to south-west Madagascar. It is also a significant weed in northern Australia, sometimes regarded as the worst weed in all of Australia. It has also been introduced to most other tropical and subtropical regions by man, because of its attractive flowers and the fact that its latex contains commercial quality rubber (hence the name). It is now naturalised in the Caribbean, East Africa, Mauritius, India, Southeast Asia, Indonesia, Latin America, the southern United States, Fiji and New Caledonia.
Seeds germinate after the first rains of the wet season, but growth does not become rapid until well after the wet season begins. However, if enough water is available, rubber vine can grow as much as five metres in one month. Flowering usually occurs after the wet season ends, along with fruit set. It is usual to find both mature and immature fruit on rubber vine at any one time.
Rubber vine seeds are dispersed by winds and flooding. This is particularly important in Australia where very large river floods can occur.
==Description==
A rubber vine can grow up to 2 metres (m) tall as a shrub, but when it is supported on other vegetation as a vine, it can reach up to 30 metres in length. Rubber vine prefers areas where annual rainfall is between 400 and 1400 millimetres (mm), and is well adapted to a monsoonal climate. It can grow maximally on an annual rainfall of 1700 millimetres, but seeds best with an annual rainfall of 400 millimetres or less. For this reason, rubber vine thrives on (and requires) the extreme variability of rainfall and streamflow characteristic of central Queensland. The extreme variability (''four times'' that of other countries to which it has been introduced) is almost certainly why rubber vine has become a major weed in Australia and not any other country in which it has been introduced.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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