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Paphiopedilum
The sides of the pitcher are slippery and may be grooved in such a way so as to ensure that the insects cannot climb out. The small bodies of liquid contained within the pitcher traps are called phytotelmata. They drown the insect, and the body of it is gradually dissolved.
Pitcher plants are signs that the soil is lacking in nutrients. These plants modify their leaves into pitchers to trap more food.
Taken on a walk around lower Pierce Reservoir, I think these had actually be planted for people's enjoyment, there where lots of different types of these Pitcher plants all together. There was also a sign leading me to them. So my guess is they are not completely wild.
Thanks Sean, that makes perfect sense. Edward & Monkey-Mind are right though, this is not a Pitcher Plant at all but a Slipper Orchid.
Craig, I think these had actually be planted for people's enjoyment, there where lots of different types of these Pitcher plants all together. There was also a sign leading me to them. So my guess is they are not completely wild. The reservoir is pretty flat but surrounded by a lot of forestry. Thanks for the help. :)
This is a Paphiopedilum, similar to P.glaucophyllum but need to check other similar species. Is the Pierce Resevoir landscaped and cultivated? Very strange to see something like this wild in Singapore and as far as I'm aware there were never any Paph's native.
hm, sean, I think this is some kind of lady slipper orchid, not a pitcher plant...