Actually I have several PNG plant lists. One is from Dave Wilson on the RML (Rainbow Mailing List). Unfortunately a LOT of the plants are hard or impossible to get and those you can get are very pricey.
If you are thinking of buying some for the new tank and don't want to waste your money or invite a huge problem with algae, then the best thing to do is set the tank up and sock it full of "throw away" plants like hornwort (which is actually a PNG plant, so not really a throw-away), anacharis and the like. Then replace the plants with the ones you want, as you get them. Unless you REALLY luck out, it will take you 3-4 weeks to source the plants and get them in. I'm still battling aglae problems in my first tank which I set up and let run before I had all the plants in. Doh. Learn from your mistakes.`
Here's the list. Comments in brackets are Dave's, anything else are mine:
Acrostichum speciosum ( a very large fern but juveniles are ok in an aquarium) Unable to source
Ammania baccifera ( Needs really bright light) Unable to source
Aponogeton loriae Unable to source
Aponogeton womersleyi Unable to source
Blyxa aubertii ( a very nice aquarium plant ) aquabotanic.com
Blyxa japonica aquabotanic.com
Blyxa novoguineensis Unable to source
Blyxa octandra Unable to source
Ceratophyllum demersum (say no more) hornwort
Ceratopteris thalictroides (broad leaf variety similar to the one in North Aust.) Unable to source, substituting with thin leaf
Cryptiocorne dewitii Unable to source
Cryptocoryne ciliata ( A large crypt that likes to grow emergent) aquabotanic.com, Lowcoaster on AquaBid.com (Lowcoaster's are nicest)
Cryptocoryne versteegii ( I would like to get this one) Unable to source
Elatine triandra WANT BADLY, but unable to source
Hydrilla verticillata ( a bit weedy, chokes waterways) Unable to source
Hydrostemma motleyi (related to Barclaya) Unable to source
Lemna triscula (Duckweed) Anywhere
Limnophila aromatica (Useable) Several places carry this
Limnophila brownii (A very nice aquarium plant)
Microsorium brassii Narrow leaf java fern. VERY expensive. Lowcoaster has the best prices at 8$ per plant
Microsorium pteropus Java fern
Myriophyllum dicoccum ( a very nice aquarium plant, goes very red in sunlight) Unable to source, substitute with myriophyllum terenum
Myriophyllum pygmaeum Unable to source
Numphoides indica ( Like a banana lily) Haven't sourced
Nymphaea nouchali ( Very nice as a juvenile plant) Haven't sourced
Nymphaea pubescens (Very nice when young, related to tiger lotus) Haven't sourced
Nymphaea violaceae (nice as a juvenile plant, needs bright light) Haven't sourced
Ottelia alismoides (Beautiful plant that needs to be grown from seed each year, considered a weed outside Aust and New Guinea) Sourced, but wary. No mention of seeds. Did not buy.
Pogostemon stellatus (A very nice aquarium plant) Available from several places
Potamegeton javanicus (useable but not very attractive) Unable to source
Potameogeton malaianus Unable to source
Potameogeton pursillus Unable to source
Rotala mexicana, ( a very nice plant) Sourced, but source is out. May substitued with another red rotala
Scirpus litoralis ( has nice foliage on immature plant, once mature send up rigid spikes out of water) Unablet to source
Spirodela polyrhiza (Giant duck weed) Don't want
Vallisneria natans ( A very broad leaf vallisneria) Desperately looking for this one. I've seen it. I know it's out there.
Wolffia HAHAH, can't find that anywhere. Don't even know what it is
I have another list as well from Adrian's rainbowfish site and there are a lot of plants on there that Dave doesn't have on his list. It's for the Sepik River region. I'll post that one later today.
Roan