Any good collection in Yunnan, Thailand and along the Mekong?

[Shing Lam]

Hi,

A friend of mine is going to Yunnan, his itinery is like this:
Hong Kong -> Kunming -> Dali -> Lijiang -> Xishuangbanna ->
Mekong River -> Cambodia -> Thailand (Phuket).

He's into Arisaema and Amorphophallus.  Any tips and collection
data?

He's in Hong Kong now, applying for the visas.  He'll depart
once he's got the paperworks done, i.e. a few days from now.

Regards,

Shing Lam
Hong Kong