I have visited and commented on some links, and I can't seem to let it pass even if late, it is already Thursday now. The word 'Ephemeral' has now been used widely: noun or adjective, to denote short or fleeting existence, transience. But short existence is very arbitrary. I am familiar with it in Botany, to denote those plants which stay dormant underground and suddenly finish its growth and reproduction when conditions arise. Such conditions are not constant, and ephemeral plants seem to adapt to these fleeting moments. So there are spring ephemerals, desert ephemerals, and weed ephemerals. This botanical term exists only in temperate climates. Dictionaries provided wide ranges of definitions, maybe a good site for plants is here: http://en.wikipedia.org/wiki/Ephemeral_plant, or here for wider use: http://en.wikipedia.org/wiki/Ephemeral.
We don't have ephemeral plants because we don't have extreme seasons as you have. But we have a lot of plants which grow and reproduce only during the wet season and lay dormant during the rest of the year. However, the definition has transcended to mean a lot of things, transitory, and it is already accepted even to describe art, or human existence, depending on the time frame. So, I might as well use it with our conditions. For our sake, I will call it wet season ephemerals or "wet tropics ephemerals". I hope no authority on 'ephemerals' will sue me for using it very colloquially, for our own tropical use. They are normally called wet season plants, but to be more internationally sounding (and for W4W), I will call them such. What do you think? (These are all taken in our property).
The dew and grass