Vallisneria tortifolia or vallisneria corkscrew or corkscrew grass, different names for the same plant basically.
According to websites I have read, the vallisneria torti will grow up to 25 cm. It is the smallest of the vallisneria type plants.
fish guy
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Corkscrew val grows to 3 feet tall, way too tall for a 2.5. You can trim it, but it will look like crap.
If you really want it though, 1-2 inches is fine, rooted plants grow better in gravel though. Snad packs tight and the plant has trouble pushing roots through it. Gravel has spaces for roots to slip in between.
According to my personal experience and the experience of everyone I know hwo has it, it grow to 3 feet.
Doesn't get as tall as I said? If I had a camera I would snap a pic for you right now. It IS corkscrew val and it IS 28 inches tall.
Anonymous
I have not personally Vallisneria Torti but I'm a book nerd and have read a lot about it. I would put 2" or 3" in and see what happens.
Ashie
Put about 1 inch of gravel or sand in the bottom. This type of corkscrew doesn't get as tall as the other guy said. Your size tank will be fine. Here's some other info. Good Luck!
http://www.aqua-fish.net/show.php?what=plant&cur_lang=2&id=3