Hi Amanthao,
Not sure it's a medicinal plant, but it looks like Sansaveria cylindrica.* Your plant may not have as much variegation as these.
http://www.suculentas.com.br/Suculen...ndrica_JPG.jpg
http://www.almostedenplants.com/shop...exd.asp?id=664
http://forum.garten-pur.de/attachments/Eris_Gurke.jpg
http://www.pungilandia.com/media/sans_cilin.jpg
Your plant may spread out if it gets more sun and more age.
Newt
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.