Hi Jools
Wanting something to grow that quickly would seem to indicate Russian Vine, but like yourself I do not know what it is called in Spanish or even if it is available in Spain.  I cannot say that I have ever partiuclarly noticed it around.  As for other plants well my knowledge is not that good as to what is an extremely fast grower.
May I suggest that you join the Iberian Nature Forum www.iberianatureforum.com and pose your question on the plants section.  I am sure that there is someone on there who will be able to come up with an answer for you.  It is also an extremely interesting forum to belong to if you have any queries about what is growing, walking, swimming or flying around you here in Spain.
Good Luck
Tony