From Word Reference: alfalfa /ælˈfælfə/ n<pre>
a leguminous plant, Medicago sativa, of Europe and Asia, having compound leaves with three leaflets and clusters of small purplish flowers. It is widely cultivated for forage and as a nitrogen fixer and used as a commercial source of chlorophyll Also called: lucerne</pre>
Etymology: 19th Century: from Spanish, from Arabic al-fasfasah, from al the + fasfasah the best sort of fodder
della is "of the" and can be "from the" dalla is "from the" and can be "by the" http://italian.about.com/library/fare/blfare153a.htm http://italian.about.com/library/fare/blfare125a.htm http://italian.about.com/library/fare/blfare114a.htm http://italian.about.com/od/grammar/a/italian-preposition-da.htm http://italian.about.com/od/grammar/a/italian-prepositions.htm
calle is a narrow street in Venice. callo is a callus or corn. cala is bay or (naut.) hold. cala! Come off it!. http://www.collinsdictionary.com/dictionary/italian-english/calare? calla is entrance. http://italian.about.com/library/anthology/dante/blpurgatorio009.htm
In English calla is a kind of lily.