Romaine lettuce
Cos is not a pear. It is a type of lettuce, also called romaine lettuce.
It's a variety of lettuce (Romaine lettuce).
Cos.
98p at Somerfields.
To our knowledge, cos or romaine lettuce has not been transgenically modified as of August 2014.
The noun lettuce has varied usage in the plural. Traditionally the usage is "three heads of lettuce", but the alternative "three lettuces" has become very common during the last century. The collective noun is always "I like lettuce" or "this farmer grows lettuce".
Ceasar Salad, yum yum!!
Lettuce has a fairly long tap root for a reasonably low growing plant. This is because it requires planty moisture to remain turgid.
iceburg lettuce grows best although it is not the best kind of lettuce for your health but it grows the best
water lettuce
Iceberg lettuce is quite delicious.
The scientific name for lettuce is Lactuca sativa the family name is Asteraceae