b 8 b are showing the heart without outer leaves the c figures 5 c 6 c 7 c 8 c are showing a longitudinal section of the heart the d figures 5 d 6 d 7 d 8 d are showing cut heart leaves the lettuce plants of the invention are completely red in the heart of the head whereas the other lettuce plants are not all plants are grown in aramon france in 2002 sown on 10 jan 2002 transplanted into a confidential open field on 15 feb 2002 harvested on 25 apr 2002 the lettuce of the invention was obtained according to the following pedigree in 1986 a cross was made between a plant of cv pippo rijk zwaan red coloured and a plant of cv blonde maraichere caillard green coloured in 1988 a red offspring plant from this cross was used as a father in a cross with a plant of cv gringo rijk zwaan red coloured in the same year a cross was made between a plant of cv pierrot rijk zwaan red coloured and a plant of cv roxette rijk zwaan green coloured in 1989 a red offspring plant from this cross was used as a father in a cross with a plant of cv krizet rijk zwaan green coloured in 1992 a red f3 offspring plant was selected from the krizet u00d7 pierrot u00d7 roxette cross mentioned above and it was used as a mother in a cross with a father plant which was a selected red offspring plant from the gringo u00d7 pippo u00d7 blonde.