This is a beautiful flower, indigenous to the northern temperate zones and rare in the southern lands. Its design is also used as a slave brand and "dina" is sometimes used as a slave name. It is also known as the "slave flower" though the exact derivation of that appelation is unknown. There is a legend that an ancient Ubar of Ar captured the daughter of a fleeing enemy in a field of dinas. He enslaved her there, looked upon the lush field and called her Dina. It is also said that it may be be called "slave flower" because "... It is, though delicate and beautiful, a reasonably common, unimportant flower; it is also easily plucked, being defenseless, and can be easily crushed, overwhelmed and, if one wishes, discarded."

                                                                                       (Slave Girl of Gor, p.62)

The reason, in the north, that the dina is called the slave flower has been lost in antiquity. One story is that an ancient Ubar of Ar, capturing the daughter of a fleeing, defeated enemy in a field of dinas there enslaved her, stripping her by the sword, ravishing her and putting chains upon her. As he chained her collar to his stirrup, he is said to have looked about the field, and then named her ‘Dina.’ But perhaps the dina is spoken of as the slave flower merely because, in the north, it is, though delicate and beautiful, a reasonably common, unimportant flower; it is also easily plucked, being defenseless, and can be easily crushed, overwhelmed and , if one wishes, discarded.
Slave Girl of Gor- 62