C. 'Britannia' is often mislabeled as C. 'Roma' or C. 'Italia,' but although similar, they ARE different.

'Italia': Introduced by C. Sprenger, Dammann & Co., Naples, Italy, in 1894.
'Roma': Info shows earliest reference to this specimen is Revue Horticole in 1895. Has also been called C. Florence Vaughn, C. Golden Eagle, C. Heinrich Seidel, C. Jennifer, C. Orange King Humbert, C. Papillon, C. Tropicluster.
'Britannia': also introduced by K. Sprenger, Dammann & Co., Naples, Italy, date unknown.

If you need more info, drop me a note and I'll list foliage variations, tillering, and clumping habits, all of which are different.

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