Cattleya harrisoniana  Cattleya harrisoniana ("Harrison's Cattley's orchid") is a bifoliate "Cattleya" species of orchid. The diploid chromosome number of "C. harrisoniana" has been determined as 2"n" = 40. The haploid chromosome number of "C. harrisoniana" has been determined as "n" = 20. A comparison between "C. harrisoniana" and "C. loddigesii"