(1928)  
 
The fifth tetraploid variety is a garden form of the wild diploid species EE, R. macrophylla Lindl. (em.) having the specific characters of the E septet of chromosomes and the septet formula EEEE: this form belongs to the typical R. macrophylla Lindl. and according to Regel (1877) was found in gardens at Khiva by Korolkowi: there is a plant of this at Kew named R. macrophylla var Korolkowi and another at Cambridge (from Albury) and my material has been obtained from both these plants.