*University of Delhi, Delhi-7.
Department of Botany, Aligarh Muslim University, Aligarh
The naturally occurring populations of T. terrestris have been classified into two distinct categories on the basis of morphological differences. On cytological analysis it has been found that the small flowered forms are tetraploids (4x=48) and large flowered types are triploids (3x=36). The significant morphological differences between tetraploids and triploids and their failure to hybridize indicate that they are probably unrelated. A probable relationship of triploid and tetraploid races of T. terrestris to T. cistoides and T. alatus respectively has been suggested.
