Ahmad Aryavand - Department of Biology, University of Isfahan, Isfahan, Iran.

The chromosome numbers of four taxa of the Cuscuta L. from Isfahan area (Iran) are presented. The morphologic and cytologic differences between the two closely related species (C. campestris Yunck. and C. chinensis Lam.) are discussed, and the chromosome numbers of C. chinensis (۲n=۲۸), and the tetraploid race of C. planiflora Ten. var. sicula (Ten. ex Engelm.) Trab. (۲n=۲۸) is being reported for the first time. The differences between the variety C. planiflora Ten. var. sicula (Ten. ex Engelm.) Trab. with the typical variety are discussed. The other counts, of C. campestris (۲n=۵۶), and C. monogyna (۲n=۲۸) agree with earlier findings. Also, the basic chromosome number of the genus Cuscuta L. is briefly discussed.

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