Cytological studies in the genus Medicago linn.

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Abstract
In the genus Medicago male meiosis was studied in 14 spp. and mitosis with the help of root tips was studied from 19 collections belonging to 15 spp. Most of the species were diploids having n = 7 or n = 8; only 2 spp. (M. sativa and M. scutellata) were tetraploids having n = 16. Chiasmata frequency per bivalent varied from 1.77 (M. tornata) to 2.18 (M. scutellata). Total chromatin length varied for 14.36 .mu. (M tuberculata) to 48.56 .mu. (M. sativa Coll. no. 1766). On the basis of karyotypes, species were classified according to the classification of Stebbins (1971). Only 4 of the 12 categories were represented by the species examined, indicating that the degree of asymmetry was low. Accessory chromosomes were recorded from root tip cells in 4 taxa belonging to 3 spp. (M. intertexta, M. littoralis and M. tornata). [The other species studied were M. arabica, M. coerulea, M. coronata, M. lupulina, M. murex, M. orbicularis, M. polymorpha, M. rigidula, m. rotata, M. truncatula and M. turbinata.].

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