Contribution to the chromosome atlas of the nepalese flora III

Chromosome numbers for 16 taxa within the families viz. Amaryllidaceae, Apiaceae, Asteraceae, Lamiaceae, Polygonaceae and Urticaceae from Nepal are reported here. Somatic or/and haploid chromosome counts of the taxa collected from central parts of the country have been recorded to be n=8, 2n=16 in Allium cepa L., 2n=16, 32 in Allium hyposistum Steam, 2n=32, 48+3B in A. tuberosum L. (Amaryllidaceae); 2n=22 in Apium graveolens L. (Apiaceae); 2n=32 in Artemisia indica Willd., 2n=18 in Conyza canadensis (L.) Cronquist, 2n=28 in Echinops niveus Wall ex Royle (Asteraceae); 2n=72 in Mentha piperita L., 2n=24 in Rosmarinus officinalis L. (Lamiaceae); n=11, 2n=22 in Aconogonum molle (D. Don) H. Hara var. molle and P. Perfoliata (L.) H. Gross, 2n=20 in Persicaria hydropiper (L.) Spach, 2n=22 in P. pubescens (Blume) Hara (Polygonaceae) and 2n=39 in Urtica dioca L. (Urticaceae) in the present research. Of these, the chromosome counts of Aconogonum molle var. molle, Allium tuberosum, Apium graveolens, Conyza canadensis, Mentha piperita, Rosmarinus officinalis are new records for Nepal. The number reported in Allium hyposistum, Echinops niveus and Persicaria pubescens in this research are perhaps the new reports. The counts for Aconogonum molle var. molle, Apium graveolens, Pericaria perfoliata, Urtica dioica in the present investigation confirmed to be different from the previously reported numbers for these taxa. The counts for Allium cepa, Apium graveolens, P. hydropiper, Mentha piperita, Rosmarinus officinalis tally with the previous reports.