CHROMOSOME NUMBERS AND TAXONOMIC NOTES ON NORTHERN GRASSES: III. TWENTY-FIVE GENERA

Abstract

Chromosome numbers and voucher specimens are recorded for some collections of 25 genera of grasses, mainly collected in Canada. The somatic chromosome numbers of the following are recorded: (1) Agrostis borealis, 2n = 56; A. canina, 2n = 14; A. gigantea, 2n = 42; A. palustris, 2n = 30; A. perennans, 2n = 42; A. scabra, 2n = 42; and A. tenuis, 2n = 28; 32; and 34. (2) Alopecurus acqualis, 2n = 14; A. alpinus, 2n = 105; 112; and 119; A. geniculatus, 2n = 28; A. occidentalis, 2n = 112; and A. pratensis, 2n = 28. (3) Ammophila breviligulata, 2n = 28. (4) Anthoxanthum odoratum, 2n = 20. (5) Calamagrostis canadensis, 2n = 42; and 56; C. inexpansa, 2n = 70; C. lapponica, 2n = 28; 32; 42; ca. 91; 98; and 140; C. neglecta, 2n = 28; C. pickeringii, 2n = 28; C. purpurascens, 2n = 28; 42; and 84; and Calamagrostis sp.?, putative hybrid, 2n = 49. (6) Cinna arundinacea, 2n = 28; and Cinna latifolia, 2n = 28. (7) Danlhonia compressa, 2n = 36; and D. spicata, 2n = 36. (8) Deschampsia brevifolia, 2n = 26; D. caespitosa, 2n = 26; 27; and 28; D. elongata, 2n = 26; D. flexuosa, 2n = 28; and 32; and D. pumila, 2n = ca. 39. (9) Hierochloë alpina, 2n = 56; and H. odorata, 2n = 56. (10) Koeleria cristata, 2n = 14. (11) Leersia virginica, 2n = ca. 48. (12) Milium effusum, 2n = 28. (13) Muhlenbergia squarrosa, 2n = 40; and M. uniflora, 2n = ca. 42. (14) Nardus stricta, 2n = 30. (15) Oryzopsis asperifolia, 2n = 48; O. pungens, 2n = 24; and O. racemosa, 2n = 48. (16) Panicum xanthophysum, 2n = 36. (17) Phalaris arundinacea, 2n = 28. (18) Phleum alpinum, 2n = 28; and Phleum pratense, 2n = 42. (19) Sieglingia decumbens, 2n = 36. (20) Sorghastrum nutans, 2n = 40. (21) Spartina gracilis, 2n = 42. (22) Sphenopholis intermedia, 2n = 14. (23) Sporobolus cryptandrus, 2n = 36. (24) Stipa comata, 2n = 44. (25) Trisetum flavescens, 2n = 28; T. molle, 2n = 42; and T. spicalum, 2n = 28.