SOME NEW CHROMOSOME NUMBERS IN THE CYPERACEAE^ 



By Elizabeth W. Davies 

 University College of Leicester 



A number of chromoscme counts have recently been made on some genera of the 

 Cyperaceae, including a number of several different species of Carex. These have all 

 been made on material of known origin, collected mostly from the British Isles, and 

 other parts of northern Europe, or grown in the Botanic Garden at the University College 

 of Leicester. Although the cytogenetics of this family and more especially the genus 

 Carex will be described elsewhere, it seemed worth recording the results here. 



A list of haploid chromosome numbers follows. 



Genus 



I. Eriophorum 

 II. Eleocharis 



III. Isolepis 



IV. Schoenus 

 V. Carex 



Subgenus I. Carex 

 Section 



1. Elatae Kiikenth. 



2. Distantes Lang. 



Species 



Haploid 

 chromosome 

 number 



3. Extensae Fr. 



E. angustifolium Honck. 29 

 E. quinqueflora (F. X. Hartm.) Schwarz 



(E. pauciflora (Lightf.) Link) 10 



E. multicaulis (Sm.) Sm. 10 



E. uniglumis (Link) Schult. 20 



I. setacea (L.) R. Br. {Scirpus setaceus L.) 13 



S. nigricans L. 22 



4. Longirostres Kiikenth. 



5. Rhomboidales Kiikenth 



6. GraciUimae Carey 



7. Pachystylae Kukenth. 



8. Paniceae Tuckerm. 



C. laevigata Sm. 

 C. hostiana DC. 



C. punctata Gaud. 

 C. distans L. 



C. hinervis Sm. 



C. flava L. 



C. extensa Good. 



C. lepidocarpa Tausch 



C. mairii Coss. & Germ. 



C. demissa Hornem. 



C. serotina Merat 



C. scandinavica E. W. Davies 



C. sylvatica Huds. 



C. depauperata With. 



C. strigosa Huds. 



C. pallescens L. 



C. filiformis L. (C. tomentosa aucl.) 

 C. panicea L. 



36 

 28 

 28 

 28 

 28 

 34 

 37 

 37 

 37 

 30 

 30 

 34 

 34 

 35 

 35 

 35 

 29 

 22 

 33 

 32 

 24 

 16 

 16 

 16 



Locality 



Teesdale, Durham 



Wicken Fen, Cambs. 

 Derby Fen, Norfolk 

 Holmsley Bog, Hants. 

 Derby Fen, Norfolk 

 Wittering Marsh, Northants. 



Windermere, Westmorland 

 Wittering Marsh, Northants. 

 Ben Lawers, Mid Perth 

 Ryvoan Pass, Inverness 

 Waulk Mill Bay, Orkney 

 Rhosneigr, Anglesey 

 St. Nectaire, France 

 Ireland 



Teesdale, Durham 

 see Watsonia, vol. 3, pt. 3, 1955 

 Rhosneigr, Anglesey 

 see Watsonia, vol. 3, pt. 3, 1955 

 see Watsonia, vol. 3, pt. 3, 1955 

 see Watsonia, vol. 3, pt. 3, 1955 

 see Watsonia, vol. 3, pt. 3, 1955 

 see Watsonia, vol. 3, pt. 3, 1955 

 Leigh Woods, Somerset 

 Axbridge, Somerset 

 Loddington Wood, Leics. 

 Leigh Woods, Somerset 

 Leigh Woods, Somerset 

 Teesdale, Durham 

 Shapwick, Somerset 

 Abisko, Sweden 



Pait of a thesis approved for the degree of Ph.D. by the University of London. 



242 



