PLATE 14 



Metaphases in root tips pre-treated with S-hydroxy-quinoline ( X 1500) 



(a) Helianthemum chamaecistus (2n = 20), 

 Hod Hill, Dorset 



(b) Tuherarm guttata (2n = 36), 

 Three Castles Head, Co. Cork. 



Metaphase II in pollen mother cells ( X 1500) : 



(c) Helianthemum canum (n — 11), 

 Poulsallagh, Co. Clare 



(d) Helianthemum alpestre {n 11) 

 Interlaken,, Switzerland 



