A BIOSYSTEMA TIC STUDY OF SOME GLYCERIA SPECIES IN BRIT AIN* 3. BIOMETRICAL STUDIES By::MARTIN BORRILL

The British representatives of section Glyceria are paludal species, they occupy a wide range of habitats and are occasionally found growing together (Hubbard, 1942); nevertheless each shows slightly different ecological tolerances. G. declinata (2n = 20) can grow in turf likely to be trampled and to dry out in summer. G. fluitans (2n = 40