ISOETES x NOVAE-ANGLIAE (ISOETACEAE), AN ADDITIONAL HYBRID QUILLWORT FROM NEW ENGLAND

摘要

Isoetes x novae-cmgliae D.F. Brunt. & D.M. Britton, hyb. nov., represents a sterile hybrid between the tetraploid aquatic pteridophytes I. riparia and I. tuckermanii. It is known only from North Easton, Massachusetts although it formerly likely occurred across the state as well as in Connecticut and southern New Hampshire. Determination of the distribution and nomenclature of this taxon also clarifies the status of a number of early 20th century taxonomic innovations.