Isoetes fluitans sp. nov.: The identity of Spanish plants of 'I. longissimum'

Abstract

Recent revision of North African specimens of Isoetes velata A. Braun and the closely related taxon l. longissimum Bory, together with Spanish material conventionally designated I. longissimum, suggests that the Spanish specimens constitute a new species, I. fluitans. This is described and illustrated. The North African taxon I. longissimum is probably not specifically distinct from I. velata. © 2004 The Linnean Society of London.