Clarification of Morphological Terms Used in the Stipeae (Gramineae), and a Reassessment of Nassella in Australia

Terms used for describing the apical regions of the lemma of the Stipeae have been used inconsistently in the past. Those terms are listed and defined, and recommendations made for consistent usage where either more than one term has been used for the same structure or the same term has been used for more than one structure. Nassella is accepted as a segregate genus of Stipa but S. caudata and S. brachychaeta, two species confused in the past, are excluded from Nassella and are best placed in Achnatherum.