Abstract
The Author discovers and describes a new station of Stipa trichotoma Ness (Nassella trichotoma Hackel) in the «Selva di S. Rossore » (Pisa), where it represents an adventitious and probably newly naturalized species for the Tuscan Flora. The Author refers on the preceedind foundings of this south-American plant in Italy, discussing the complicated sinonimy, and points out the opportunity for the constitution of-a new section Nassellopsis and the interest to include the species in the new edition of «Nuova Flora Analitica d'ltalia» of Adriano Fiori.

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