A preliminary molecular phylogeny for these species is presented; their distribution and cytology are discussed. The taxonomy and nomenclature of the I. histrix and I. duriei groups need considerable further study. The first hybrids for the region are documented. | Turk J Bot 32 (2008) 447-457 © TÜBİTAK The Genus Isoetes L. (Isoetaceae, Lycophyta) in South-Western Asia Jay F. BOLIN1, Rebecca D. BRAY1, Mustafa KESKİN2, Lytton J. MUSSELMAN1,* 1 Department of Biological Sciences, Old Dominion University, Norfolk, Virginia 23529-0266, USA 2 Marmara University, Science Institute, Göztepe Campus, 34722 Kadıköy, İstanbul - TURKEY Received: Accepted: Abstract: Quillworts or Çim Eğreltisi, species of the genus Isoetes L. in Turkey and the Levant, are poorly studied despite extensive floristic studies in the region. The Flora of Turkey lists 4 taxa: Isoetes olympica (2n = 22), I. histrix Bory var. histrix (2n = 20), I. subinermis (Bory) Cesca & Peruzzi [=I. histrix Bory var. subinermis Durieu (2n = 22)] and I. duriei Bory (2n = ca. 121). An additional species, I. anatolica Prada & Rolleri, was described in 2005 from Bolu province, and we report the first count for this species, 2n = 22. In Syria and Lebanon 2 species are known: I. olympica from a site in Syria and a known but undescribed plant from Akkar province (Lebanon) and adjacent Syria (2n = 22, first count). A preliminary molecular phylogeny for these species is presented; their distribution and cytology are discussed. The taxonomy and nomenclature of the I. histrix and I. duriei groups need considerable further study. The first hybrids for the region are documented. Key Words: Quillworts, Çim Eğreltisi, Lebanon, Syria, Turkey, megaspores, chromosome counts, molecular phylogeny Güneybatı Asya’daki Isoetes L. (Isoetaceae, Lycophyta) Cinsi Özet: Türkiye ve Levant olarak adlandırılan coğrafik alanda İngilizce ‘Quillworts’, Türkçe ‘Çim Eğreltisi’ olarak adlandırılan Isoetes cinsi, bu alandaki büyük floristik çalışmalara karşın, çok az incelenmiştir. Türkiye Florasında 4 takson bulunmaktadır: Isoetes olympica (2n = 22), I. histrix Bory var. histrix (2n = 20), I. subinermis (Bory) Cesca & Peruzzi [=I. histrix Bory var. subinermis Durieu (2n
