معرفي سه ركورد جديد از جنس EQUISETUM L از استانهاي شمالي ايران

Introducing of 3 new records of Equisetum L. for north of Iran

Horsetail genus (Equisetum L.) belongs to Equisetaceae. There are 25 living species in the world that are identified and these species are distributed worldwide, except Australia and New Zealand. 5 species are reported from Iran which are: E. telmateia Ehrh., Hannov. Mag., E. ramosissimum Desf., E. arvense L., E. fluviatile L. and E. palustre L. 3 new records have been reported from the north of Iran for the first time for Iranian sphenoflora: E. variegatum Schleicher ex Weber & Mohr., E. pratense Ehrh. and E .hyemale L. Plants specimen were collected from humid and semi-humid regions of Golestan, Guilan, Mazandaran, Ardabil, Qazvin & Tehran province. For identifying every record, morphological characters such as stem length, the number of sheets, the number of grooves, were used.