Abstract
Fifty-four species of the Chenopodiaceae in Israel were examined for their anatomical features, δ13C values, habitat and phytogeographical distribution. 17 species have δ13C values between -20‰ and -30‰and non-Kranz anatomy (NK) and are therefore considered as C3 plants. 37 species have δ13C values between -10‰ and -18‰ and Kranz or C4-Suaeda type anatomy and are therefore considered as C4 plants. Some C4 plants have leaf structure which seems to be intermediate between the Kranz and the C4-Suaeda type of leaf anatomy.The segregation of the species into photosynthetic groups shows tribal and phytogeographical grouping. Most of the C3 Chenopods are either mesoruderal plants or coastal halophytes, with a distribution area which covers the Euro-Siberian as well as the Mediterranean phytogeographical regions. The C4 Chenopods are mainly desert or steppe xerohalophytes with a distribution area which includes the Saharo-Arabian and/or Irano-Turanian phytogeographical regions.
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