Abstract
AbstractMuch progress has been made towards recognizing and circumscribing species of Encephalartos, and currently 65 species plus two subspecies are recognized. Some of the characteristics used for circumscription of species could be used to construct a phylogenetic tree, but others have merely diagnostic value. When constructing a phylogenetic tree, it is essential to keep in mind basic biological principles concerning reproductive behaviour, isolation and geographical distribution, because the first two especially are key factors in evolution. The following evidence is available for phylogenetic reconstruction: vegetative morphology, morphology of reproductive structures, pollen morphology, leaflet anatomy, chromosome number and morphology, chemical characteristics, isoenzyme profiles, DNA analyses and geographical information.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
