It can be considered as a plesiomorphy
, because there is no other evidence on the existence of a close relationship among these three taxa or it can be considered as a convergence character; the long III segment (long labium) has developed independently in these groups.
Concluding that the dicotyledonous embryo is a plesiomorphy
among seed plants implies that the monocotyledonous embryo of monocots is a distinctive autapomorphy for this class of angiosperms.
The presence of only one gland type in the adhesive organ is interpreted as a plesiomorphy
when viewed in combination with the retention of other primitive traits (Tyler et al., 1980).
(1995) - specifically, the resolution of Anomochloa and Streptochaeta as elements of the earliest lineage of grasses to diverge from the line that includes all others - the pseudospikelets present in these taxa can be regarded either as a synapomorphy of this lineage (i.e., Anomochlooideae) or as a plesiomorphy
of the grasses that is retained only in these two genera, though in modified form in Streptochaeta (Judziewicz & Soderstrom, 1989).