are: (1) “exclusively linear-lanceolate blades” which are also
seen in H. ovalis ssp. linearis; (2) “elongate-cuneate base” which also
describes the narrowly triangular leaf base of H. ovalis ssp. linearis;
and (3) “alternate cross venation,” a weak characteristic since venation
varies widely in H. ovalis from paired to alternating, sometimes
on the same leaf.