apex:
tip
apices:
tips, plural of apex
coriaceous:
leathery, tough
disarticulation:
breaking up
hyaline:
transparent. In botany, the term is usually used for structures that are also thin.
moniliform:
resembling a string of beads
rachis:
central axis. In these pages used for the central axis of the inflorescence.
trullate:
diamond-shaped