Synonyms for Bast (same or very similar meaning)
WordNet sense 1 (strong woody fibers obtained especially from the phloem of from various plants):
bast fiberWordNet sense 2 ((botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes):
phloemFrom the ODE community, based on WordNetadd/edit