What does "sphenophyte" mean?

Any of an ancient type of simple vascular plants of which only the horsetails remain which have hollow stems that produce spores

What is a synonym for "sphenophyte"?

Common synonyms include: horsetail.

noun

noun ·Rare ·Advanced level

Noun

1
Any of an ancient type of simple vascular plants of which only the horsetails remain which have hollow stems that produce spores

From spheno- (“wedge”) + -phyte (“plant”).