Equitant
Equitant , adjective
[Latin equitans, -antis, present participle of equitare to ride, from eques horseman, from equus horse.]
1.
Mounted on, or sitting upon, a horse; riding on horseback.
2.
(Botany) Overlapping each other; -- said of leaves whose bases are folded so as to overlap and bestride the leaves within or above them, as in the iris.