equitant
Concise Oxford English Dictionary © 2008 Oxford University Press:
equitant /ˈɛkwɪt(ə)nt/
▶adjective Botany (of a leaf) having its base folded and partly enclosing the leaf next above it, as in an iris.
– origin C18: from L. equitant-, equitare ‘ride a horse’.
'equitant' also found in these Oxford entries:

