Monophyllous

• (a.) One-leaved; composed of a single leaf; as, a monophyllous involucre or calyx.
Found on http://thinkexist.com/dictionary/meaning/monophyllous/

Monophyllous

Mo·noph'yl·lous adjective [ Greek mono`fyllos ; mo`nos alone + fy`llon leaf: confer French monophylle .] (Botany) One-leaved; composed of a single leaf; as, a monophyllous involucre or calyx.
Found on http://www.encyclo.co.uk/webster/M/95

monophyllous

consisting of a single lobe, often undulate or folded.
Found on http://www.anbg.gov.au/glossary/webpubl/lichglos.htm
No exact match found