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Cyperaceae family

Cyperus involucratus
Rottbøll
, Descr. Pl. Rar. 22.  1772.
Syn.: Cyperus alternifolius subsp. flabelliformis Kükenthal (1936).

Umbrella plant
Naturalized quite rare herb of swampy spots and river valleys.
Native to tropical Africa, Yemen.
Also a cultivated ornamental.