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Compare with https://pubmed.ncbi.nlm.nih.gov/25232624/

Photo #1 2 females

Photo #2 male

Photo #3 female

photo #4 male below vs male Chirocephalus diaphanus above

photo #5 female at the center vs Chirocephalus diaphanus around and below

photo #6 male at the center vs Chirocephalus diaphanus above

Note transparent caudal furca vs. red caudal furca of Chirocephalus

In females, egg sacs are sort of cigar shaped (approx. fusiform) with brown eggs (and have a pale blue tinge Margarida Maló Machado, com. pess.)

Photo #7 female

with @jmneiva

Least common Cyperus at the site. Sort of isolated from nearby clumps of C. difformis and C. eragrostis

last picture comparison with other Cyperus species at the site: left to right - difformis (older spikes, frutification), fuscus, eragrostis, difformis (flowering)

https://flora-on.pt/#1Cyperus+fuscus

Um caso de estudo para quem se interessa por esta rara planta, por aqui chamada de loendro, mas em outros locais também rodendro ou adelfeira. Existe somente neste ribeiro de Telhadela e de forma descontinuada.