Monographs Details: Orectanthe ptaritepuiana (Steyerm.) Maguire
Authority: Carlquist, Sherwin. 1960. Anatomy of Guayana Xyridaceae: Abutboda, Orectanthe and Achtyplola. Mem. New York Bot. Gard. 10: 63-117.
Discussion:The sepal of this species consists wholly of lignified parenchyma, except in the central portion of the keel, where thin-walled parenchyma occurs. This thin-walled parenchyma presumably contains a moderate number of chloroplasts, as it does in O. sceptrum.