Monographs Details: Gleasonia duidana var. latifolia Steyerm.
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Rubiaceae
Description:Species Description - A var duidana laminis late ovatis vel ovato-oblongis plerumque 11-15 cm latis, apice plerumque rotundatis vel subtruncatis recedit; laminis subtus plus minusve strigilloso-asperulis, nerviis tertiariis venulisque prominentibus; inflorescentiis maturis late patentibus in anthesi plerumque 1S-22 cm altis 22-30 cm latis, ramulis ultimis tertiariisque saepe elongatis 3-6 cm longis; pedicellis plerumque mani-festis.

Distribution and Ecology - Upper slopes and summits of sandstone table mountains of Territorio Federal Amazonas, southwestern Venezuela. VENEZUELA. Amazonas: Cerro Yutaje, frequent at Camp Yutaje, alt 1300 m, 27 Feb 1953, Bassett & Celia K. Maguire 35344 (holotype NY), near Camp Yutaje, alt 1300 m, B. & C. K. Maguire 35089; Cerro Corocoro, Serrania Yutaje, alt 1500 m, B. & C. K. Maguire 35487; summit, Cerro Guanay, alt 1800 m, Maguire, Phelps, Hitchcock & Budowski 31720; Cerro Sipapo (Paraque), mixed woodland, West Mountain, alt 1800 m, Maguire A Politi 28396; falda occidental, alrededor de canos, alt 1500 m, Phelps 54

Discussion:

This is the broadest-leaved variation of G. duiclana, apparently limited to the sandstone table mountains of the western sector of the Venezuelan Guayana. In this variation the inflorescence attains its greatest development, exemplified by the type collection, with a breadth of 30 cm and a height of 15 cm. The tertiary and ultimate branches of the inflorescence are generally elongated from 3-6 cm, but in Maguire & Politi 28396 the inflorescence is only 6 cm high and 10 cm across, and in K.D. Phelps 54 may also be as small as 10 cm across, these collections, therefore, showing transition and intergradation into G. duidana var duidana.