Monographs Details: Pagamea diceras Steyerm.
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Family:Rubiaceae
Scientific Name:Pagamea diceras Steyerm.
Description:Latin Diagnosis - Arbuseula 4-metralis; stipularum vaginis 5-9 mm longis glabris apice erosopaleaceis 8 setis glabris inaequalibus 0.5-2.5 mm longis; foliis petiolatis, petiolis 2-4 mm longis glabris; laminis oblanceolatis vel oblongo-oblanceolatis ad elliptieo-obovatis subrevolutis apice obtusis vel subacutis basi cuneatim subacutis vel aeutis 2.6-5 cm longis 1.5-2 cm latis, utrinque glabris; nervis lateralibus utroque latere 5-6 fere obsoletis; inflorescentiis subspicatis 12-18 mm longis 9-15 mm latis cum pedunculo 2.5-5 cm longis, pedunculo 1.5-4 cm longo apicem versus ampliato complanatoque ad 3-4 mm lato, infra medium 1.5-2 mm lato, ancipitali glabro; floribus sessilibus per duo latera rhachidis instructis; calyce campanulato 3 mm longo apice 3 m m lato utrinque glabro marginibus ciliolatis exceptis inaequaliter 4—5 lobato, lobis triangulari-ovatis aeutis 1 mm longis 1-1.25 mm latis; corolla subcampanulato-subrotata 5-5.5 mm longa, tubo 2 mm longo basi 2 mm lato fauce 3-3.5 mm lato, fauce intus dense villosa, aliter glabro, lobis oblongo-lanceolatis obtusis cum appendice cucullata inflexa 3.25-4 mm longis 1.5 mm latis extus glabris intus dense albido-lanulosis; staminibus 5, antheris 1.75 mm longis breviter exsertis, filamentis 1 m m longis glabris; ovario glabro, stylo 3.25 mm longo glabro; stigmatibus 1 mm longis linearibus apice truncatorotundatis: fructu subglobose, 4-5 mm longo, 4-5 mm lato.

Discussion:This species is characterized by the flattened upwardly broadened rachis of the inflorescence, the flowers unilaterally subspicate, sessile, arranged in two series along the rachis, the pentamerous flowers with ciliolate calyx-margins, glabrous peduncle, and glabrous obsoletely-nerved leaf-blades.