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.

  • Type

    Type. Bushy tree 4 m; frequent in cumbre along west rim 1-6 km north of camp caiio head, Serrania Paru, Amazonas, Venezuela, at alt. 2000 m, 4 Feb 1951, R. S. Cowan & John J. Wureiack 31241 (holotype NY). Paratype. Same locality, 31 Jan 1951, Cowan & Wurdack 31088.

  • 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 mm 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 mm 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.