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I. Rehabilitation of Alvaradoa subovata Cronquist (Simaroubaceae), the correct scientific name for the "pichi blanco". II. Roupala cataractarum Sleumer is a synonym of Roupala brasiliensis Klotzch (Proteaceae). A brief account regarding the validated nomenclature, Roupala brasiliensis and Alvaradoa subovata, for both taxa is given. Pollen observations obtained from SEM, in order to complement the identifications, are also given. [ABSTRACT FROM AUTHOR]

Roupala sessiliflora, a new species endemic to Costa Rica is described and illustrated. This new taxon is somewhat related to R. mexicana, but differs by its sessile flowers and shorter tepals. In addition, it is similar to R. cordifolia, but R. sessiliflora differs by its broadly elliptic to obovate leaf blades, cuneate at the base, sessile flowers, and shorter tepals. [ABSTRACT FROM AUTHOR]

Morphological observations on pollen grains of Alvaradoa subovata Cronquist (Simaroubaceae) and Roupala brasiliensis Klotzch (Proteaceae) obtained from TEM complement previous studies of Xifreda & Sanso (1998). With the aim of giving details of the morphology and accuracy to the descriptive terminology, exine stratification is described and new observations on pollen grains obtained from SEM are added. [ABSTRACT FROM AUTHOR]