Abstract

JOLOCHIN, Gabriela. Leaf venation patterns in myrtaceae of la selva biological station, Heredia, Costa Rica. Polibotánica [online]. 2014, n.38, pp.95-111. ISSN 1405-2768.

Descriptions base in leaf architecture, with emphasis in venation patterns, to four genera and 14 species found in the zone, including two species mentioned as exotic, for the Biological Station La Selva, OET, Heredia, Costa Rica. Fresh leaves were collected in the biological station and INB and CR herbaria were visited, besides to consult the herbarium of the own station and images of the MO. It was observed that 85% of the species have a secondary venation pattern camptodromus-brochidodromus and ca. 50% have straight secondary ribbings that only curve near the margin simulating intra-marginal ribbing. The third venation pattern was detectable only in seven species, four with a reticulate pattern and last marginal venation with arches or no visible. The combination of leaf architecture data with venation patterns allow discriminating species and generates a key of determination for easy field use.

Keywords : Costa Rica; La Selva Biological Station; leaf morphology; Myrtaceae; venation patterns.

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