Orchidaceae neotropicales, ii: de orchidaceis principaliter colombianis notulae

During the past fifteen or twenty years, plant exploration in Colombia has been greatly intensified. The number of collections, especially from the high Andean regions of the country, is now very much more comprehensive; and monographic. and floristic projects should find in this trend strong impetus and keen encouragement. The very task of routine identification of plant collections often uncovers significant information. Frequently, species or genera turn up which are new either to Colombia or to a given phytogeographic province of the country.During the past fifteen or twenty years, plant exploration in Colombia has been greatly intensified. The number of collections, especially from the high Andean regions of the country, is now very much more comprehensive; and monographic. and floristic projects should find in this trend strong impetus and keen encouragement. The very task of routine identification of plant collections often uncovers significant information. Frequently, species or genera turn up which are new either to Colombia or to a given phytogeographic province of the country

Patrones biotipológicos a nivel foliar de la vegetación y su respuesta a las series hídricas en áreas de la Región Caribe de Colombia

Se presentan los resultados del análisis de las variaciones morfo-ecológicas en diferentes formaciones vegetales a lo largo de un gradiente de precipitación en localidades del Caribe de Colombia. El patrón biotipológico para todo el gradiente de precipitación corresponde a hojas simples, grandes (mesófilas y macrófilas), alargadas, de borde entero, ápice puntiforme, con base aguda u obtusa, consistencia membranosa y subcoriácea, sin protección, nerviación penninervia y tipo de grosor B (0.16 mm-0.35 mm). En los sitios con mayor precipitación aumentó el predominio de las hojas simples, mesófilas y macrófilas, de consistencia coriácea y sub-coriácea, ápice puntiforme condición que se relaciona con el drenaje efectivo del agua sobre la lámina foliar, forma alargada, base aguda y obtusa, bordes irregulares (serrulados y ondeados), tipo de grosor B, C, D y E, nerviación penninervia y sin protección. En los sitios con menor precipitación aumentó la representación de hojas micrófilas, ápice angulado, categoría de grosor tipo A, y protección en ambas caras de la lámina foliar. En las características cuantitativas se observó una tendencia al aumento del área de la lámina foliar, el peso específico, la esclerofilia y el grosor en los sitios con mayor precipitación especialmente en los estratos inferiores donde estas características mostraron mayor representación. La participación de la esclerofilia se redujo en los estratos inferiores en todos los sitios. El modelo biotipológico foliar en la mayoría de las familias y géneros muestra las mismas tendencias observadas para el gradiente de precipitación. / Abstract.The results of the analysis of the morpho-ecological leaf variations according to vegetation types in along a rainy gradient at the Caribbean region of Colombia are presented. The morfo-ecological pattern corresponds to simple leaves, large (mesophyll and macrophyll leaf), elongated, entire margin, apex punctate (acuminate), with acute or obtuse base, membranaceous and sub-coriaceous consistency, absence of indument, pinnate nervation-type and thickness degree type B (0.16 mm-0.35 mm). The predominance of simple leaves, mesophyll and macrophyll, coriaceous and sub-coriaceous consistency, punctate apex (condition related whit effective drainage of water on the leaf), elongated, acute and obtuse base, irregular margin (serrate and undulated), thickness degree type B, C, D and E, pinnate nervation and absence of indumenta increased in rainy sites, meantime, the microphyll leaves and angled apex, thickness type A (0.005-0.15 mm) and presence of indument on both sides of the leaf increased in dry sites. The venation of leaf, base and type leaf (simple or compound) didn’t show along with the rainy gradient. The area leaf, specific weight, sclerophyllous and thickness degree increased at rainy sites specially in the lower strata where these characteristics showed a higher representation. The percentage of sclerophyllous decreased in the lower strata in all sites. The leaf model in most important families and genera in the rainy sites show the same tendencies that in the precipitation gradient.Maestrí

Byrsonima crassifolia

Angiosperm

Byrsonima crassifolia

Angiosperm

Byrsonima crassifolia

Angiosperm

Heteropterys prancei

Angiosperm