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1.
PhytoKeys ; 243: 215-230, 2024.
Article in English | MEDLINE | ID: mdl-38974889

ABSTRACT

A new species of Eriotheca (Bombacoideae, Malvaceae) from montane wet forests in the Atlantic Forest of Bahia, northeastern Brazil, is described and illustrated. It is known from only three populations situated between 750 m and 850 m in elevation on mountain summits and categorized as Endangered (EN) based on IUCN criteria. Eriothecapaganuccii is distinct from all congeners by the combination of coriaceous to strongly coriaceous leaves and remarkable few-seeded, globose to subglobose woody capsules that contain scanty kapok and the largest seeds known in the genus to date. The affinities of E.paganuccii to morphologically similar species as well as the importance of obtaining phenologically complete collections are discussed.

2.
PhytoKeys ; 167: 31-43, 2020.
Article in English | MEDLINE | ID: mdl-33304117

ABSTRACT

A new species of Eriotheca (Malvaceae, Bombacoideae) from coastal areas in the northeastern Brazilian states of Alagoas and Bahia is described and illustrated. Eriotheca alversonii inhabits Atlantic coastal forest and is found principally on sandy soils in restinga vegetation. It is most similar morphologically to E. parvifolia. Both species have 3-foliolate leaves and short petioles on fertile branches, but the new species has smaller flowers, truncate to crenulate calyces, and smaller globose to subglobose capsules. The affinities of E. alversonii to morphologically similar species and its phenology are discussed. A distribution map and preliminary assessment of its conservation status are provided.

3.
Acta biol. colomb ; 12(supl.1): 75-90, dic. 2007.
Article in Spanish | LILACS | ID: lil-634861

ABSTRACT

Entre junio y agosto de 2005 se determinó la composición florística de las plantas ≥1 cm de DAP en un área de 0,2 ha de bosque húmedo tropical en los corregimientos de Pie de Pató (05º 30' 56" N y 76º 58' 26" W) y Nauca (5º 41' 6" N y 77º 00' 36" W), Alto Baudó, Chocó Colombia. En cada sitio se muestreó un área de 0,1 ha, la cual se dividió en diez transecto de 2 x 50 m cada uno. Se registraron 1.618 individuos, representados en 257 especies, 156 géneros y 56 familias botánicas de los cuales 842 individuos, 161 especies, 108 géneros y 46 familias fueron encontrados en Pie de Pató, y 776 individuos, 161 especies, 98 géneros y 45 familias en Nauca. En Pie de Pató las familias mejor representadas en lo que se refiere a géneros y especies fueron: Rubiaceae (doce géneros y 27 especies), Arecaceae (ocho géneros y ocho especies) y Bombacaceae (siete géneros y diez especies). En Nauca fueron Rubiaceae (once géneros y 25 especies), Moraceae (ocho géneros y trece especies) y Arecaceae (ocho géneros y ocho especies). El índice de riqueza arrojó valores de 23,75 y 24,05 para Pie de Pató y Nauca, en cambio la diversidad fue de 4,43 para ambos sitios. Los resultados indican que los bosques del Alto Baudó son muy diversos y de gran importancia para estudios de la diversidad florística, debido a su ubicación estratégica en el departamento del Chocó.


Between June and August of 2005 the floristic composition ≥1 cm of DAP was determined in an area of ? 0.2 ha of humid tropical forest at the localities of Pie de >Pató (05º 30' 56" N and 76º 58' 26" W) and Nauca (5º 41' 6" N and 77º 00' 36" W), Alto Baudó, Chocó Colombia . En each locality an area of 0.1 ha was sampled which was divided into smaller areas of 2 x 50 cm each. A total of 1618 inidivduals were recorded represented by 257 species, 156 genres and 56 botanical families from which 842 individuals, 161 species, 108 genres and 46 families where found at Pie de Pató, and 776 individuals, 161 species, 98 genres and 45 families at Nauca. At Pie de Pató the families best represented in terms of genres were Rubiaceae (12 genres and 27 species), Arecaceae (eight genres and eight species) and Bombacaceae (seven genres and ten species). At Nauca they were Rubiaceae (eleven genres and 25 species), Moraceae (eight genera and 13 species) and Arecaceae (eigth genres and eight species). The richness index was of 23,75 and 24,05 for Pie de Pató and Nauca respectively. Diversity change was stimated as 4,43 for both localities. These results indicate high diversity of these forests at Alto Baudó.

4.
Acta cient. venez ; 56(3): 103-107, 2005. ilus, graf
Article in Spanish | LILACS | ID: lil-537177

ABSTRACT

La dinámica de crecimiento de tubos polínicos fue estudiada en dos poblaciones de Pachira quinata, incluyendo los factores que la afectan como: el tipo de cruce, autopolinización y polinización cruzada intra e interprocedencia. El tiempo de cosecha de las flores afecta el número de óvulos penetrados, pero no afecta la distancia máxima alcanzada por los tubos, ni el número de tubos polínicos a lo largo del estilo. El número de tubos polínicos y la proporción de óvulos penetrados fue significativamente mayor cuando el polen fue almacenado a temperatura ambiente, comparado con los valores de polen refrigerado. El número de tubos polínicos a lo largo del estilo es independiente del tipo de cruce utilizado, asi mismo, la proporción de óvulos penetrados es menor en las polinizaciones interprocedencia que en cruces intraprocedencia y autopolinización. La alta proporción de óvulos penetrados en autopolinización indica que la incompatibilidad en Pachira quinata es una reacción de acción tardía y ocurre a nivel del ovario. El mayor número de óvulos penetrados en cruces intraprocedencia comparado con cruces interprocedencia, sugieren un efecto de depresión en la fecundación entre individuos de distintas áreas geográficas.


The dynamics of pollen tube growth was studied in populations of Pachira quinata, as well as the factors that affect it, such as: the type off crossing, self-pollination and cross-pollination among and inside populations. It was found that the time ofgathering of the flowers determines the number of penetrated ovules, but it does not determine the maximum distance reached by the tubes, neither the number of pollen tubes along the style. The number of pollen tubes and the proportion of ovules penetrated were significantly bigger when the pollen was stored at environment temperature, compared with the values of refrigerated pollen. The number of pollen tubes along the style is independent of the type of crossing used; likewise, the proportion of penetrated ovules is smaller in the pollinations among populations than in crossing among populations and self-pollination. The high proportion of ovules penetrated in self-pollination indicates that the incompatibility in Pachira quinata is an auto-incompatibility of late action that occurs at the ovary zone. The biggest number of ovules penetrated throughout crossing inside populations compared with crossing among populations suggests the existence of an out-breeding depression effect among individuals from different geographical areas.


Subject(s)
Bombacaceae/classification , Bombacaceae/chemistry , Crosses, Genetic , Pollen Tube/anatomy & histology , Pollen Tube/classification , Biology , Botany
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