[en] The morphological plants traits change as an adaptation to the environment where the populations live. That intraspecific variation, or phenotypic plasticity, can be explained due to climatic or geographic factors. In the following work are studied the morphological differences between sympatric and a hybrid of the Erica genus in a latitudinal and longitudinal gradient. Plants from six populations, five from the North Spain and one from the Netherlands, were studied. For that work latitude and altitude are going to be considered, but also the differences between the populations due to different environmental factors. In the morphological study were measured eleven parameters, five related with leaves and six with flowers, in 77 individuals. The values were analised with ANOVA or Kruskal-Wallis test when the data did not stick to the normality model. The results showed that about vegetative traits differences were found in all species for the leaves length (larger in higher altitude, in E. tetralix latitude, that is smaller in larger size, is also included), except in E. mackayana; in E. stuartii specie for length – width relation (smaller in higher altitude) and in E. mackayana and E. stuartii species for leaves length-petiole (smaller in higher altitude). About reproductive traits differences were found in E. mackayana for corolla opening and length-corolla opening relation (smaller in higher altitude) and in E. stuartii for length–corolla width (smaller in higher altitude). However, for most of the traits no differences were observed between species that could be related with climatic, latitudinal, or altitudinal gradients. In general, the results observed in the study do not seem conclusive to relate the differences observed with the altitude and latitude that the populations present. So, the species phenotype studied do not seem to be related with their geographical differences.

[gl] As características morfolóxicas das plantas varían como adaptación ao ambiente no que viven as poboacións. Esta variación intraespecífica, ou plasticidade fenotípica, pode explicarse polos factores climáticos e xeográficos. No seguinte traballo, estúdanse as diferenzas morfolóxicas que hai en tres especies simpátricas e un híbrido do xénero Erica nun gradiente latitudinal e altitudinal. Estudáronse prantas en seis poboacións, cinco do norte de España e unha dos Países Baixos. Para este traballo teranse en conta a latitude e a altitude, inda que tamén se avaliaran as diferencias entre as poboacións debido a diversos factores ambientais. No estudo morfolóxico medíronse once parámetros, cinco respecto as follas e seis respecto as flores, en setenta e sete individuos. Os valores analizáronse mediante ANOVA ou test de Kruskal-Wallis cando os datos non se axustaban ao modelo de normalidade. Os resultados mostraron que respecto a caracteres vexetativos atopáronse diferenzas en tódalas especies para o largo da folla (maior a maior altitude, en E. tetralix tamén se inclúe a latitude, que é menor a maior tamaño) excepto en E. mackayana; na especie E. stuartti para as relacións largo-ancho (menor a maior altitude) e nas especies E. mackayana, e E. stuartti para a relación largo folla-pecíolo (menor a maior altitude). Respecto a caracteres reprodutivos atopáronse diferenzas en E. mackayana para a apertura corola e relación largo-apertura corola (menor a maior altitude) e en E. stuartii para a relación largo-ancho da corola (menor a maior altitude). Sen embargo, para a maior parte dos caracteres non se observaron diferenzas entre especies que podan relacionarse con gradientes climáticos, altitudinais ou latitudinais. En xeral, os resultados que se observan no estudo non parecen concluíntes para relacionar as diferenzas observadas coa altitude e latitude que presentan as poboacións. Polo tanto, o fenotipo das especies estudiadas non parecen estar ligadas as súas diferenzas xeográficas.