Biossistematica de quatro especies de Hippeastrum Herb. (Amaryllidaceae)

AUTOR(ES)
DATA DE PUBLICAÇÃO

1996

RESUMO

Although Hippeastrum is the official name for the New World species, Amaryllis has been much favoured by the majority of taxonomists who worked with the group. So many of the species have been described as Amaryllis, and their combination in Hippeastrum has not yet been published. In the subgenus Omohalissa there are several species which are sometimes difficult to distinguish because of intermediate forms. Four different species of subgenus Omphalissa, growing simpatrically near the town of Atibaia, Brazil, were morphologically analysed. The species showed several intermediate forms which made it difficult, in some cases, to identify them. Statistical treatment of measures taken from several parts of the inflorescence showed that a continuity exists but that there is a significant distinction between the species. Observation of other characteristics indicated that vegetative, ecological and phenological data are very important for the characterisation and distinction of a species and the identification of an individual. The morphological continuity between the species may be explained and reinforced by the easy hybridisation between most species of the genus and the existence of these hybrids and introgression in natural populations. Variability resulting from hybridisation ma:r also help explain the diversity of environments occupied by the species. Similarity of the basic karyotype between the species, even though there is a reasonable variation in the populations, may favour the crossings and gene exchanges

ASSUNTO(S)

morfologia vegetal plantas ornamentais citologia botanica - classificação

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