Abstract: Angelonia integerrima Sprengel is a native species of the state of
Mato Grosso do Sul and the Southern region (Paraná, Santa Catarina and Rio
Grande do Sul) of Brazil, with features such as an unusual appearance and
color of the flowers, indicating an ornamental use. To optimize the use of this
species and to fill in gaps regarding its cytogenetic characterization, this study
determined the chromosome number, meiotic index and pollen viability of plant
individuals of four A. integerrima populations. All plant individuals of the four
populations had 2n = 20 chromosomes. Still, the meiotic index of most analyzed
plant individuals exceeded 90%, while pollen viability of all plant individuals
was higher than 80%. These data suggest considerable cytological stability of
the analyzed A. integerrima plant individuals, which may favor the selection
of future genotypes for commercial purposes or their use in conservation and
breeding programs of the species.

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