Abstract

GARZON-VENEGAS, JAVIER  and  OROZCO, CLARA INÉS. Floral organogenesis in Acnistus arborescens, Dunalia solanacea, Deprea bitteriana, Larnax glabra and Larnax hawkesii- tribe Physaleae (Solanaceae). Caldasia [online]. 2006, vol.28, n.2, pp.227-242. ISSN 0366-5232.

The floral organogenesis of Acnistus arborescens, Dunalia solanacea, Deprea bitteriana, Larnax glabra, and Larnax hawkesii, of tribe Physaleae (Solanaceae) was studied using scanning electron microscopy in environmental mode. Three ontogenetic states were examined to compare the five studied species. These species share the acropetal sequence of sepals, petals, stamens, and carpels development, these also share the simultaneous development of petals, stamens, and the simultaneous arrangement of corolla and androecium. The late sympetaly is another common characteristic share among species but in Larnax species is later. This characteristic is important to consider in the differentiation between Deprea and Larnax. The most notorious intergeneric differences are related to sepals emergence sequence, it is simultaneous in D. solanacea; while is helicoid in D. bitteriana and in the two species of Larnax, and is intermedium between whorled and helicoid in A. arborescens. Carpel primordia are fused in an early development state, all species are bicarpelar but the "false septa" presence in A. arborescens gives the appearance of a tricarpelar gyneceum.

Keywords : Floral organogenesis; Acnistus; Deprea; Dunalia; Larnax; Physaleae; Solanaceae.

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