Abstract
Comparative studies on the structure of the vascular supply of stem-leaf transitional zone of the petioles were carried out in 15 papilionoid tree species. Anatomical characteristics and changes in the main vascular trace were recorded. The anatomical features of significance include outline; epidermal cell; pericyclic fiber patterns; main petiolar vasculature; presence, number and separation of ridge vascular bundles; presence of additional accessory ridge bundles; crystal types; secretory elements and multicellular trichomes. Erythrina variegata and Pterocarpus indicus show no change in the petiole trace structure throughout their petioles from proximal to distal, while the rest of the species have minor to major changes. Sophora secundiflora has the highest number of ridge vascular bundles (5-6), while these are absent in the two Dalbergia species, E. variegata, Derris robusta, Sophora davidii and S. japonica. Only Derris robusta and Sophora japonica show unusual petiole trace structure by having two additional accessory ridge bundles adaxial of the main trace enclosing with it by a complete ring of pericyclic fibers. The studied species of tribe Millettieae show the presence of secretory cavities lined by epithelial cells. The usefulness of these character states is shown for assessing, identifying and delimiting these examined species. Key words: Accessory ridge bundles, Crystals, Papilionoideae, Petiole anatomy, Petiole vasculature, Ridge bundles, Secretory cavities DOI: 10.3329/bjpt.v14i2.530 Bangladesh J. Plant Taxon. 14(2): 101-115, 2007 (December)
Highlights
Papilionoideae is the biggest subfamily of the three widely recognized subfamilies of Fabaceae, and consists of 31 tribes (Polhill 1981, Mabberley 1997, Lewis et al 2005)
Namely epidermal cells shape, cortex structure, pith, crystal type, mucilage elements showed some specific variations among the studied species
The unique pattern of bundle division in Dalbergia sissoo and Tipuana tipu account for the close relationship between them belonging to tribe Dalbergieae, similar relationship was seen in Derris elliptica and Bolusanthus speciosus belonging to tribe Millettieae
Summary
Papilionoideae is the biggest subfamily of the three widely recognized subfamilies of Fabaceae, and consists of 31 tribes (Polhill 1981, Mabberley 1997, Lewis et al 2005). The characters of pericyclic sclerenchyma in the petioles are diagnostic to Pterocarpus indicus, Bolusanthus speciosus, Pongamia pinnata, Derris elliptica, D. robusta and Sophora japonica.
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