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    Foliar epidermal studies in the family Bignoniaceae Juss. in Nigeria
    (Academic Journals, 2008-02) Ugbabe, G. E.; Ayodele, A. E.
    Comparative studies have been carried out on the leaf epidermal features of eleven species of the family Bignoniaceae in Nigeria. The species are relatively uniform in the qualitative macro morphological characters except in the leaf shape, which varies from ovate, elliptic, oblong-elliptic, oblong, oblanceolate to obovate-lanceolate. A more constant macro character for the species is the leaflet length /leaflet width ratio, which ranges from 2:1 to 4:1. The epidermal morphology of the adaxial and abaxial surfaces of the species was studied with the light microscope. The epidermal cells are polygonal, irregular or both. Anticlinal walls are straight, curved or undulate/ wavy. Leaflets of all species are hypostomatic with stomata restricted to the abaxial surface. The Anomocytic stomata type is most prominent except Kigelia africana, which has diacytic stomata. Striae are present on the adaxial surface of Oroxylum indicum and abaxial surface of Spathodea campanulata. Knobs are present on the abaxial and adaxial surfaces of Markhamia lutea, Markhamia tomentosa, abaxial surface of Stereospermum kunthianum and adaxial surface of Tabebuia rosea. Other features of the epidermis that show variation include stomatal size, shape and frequency. Epidermal cell shape, anticlinal wall undulation, striation on the epidermis, stomata type, distribution and stomata index are of taxonomic importance in the family while epidermal size and number are of little diagnostic value. The significance of these observations is discussed in relation to the taxonomy of the family.
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    The pollen morphology of Nigerian bignoniaceae Juss
    (2007) Ugbabe, G. E.; Ayodele, A. E.; Okogun, J. I.; Inyang, U. S.
    The Pollen grains of eleven species of the Bignoniaceae represented in Nigeria have been studied by the light Microscope. The pollen grains are mostly circular or elliptic. The circular ones include those of Crescentia cujete Linn. Markhamia tomentosa (Benth.) K.Schum., Newbouldia laevis Seem., Oroxyllum indicum Vent., Spatliodea campanulata P.Beauv., Stereospermum acuminatissimum K.Schum., Stereospermum kunthianum Cham., and Tabebuici rosea (Berthol) DC. while the Elliptic ones are: Kigali a africana (Lam) Benth., Markhamia litlea (Benth.) K.Schum. and Tecoma stans (Linn ) H.B & K. and the shape/class range from prolate, sub-prolate to prolate spheroidal. The Prolate ones are Kigelia africana, Markhamia tomentosa, and Tecoma stans; the Subpralate types includes those of Crescentia cujete, Markhamia lutea, OroxyUum indicum. Spathodea campanulata and Stereospermum acuminatissimum; while the Prolate-Spheroidal types are those of Stereospermum kunthianum and Tabebuia rosea. They are either tefra- colporate or tri-colporate. The pollen of Crescentia cujete is Tetra-Colporaie while tiic others are Tri-colporate (Tri-colporate = Pollen grains with three ectocolpi;). The different pollen types are useful in the identification of the Nigerian Bignoniaceae.