_____________________________________________________________________________________________________ *Corresponding author: E-mail: ebijoe4@gmail.com; International Journal of Plant & Soil Science 17(2): 1-9, 2017; Article no.IJPSS.33496 ISSN: 2320-7035 Anatomical Relationships among Three Species of Curcubitaceae J. K. Ebigwai 1* , A. Aniema 1 and A. A. Egbe 1 1 Department of Botany, University of Calabar, Nigeria. Authors’ contributions This work was carried out in collaboration among all authors. Author JKE designed, supervised and wrote the final manuscript. Author AA collected data and managed the experiment while author AAE performed the statistical analysis and did the literature search. All authors read and approved the final manuscript. Article Information DOI: 10.9734/IJPSS/2017/33496 Editor(s): (1) Jaydip Mandal, Department of Education in Science and Mathematics, Regional Institute of Education, Bhopal, India. (2) Dr. Scd Victoria Anatolyivna Tsygankova, Department for Chemistry of Bioactive Nitrogen-Containing Heterocyclic Compounds, Institute of Bio-organic Chemistry and Petrochemistry, Plant Physiology, NAS, Ukraine. (3) Prof. Marco Trevisan, Institute of Agricultural Chemistry and Environmental Research Centre BIOMASS, Faculty of Agriculture, Catholic University of the Sacred Heart, Italy. Reviewers: (1) D. A. Zhigila, Gombe State University,Gombe State, Nigeria. (2) Imen Ben Ammar, University in Sousse, Tunisia. (3) Kamal I. Mohamed, Professor & Director of Rice Creek Field Station, USA. (4) M. Qureshimatva Umerfaruq, Gujarat University, Ahmedabad, India. (5) Uzma Hanif, GC University Lahore, Pakistan. Complete Peer review History: http://www.sciencedomain.org/review-history/19819 Received 19 th April 2017 Accepted 19 th June 2017 Published 3 rd July 2017 ABSTRACT Anatomical relationship among Citrullus lanatus (Thunb.) Matsum. & Nakai, Cucumeropsis mannii Naudin and Lagenaria siceraria (Molina) Standl planted in controlled conditions in the Botanical garden of the University of Calabar were determined. Standards anatomical (transverse) sections of the leaves were prepared and photo micro graphed. Generalized transverse sections of the leaf, stomata and trichome were studied. The result showed a single layer of epidermal cells, a thick cuticle on both leaf surfaces, presence of hairs and the occurrence of collenchymatous tissues along the median line of the upper surface of each leaf midrib. The palisade parenchyma consists of 2 to 3 layers of elongated, cylindrical cells which are closely packed together in all the species while the spongy parenchyma are loosely arrange with numerous intercellular spaces and are irregular in shape in all species. The vascular bundles in all the species are bicollateral but are differentially arranged depending on species. Anatomy of the leaf section reveals the presence of Original Research Article