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The seedlings of Cassia fistula L. were studied for their morphological characters including stomatal and epicuticular wax crystalloids types. Germination in C fistula is Phanerocotylar-Epigeal-Reserve (≈PER) type. Cotyledons in C. fistula are isocotylar, opposite, flat leathery, sessile to sub-sessile, coriaceous and oblong-obovate in shape. Both apex and basal angles are obtuse. Cotyledons exhibited expansion during early days. Cotyledons of 1-day old seedlings were 74 to 94 mm2 in size which increased to 255 to 267 mm2 in size in 5-day old seedlings. There was apparently no further increase in cotyledonary size in older seedlings. Cotyledons were c 242 mm2 in size in 40-day old seedling presumably being consumed with age when epicotyl develops. Epidermal cells polygonal in shape. An anticlinal wall of the epidermal cells was straight, arcuate or sinuous. Trichomes are present on lower hypocotyl, epicotyl, stipules and leaf. They are unicellular, unbranched, generally short, sometimes long, non-glandular, straight or curved (sword-like), hooked and with round basal cell, on veins as well as lamina. The trichome density on young leaflet (1.2 cm2 in area) was found to be 85.12 ±2.55 trichomes per mm2 . C. fistula leaflets were amphihypostomatic. Stomatal outer ledges formed protective elliptical rim around stomatal pore. Taken together all of the organs (hypocotyl, cotyledons, epicotyl and leaflets) diverse type of stomata (nomenclature based on Prabhakar, 2004) were seen - paracytic, anisocytic tetracytic, 1½ cyclic tetracytic, staurocytic, anomocytic and abnormal contiguous stomatal type were seen in C. fistula seedlings. Basic type of stomata appeared to be the one with paracytic arrangement of subsidiaries which, however, appeared to change into anisocytic type as a result of the development of a wall within a subsidiary. Such a structure by further development of cell walls appeared to change to anomocytic type. The cotyledonary stomatal density was somewhat higher on upper surface (233.49 ± 4.085 stomata per mm2 than lower surface (212.85 ± 4.99 stomata per mm2 ). The stomatal density on ventral surface of leaflet averaged to 176.94 ± 5.38 stomata per mm2 varying around 33.3%. In Cassia fistula, the wax crystalloids were composed of clearly discernible irregular platelets (rosettes of platelets) as per terminology of Barthlott et al. (1998) – also known as “Faballes” type.
D. Khan , M. Javed Zak. (2019) SEEDLING CHARACTERISTICS OF CASSIA FISTULA L. (CAESALPINIACEAE), , Volume 16, Issue1.
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