6. Lamina Epidermal Characteristics (Table 21 & Plate XXVII; XXVIII; LM)
i. Cell Shape: Abaxial epidermis; quadrangular, polygonal, pentagonal, hexagonal in ten studied taxa or irregular in 15 taxa. Adaxial epidermis; quadrangular, polygonal, pentagonal, hexagonal in 18 studied taxa or irregular in seven taxa.
ii. Anticlinal Wall: Abaxial epidermis; straight in eight studied taxa; sinuous in Caesalpinia gilliesii, Brownea grandiceps & Saraca indica; slightly curved in seven studied taxa or curved in the remaining taxa. Adaxial epidermis; Sinuous in Brownea grandiceps, Caesalpinia gilliesii, Cassia fistula & Saraca indica; curved in Parkinsonia aculeate, & S. sophera or slightly curved in Caesalpinia ferrea, Cassia marginata, C. nodosa & Senna alata or straight in the remainder.
iii. Trichome Type: Abaxial epidermis; wanting in 11 taxa; unicellular in 13 taxa or bicellular in Peltophorum africanum. Adaxial epidermis; wanting in 13 out of the studied taxa or unicellular in the rest.
iv. Stomata Type: Paracytic, isotricytic & tetracytic in Bauhinia alba, B. hookeri & B. variegata; cyclocytic in Gleditsia caspica & Schotia brachypetala; anomocytic in Caesalpinia ferrea & C. gilliesii or paracytic in the remaining studied taxa. The taxa under investigation vary between hypostomatic lamina (15 taxa) or amphistomatic lamina (ten taxa). In this respect this character shared in the presnt study in separation of Cassia species (hypostomatic) away from Senna species (amphistomatic). This is in accordance with Bentham (1871), Taubert (1891) and Randell (1976) who segregated genus Cassia into three subgenera viz. Fistula, Senna and Lasiorhegma or subgenera viz. Cassia, Senna and respectively.
v. Shape: Abaxial epidermis; circular in four out of the studied taxa viz. Parkinsonia aculeate, Schotia brachypetala, Senna surattensis & Tamarindus indica; oblong-elliptic in Haematoxylum campecianum or elliptic in the remaining studied taxa. Adaxial epidermis; circular in Parkinsonia aculeata, Peltophorum africanum & Senna surattensis and elliptic in the remainders.
vi. Crystals: Abaxial epidermis; wanting in ten studied taxa; irregular in Ceratonia siliqua, Cercis chinensis & Schotia brachypetala; druses or/and prisms in the remaining studied taxa. Adaxial epidermis; wanting in ten studied taxa; irregular in Ceratonia siliqua, Cercis chinensis, Schotia brachypetala & Tamarindus indica; druses or/and prisms in the remaining studied taxa.
i. Cell Shape: Abaxial epidermis; quadrangular, polygonal, pentagonal, hexagonal in ten studied taxa or irregular in 15 taxa. Adaxial epidermis; quadrangular, polygonal, pentagonal, hexagonal in 18 studied taxa or irregular in seven taxa.
ii. Anticlinal Wall: Abaxial epidermis; straight in eight studied taxa; sinuous in Caesalpinia gilliesii, Brownea grandiceps & Saraca indica; slightly curved in seven studied taxa or curved in the remaining taxa. Adaxial epidermis; Sinuous in Brownea grandiceps, Caesalpinia gilliesii, Cassia fistula & Saraca indica; curved in Parkinsonia aculeate, & S. sophera or slightly curved in Caesalpinia ferrea, Cassia marginata, C. nodosa & Senna alata or straight in the remainder.
iii. Trichome Type: Abaxial epidermis; wanting in 11 taxa; unicellular in 13 taxa or bicellular in Peltophorum africanum. Adaxial epidermis; wanting in 13 out of the studied taxa or unicellular in the rest.
iv. Stomata Type: Paracytic, isotricytic & tetracytic in Bauhinia alba, B. hookeri & B. variegata; cyclocytic in Gleditsia caspica & Schotia brachypetala; anomocytic in Caesalpinia ferrea & C. gilliesii or paracytic in the remaining studied taxa. The taxa under investigation vary between hypostomatic lamina (15 taxa) or amphistomatic lamina (ten taxa). In this respect this character shared in the presnt study in separation of Cassia species (hypostomatic) away from Senna species (amphistomatic). This is in accordance with Bentham (1871), Taubert (1891) and Randell (1976) who segregated genus Cassia into three subgenera viz. Fistula, Senna and Lasiorhegma or subgenera viz. Cassia, Senna and respectively.
v. Shape: Abaxial epidermis; circular in four out of the studied taxa viz. Parkinsonia aculeate, Schotia brachypetala, Senna surattensis & Tamarindus indica; oblong-elliptic in Haematoxylum campecianum or elliptic in the remaining studied taxa. Adaxial epidermis; circular in Parkinsonia aculeata, Peltophorum africanum & Senna surattensis and elliptic in the remainders.
vi. Crystals: Abaxial epidermis; wanting in ten studied taxa; irregular in Ceratonia siliqua, Cercis chinensis & Schotia brachypetala; druses or/and prisms in the remaining studied taxa. Adaxial epidermis; wanting in ten studied taxa; irregular in Ceratonia siliqua, Cercis chinensis, Schotia brachypetala & Tamarindus indica; druses or/and prisms in the remaining studied taxa.
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