5. Lamina Architecture (Table 20, Plate XXVI)
i. Primary Vein Category: Campylodromous type in four out of the studied taxa viz. Bauhinia alba, B. hookeri, B. variegata & Cercis chinensis or pinnate type in the remaining of the studied taxa. The former type is considered unique character for Bauhina & Cercis. This is in accordance with the conclusion reached before by Bentham & Hooker (1862), Post (1932), Emberger (1960), Engler (1964), Willis (1966), Brenan (1967), Hutchinson (1967), Pettigrew & Watson (1977), Smith (1977), Polhill & Raven (1983), Watson & Dalwitz (1983) and Lewis et al. (2005) where the studied Bauhinia sp. and Cercis chinensis are grouped under Bauhinieae or Cercidieae.
ii. Secondary Vein Category: Poorly developed in Parkinsonia aculeata; cladodromous in Haematoxylum campecianum & Gleditsia caspica; brochidodromous in Bauhinia alba, B. hookeri & B. variegata or festooned brochidodromous in the rest of the studied taxa. The festooned brochidodromous type segregates Cercis chinensis away from the studied Bauhinia sp. and supported the division of tribe Cercideae or Bauhinieae into two subtribes, Cercidinae and Bauhiniinae by Wunderlin et al. (1981; 1987).
iii. Basal Vein Number: One in Parkinsonia aculeata; two in Caesalpinia ferrea, C. gilliessii & Delonix regia; three in 12 taxa; four in Peltophorum africanum & Senna alata; five in Cassia grandis; six in Senna surattensis; seven in Cercis chinensis; 11 in Haematoxylum campecianum; 13 in Bauhinia alba & B. variegata or 14 in B. hookeri.
iv. Secondary Vein Spacing: Uniform in eight out of the studied taxa or irregular in the rest.
v. Tertiary Vein Category: Poorly developed in Delonix regia & Parkinsonia aculeata; dichotomizing in Caesalpinia ferrea; alternate percurrent in Bauhinia alba, B. variegata, Saraca indica & Senna alata or random reticulate in the remainder.
vi. Tertiary Vein Course: Sinuous in Saraca indica; straight in Bauhinia alba & B. variegata; admedially ramified in Caesalpinia ferrea, C. gilliessii & Senna alata or exmedially ramified in the rest.
vii. Tertiary Vein Angle: Obtuse in 13 studied taxa or acute in the rest.
viii. Quaternary Vein Category: Alternate percurrent in Bauhinia alba & B. variegata; dichotomizing in B. hookeri, Cassia marginata, C. nodosa, Senna surattensis & Tamarindus indica; poorly developed in Caesalpinia ferrea, C. gilliessii, Delonix regia & Parkinsonia aculeata or regular polygonal reticulate in the rest.
ix. Areolation: Absent in Caesalpinia ferrea, Delonix regia & Parkinsonia aculeata; poorly developed in Cassia marginata & C. nodosa; moderately developed in Caesalpinia gilliesii or highly developed in the remaining studied taxa.
x. Freely Ending Veins: Absent in 11 taxa; unbranched in Bauhinia hookeri & Brownea grandiceps; once branching in Cassia fistula & Haematoxylum campecianum or two or more branching in the rest of the taxa studied.
xi. Marginal Ultimate Venation: Absent in Delonix regia & Parkinsonia aculeata; fimbrial in Bauhinia alba & B. variegata or looped in the rest.
i. Primary Vein Category: Campylodromous type in four out of the studied taxa viz. Bauhinia alba, B. hookeri, B. variegata & Cercis chinensis or pinnate type in the remaining of the studied taxa. The former type is considered unique character for Bauhina & Cercis. This is in accordance with the conclusion reached before by Bentham & Hooker (1862), Post (1932), Emberger (1960), Engler (1964), Willis (1966), Brenan (1967), Hutchinson (1967), Pettigrew & Watson (1977), Smith (1977), Polhill & Raven (1983), Watson & Dalwitz (1983) and Lewis et al. (2005) where the studied Bauhinia sp. and Cercis chinensis are grouped under Bauhinieae or Cercidieae.
ii. Secondary Vein Category: Poorly developed in Parkinsonia aculeata; cladodromous in Haematoxylum campecianum & Gleditsia caspica; brochidodromous in Bauhinia alba, B. hookeri & B. variegata or festooned brochidodromous in the rest of the studied taxa. The festooned brochidodromous type segregates Cercis chinensis away from the studied Bauhinia sp. and supported the division of tribe Cercideae or Bauhinieae into two subtribes, Cercidinae and Bauhiniinae by Wunderlin et al. (1981; 1987).
iii. Basal Vein Number: One in Parkinsonia aculeata; two in Caesalpinia ferrea, C. gilliessii & Delonix regia; three in 12 taxa; four in Peltophorum africanum & Senna alata; five in Cassia grandis; six in Senna surattensis; seven in Cercis chinensis; 11 in Haematoxylum campecianum; 13 in Bauhinia alba & B. variegata or 14 in B. hookeri.
iv. Secondary Vein Spacing: Uniform in eight out of the studied taxa or irregular in the rest.
v. Tertiary Vein Category: Poorly developed in Delonix regia & Parkinsonia aculeata; dichotomizing in Caesalpinia ferrea; alternate percurrent in Bauhinia alba, B. variegata, Saraca indica & Senna alata or random reticulate in the remainder.
vi. Tertiary Vein Course: Sinuous in Saraca indica; straight in Bauhinia alba & B. variegata; admedially ramified in Caesalpinia ferrea, C. gilliessii & Senna alata or exmedially ramified in the rest.
vii. Tertiary Vein Angle: Obtuse in 13 studied taxa or acute in the rest.
viii. Quaternary Vein Category: Alternate percurrent in Bauhinia alba & B. variegata; dichotomizing in B. hookeri, Cassia marginata, C. nodosa, Senna surattensis & Tamarindus indica; poorly developed in Caesalpinia ferrea, C. gilliessii, Delonix regia & Parkinsonia aculeata or regular polygonal reticulate in the rest.
ix. Areolation: Absent in Caesalpinia ferrea, Delonix regia & Parkinsonia aculeata; poorly developed in Cassia marginata & C. nodosa; moderately developed in Caesalpinia gilliesii or highly developed in the remaining studied taxa.
x. Freely Ending Veins: Absent in 11 taxa; unbranched in Bauhinia hookeri & Brownea grandiceps; once branching in Cassia fistula & Haematoxylum campecianum or two or more branching in the rest of the taxa studied.
xi. Marginal Ultimate Venation: Absent in Delonix regia & Parkinsonia aculeata; fimbrial in Bauhinia alba & B. variegata or looped in the rest.
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