Abstract
Summary Both Sesbania aculeata and S. speciosa have binucleate, prolate, tricolpate pollen grains. The rate of pollen‐tube growth in vitro is higher in S. speciosa than in S. aculeata. The maximum pollen‐tube length for the former is 2151.5 μ and for the latter 1062.0 μ. The tubes continue to grow in culture for 8 hours. The tube‐nucleus generally precedes the generative cell, but sometimes follows it. The generative nucleus divides normally with regular equational division of its chromosomes. Spindle formation is clear, and the spindle can develop in any position in relation to the longitudinal axis of the pollen‐tube. Cytokinesis takes place by cell‐plate formation. Two sperms are formed. S. aculeata has twenty‐four chromosomes in somatic cells, and only one pair has secondary constrictions. Meiosis is regular, with rare multivalent formation. Although a polyploid race its behaviour is that of a diploid. S. speciosa has twelve chromosomes in somatic cells, and only one pair has secondary constrictions.
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