Chromosome rearrangements in Aeschynomene americana var. glandulosa (2n = 20). A–H Prometaphase. Chromosomal segments whose position suggests participation of the NOR function. The long arrows point to segments aligned or joined to the chromosomal arms by chromatin strands or embedded in one or two nucleoli (N) or in traces thereof. The short arrows highlight small isolated spherical structure. I Metaphase. The participation of the chromosomal segments decreases or ceases and only an isolated spherical structure is observed within the nucleus. The arrowhead points to a chromosomal fragment. Scale bars: 10 μm.