Abstract
SummaryZardini E. M., Peng, C.‐I & Hoch, P. C.: Chromosome numbers in Ludwigia sect Oligospermum and sect. Oocarpon (Onagraceae). ‐ Taxon 40: 221–230. 1991. ‐ ISSN 0040‐0262.Chromosome numbers are reported from all nine species (12 taxa) of Ludwigia sect. Oligospermum and sect. Oocarpon, including three not reported previously: L. hookeri (2n = 32), L. peduncularis (2n = 32), both of L. sect. Oligospermum, and L. torulosa (2n = 16) of the monotypic L. sect. Oocarpon. An earlier count of n = 8 for L. hookeri was based on a mis‐identified specimen of L. peploides. Counts are also reported for three naturally occurring hybrids. Chromosome counts from a total of 141 strains are included, with full voucher information for each. New data are compared with all previous reports for the species of these sections.
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