Intergeneric Hybrids in the Bothriochloininae

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Abstract
A comparative study of the morphological and cytological features of B. intermedia and D. annulatum show that these two species are both seg-mental allopolyploids with 2n = 40 chromosomes. The chromosomes of the two genomes of D. annulatum when present in the haploid condition will pair with each other; B. intermedia has a number of genes from D. annulatum incorporated into one genome. Reduced and unreduced gametes of B. intermedia can be fertilized by a normal gamete of D. undulatum to produce viable progeny.