Pochards and allies
Marbled Duck and White-winged Duck have both previously been treated as belonging to different subfamilies but are apparently now thought to be more closely affiliated with the pochards.
Marbled Duck Marmaronetta angustirostris
White-winged Duck Asarcornis scutulata
Red-crested Pochard Netta rufina
Southern Pochard Netta erythrophthalma
Rosy-billed Pochard Netta peposaca
Ferruginous Duck Aythya nyroca
Baer's Pochard Aythya baeri
Hybrid: Feruginous Duck Aythya nyroca x Baer's Pochard Aythya baeri
Common Pochard Aythya ferina
Hybrid: Rosy-billed Pochard Netta peposaca x Common Pochard Aythya ferina
Hybrid: Ferruginous Duck Aythya nyroca x Common Pochard Aythya ferina
Canvasback Aythya valisineria
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This as far as I've got systematically - more to follow soon.
Hybrid: Red-crested Pochard Netta rufina x Tufted Duck Aythya fuligula