Anthers 1-locular; lateral vegetative branches with or without basal cataphylls; flowers usually in 1 or 3 series above each fertile bract; if squamate, stems terete
Anthers 2-locular; lateral vegetative branches nearly always with basal cataphylls; flowers in 2 or more series above each fertile bract; if squamate, stems flattened or conspicuously keeled
