Key to the series of Dipcadi

1a. Outer tepals with short or long caudate apical appendages ........................................................................... Dipcadi ser. Uropetalon

1b. Outer tepals without caudate apical appendages ............................................................................................................................... 2.

2a. Flowers pure white; brownish–black seeds ............................................................................................... Dipcadi ser. Bruno-niveus

2b. Flowers other than white (sometimes pure white); shiny black seeds ............................................................... Dipcadi ser. Dipcadi