1. Sterile base of the spike about twice as long as the fertile part; floral bracts 50 mm long. var carnosa.
1. Sterile base of the spike shorter than the fertile part;
2. Floral bracts 30 mm long remaining imbricate after anthesis. Sepals 25mm long var brevistipitata
2. Floral bracts 35-40 mm long, spreading after anthesis. Sepals 30mm long var longispicata
2. Floral bracts 45mm long, Sepals 30mm long var. boliviensis —SeeSmith & Downs 1977