3.1. Key to the G. namaquensis group

½ Leaves ± plane with narrowly winged, ciliate margins and veins; stem ± puberulous; flowers blue to violet; filaments equal]

1a Perianth tube 18–25 mm long; filaments 8–10 mm long… G. kamiesmontana

1b Perianth tube 6–11 mm long; filaments 4–6 mm long

2a Tepals 14–18 × 3–6 mm; anthers 4.5–7.0 mm long; style branches ± 2 mm long… G. namaquensis

2b Tepals (6–)8–10 × 1.5–2.0 mm; anthers 2–3 mm long; style branches ± 1 mm long… G. namaquamontana