| | 1. Leaflet narrowly oblanceolate to narrowly elliptic, length generally 5 × width, margins rolled under; banner silky-hairy |
| G. linifolia |
| | 1' Leaflet oblanceolate or obovate to elliptic or ± round, length generally < 5 × width, margins flat; banner generally glabrous or nearly so |
| |
| | 2. Leaflet < 10 mm, length 1–2 × width; banner glabrous except generally for ± V-shaped hairy area from base to tip |
| G. canariensis |
| | 2' Leaflet generally > 10 mm, length 2–5 × width; banner glabrous or hairy only on midrib |
| |
| | 3. Stipules persistent, giving older twigs scaly appearance; twigs generally dull-yellow-brown-hairy |
| G. maderensis |
| | 3' Stipules deciduous; twigs silvery-hairy, at least when young |
| |
| | 4. Leaflet generally < 15 mm, length ± 2 × width; petiole < 5 mm; terminal or central flower of cluster generally opening last; banner glabrous |
| G. monspessulana |
| | 4' Leaflet generally > 15 mm, length ± 3 × width; petiole > 5 mm; terminal flower of raceme generally opening first; banner glabrous or ± hairy only on midrib |
| G. stenopetala
|