| | 1. Petal blade channeled, ± wavy-margined, claw width = or > blade width at junction, blade flared to tip or not |
| G. flavescens |
| | 1' Petal blade not channeled, not wavy-margined, claw width << blade width at junction |
| |
| | 2. Flower parts ± erect; sepals generally greenish (rarely pinkish); petals generally white or pale yellow (rarely pinkish); pedicel in fruit 0.5–3(4) mm |
| G. lasiophylla |
| | 2' Flower parts spreading to ascending; sepals pink or purplish; petals pink or whitish with pink veins; pedicel in fruit (2)3–9 mm |
| G. lemmonii
|