| 1. Petals 38 mm; stigma beyond anthers (see also G. heterozygum) |
| |
| 2. Petals 48 mm; Sierra Nevada (s of Placer Co.) |
| G. eriospermum |
| 2' Petals 37 mm; Cascade Range, San Bernardino Mountains, Warner Mountains, n High Sierra Nevada (Plumas Co.) |
| G. diffusum subsp. diffusum |
| 1' Petals 0.53 mm; stigma not beyond anthers |
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| 3. Seeds ± 50% aborted; fruit very irregular, lumpy |
| G. heterozygum |
| 3' Seeds all maturing; fruit not irregular, slightly to very knobby |
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| 4. Fruit flat; plant generally branched only below, 2° branches 0few |
| |
| 5. Lateral fruit valves staying attached; petals 0.81.5 mm; larger stamens ± 0.7 mm |
| G. humile |
| 5' All fruit valves coming free; petals 1.31.8 mm; larger stamens 0.81.5 mm |
| G. racemosum |
| 4' Fruit ± not flat; plant branched only above to throughout, 2° branches generally many |
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| 6. Seeds in each chamber overlapped, generally in 2 rows |
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| 7. Petals 0.71.5 mm; pedicel generally > fruit |
| G. ramosissimum |
| 7' Petals 1.53 mm; pedicel generally < fruit |
| G. diffusum subsp. parviflorum |
| 6' Seeds in each chamber not overlapped, in 1 row |
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| 8. Seeds > 9, subopposite; fruit slightly knobby |
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| 9. Branches ± throughout, generally 28 nodes between |
| G. decipiens |
| 9' Branches at base or not, many above, generally 01 node between |
| G. diffusum subsp. parviflorum |
| 8' Seeds (1)39, generally alternate; fruit very knobby |
| |
| 10. Seeds 69; pedicel generally < fruit |
| G. diffusum subsp. parviflorum |
| 10' Seeds (1)35; pedicel ± = fruit |
| G. oligospermum
|