- Geranium caeruleatum
- Geranium caespitosum – Pineywoods Geranium, Purple Cluster Geranium, Tufted Geranium
- Geranium caffrum
- Geranium californicum – California Cranesbill
- Geranium campanulatum
- Geranium campii
- Geranium canariense
- Geranium canescens
- Geranium canopurpureum
- Geranium × cantabrigiense (G. dalmaticum × G. maccrorrhizum)
- Geranium carmineum
- Geranium carolinianum – Carolina Cranesbill, Carolina Geranium
- Geranium cataractum
- Geranium caucense
- Geranium cazorlense
- Geranium chamaense
- Geranium chaparense
- Geranium charucanum
- Geranium chelikii
- Geranium chilense
- Geranium chimborazense
- Geranium chinchense
- Geranium chinense
- Geranium christensenianum
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- Geranium cinereum – Ashy Cranesbill
- Geranium cinereum var. cinereum
- Geranium cinereum var. subcaulescens
- Geranium clarkei – Clark's Geranium
- Geranium clarum
- Geranium collae
- Geranium collinum
- Geranium columbianum
- Geranium columbinum – Long-stalked Cranesbill
- Geranium comarapense
- Geranium commutatum
- Geranium confertum
- Geranium contortum
- Geranium core-core
- Geranium costaricense
- Geranium crassipes
- Geranium crassiusculum
- Geranium crenatifolium
- Geranium cruceroense
- Geranium cuatrecasasii
- Geranium cuchillense
- Geranium cuneatum – Silver Geranium, hinahina
- Geranium cuneatum ssp. cuneatum
- Geranium cuneatum ssp. hololeucum
- Geranium cuneatum ssp. hypoleucum
- Geranium cuneatum ssp. tridens
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