G
- Gaillardia pulchella var. pulchella (N)
- Galactia volubilis (N)
- Galanthus elwesii (I)
- Galanthus nivalis (I)
- Galax urceolata (N)
- Galearis spectabilis (N)
- Galeopsis bifida (I)
- Galeopsis ladanum var. ladanum (I)
- Galeopsis tetrahit var. tetrahit (I)
- Galinsoga parviflora (I)
- Galinsoga quadriradiata (I)
- Galium aparine (N)
- Galium asprellum (N)
- Galium boreale (N)
- Galium circaezans var. hypomalacum (N)
- Galium concinnum (N)
- Galium labradoricum (N)
- Galium lanceolatum (N)
- Galium mollugo (I)
- Galium obtusum ssp. obtusum (N)
- Galium odoratum (I)
- Galium palustre (N)
- Galium pilosum var. pilosum (N)
- Galium tinctorium (N)
- Galium trifidum ssp. trifidum (N)
- Galium triflorum (N)
- Galium verum var. verum (I)
- Gamochaeta purpurea (N)
- Gaultheria hispidula (N)
- Gaultheria procumbens (N)
- Gaura biennis (N)
- Gaura longiflora (N)
- Gaura mollis (N)
- Gaylussacia baccata (N)
- Genista tinctoria (I)
- Gentiana alba (N)
- Gentiana andrewsii var. andrewsii (N)
- Gentiana × billingtonii (N)
- Gentiana clausa (N)
- Gentiana puberulenta (N)
- Gentiana saponaria var. saponaria (N)
- Gentiana villosa (N)
- Gentianella quinquefolia ssp. occidentalis (N)
- Gentianopsis crinita (N)
- Gentianopsis virgata ssp. victorinii (N)
- Gentianopsis virgata ssp. virgata (N)
- Geranium bicknellii (N)
- Geranium carolinianum var. carolinianum (N)
- Geranium columbinum (I)
- Geranium dissectum (I)
- Geranium maculatum (N)
- Geranium molle (I)
- Geranium pusillum (I)
- Geranium robertianum (I)
- Geranium robertianum ssp. robertianum (N)
- Geranium sanguineum (I)
- Geum aleppicum (N)
- Geum canadense var. canadense (N)
- Geum laciniatum var. laciniatum (N)
- Geum rivale (N)
- Geum urbanum (I)
- Geum vernum (N)
- Geum virginianum (N)
- Gilia capitata ssp. capitata (N)
- Gillenia stipulata (N)
- Gillenia trifoliata (N)
- Gladiolus × gandavensis (I)
- Glandularia canadensis (N)
- Glandularia × hybrida (I)
- Glebionis segetum (I)
- Glechoma hederacea (I)
- Gleditsia triacanthos (N)
- Glyceria acutiflora (N)
- Glyceria borealis (N)
- Glyceria canadensis (N)
- Glyceria grandis var. grandis (N)
- Glyceria melicaria (N)
- Glyceria septentrionalis (N)
- Glyceria striata (N)
- Glycine max (I)
- Gnaphalium uliginosum (I)
- Gomphrena globosa (I)
- Goodyera pubescens (N)
- Goodyera repens (N)
- Goodyera tesselata (N)
- Gratiola neglecta (N)
- Gratiola virginiana var. virginiana (N)
- Gratiola viscidula (N)
- Grindelia lanceolata var. lanceolata (N)
- Grindelia squarrosa var. serrulata (N)
- Grindelia squarrosa var. squarrosa (N)
- Guizotia abyssinica (I)
- Gutierrezia texana var. texana (N)
- Gymnocarpium appalachianum (N)
- Gymnocarpium × brittonianum (N)
- Gymnocarpium dryopteris (N)
- Gymnocladus dioicus (N)
- Gymnopogon ambiguus (N)
- Gypsophila muralis (I)
- Gypsophila paniculata (I)
- Gypsophila scorzonerifolia (I)
Read more about this topic: Flora Of Ohio