29 species are accepted. •
Gratiola amphiantha – pool sprite, snorkelwort (southeastern United States) •
Gratiola bogotensis – (Colombia, Ecuador, and norhwestern Venezuela) •
Gratiola brevifolia – sticky hedgehyssop (southeastern United States and Texas) •
Gratiola ebracteata – bractless hedgehyssop (western Canada and western United States) •
Gratiola floridana – Florida hedgehyssop (southeastern United States) •
Gratiola fluviatilis – (Japan) •
Gratiola graniticola – (Georgia and South Carolina) •
Gratiola griffithii – (Assam and Guangdong) •
Gratiola heterosepala – Boggs Lake hedgehyssop (California and Oregon) •
Gratiola hispida – pineland hedge-hyssop (southeastern United States) •
Gratiola japonica – (southern China, Korea, Japan, and Russian Far East) •
Gratiola linifolia – (Portugal and southwestern Spain) •
Gratiola lutea – golden hedgehyssop (southeastern Canada and north-central and eastern United States) •
Gratiola mauretanica – (Morocco) •
Gratiola nana – (southeastern Australia and New Zealand) •
Gratiola neglecta – clammy hedgehyssop (Canada and United States) •
Gratiola officinalis – common hedgehyssop (Europe, Morocco, Turkey, Caucasus, Iran, Pakistan, and Central Asia) •
Gratiola oresbia – (Mexico and Guatemala) •
Gratiola pedunculata – (southern and eastern Australia) •
Gratiola peruviana – Austral brooklime (South America and southern and eastern Australia) •
Gratiola pilosa – shaggy hedge-hyssop (south-central and southeastern United States) •
Gratiola pubescens – Hairy brooklime (southeastern Australia) •
Gratiola pumilo – (southern and eastern Australia) •
Gratiola quartermaniae – limestone hedgehyssop (southern Ontario, east-central United States, and Texas) •
Gratiola ramosa – branched hedgehyssop (southeastern United States) •
Gratiola sexdentata – (New Zealand) •
Gratiola torreyi – yellow hedgehyssop (Louisiana and Texas) •
Gratiola virginiana – roundfruit hedgehyssop (Central and eastern United States) •
Gratiola viscidula – Short's hedgehyssop (east-central and southeastern United States) ==Fossil record==