| australia | | isoetes coromandelina subsp. macrotuberculata | subspecies | 5 | 0 |
| australia | | isoetes drummondii | species | 1 | 0 |
| brazil | mato grosso | isoetes panamensis | species | 5 | 0 |
| brazil | mato grosso do sul | isoetes panamensis | species | 1 | 0 |
| brazil | para | isoetes cangae | species | 65 | 0 |
| brazil | para | isoetes serracarajensis | species | 241 | 0 |
| brazil | rio de janeiro | isoetes martii | species | 7 | 0 |
| brazil | tocantins | isoetes panamensis | species | 3 | 0 |
| cambodia | kampong chhnang province | isoetes coromandelina subsp. coromandelina | subspecies | 4 | 0 |
| canada | | isoetes echinospora | species | 5 | 0 |
| canada | | isoetes maritima | species | 7 | 0 |
| canada | alberta | isoetes bolanderi | species | 6 | 0 |
| canada | alberta | isoetes occidentalis | species | 1 | 0 |
| canada | british columbia | isoetes bolanderi | species | 2 | 0 |
| canada | british columbia | isoetes echinospora | species | 2 | 0 |
| canada | british columbia | isoetes howellii | species | 10 | 0 |
| canada | british columbia | isoetes maritima | species | 11 | 0 |
| canada | british columbia | isoetes minima | species | 4 | 0 |
| canada | british columbia | isoetes nuttallii | species | 6 | 0 |
| canada | british columbia | isoetes occidentalis | species | 4 | 0 |
| canada | british columbia | isoetes tenella | species | 1 | 0 |
| canada | new brunswick | isoetes echinospora | species | 2 | 0 |
| canada | new brunswick | isoetes riparia | species | 2 | 0 |
| canada | newfoundland and labrador | isoetes echinospora | species | 2 | 0 |
| canada | newfoundland and labrador | isoetes lacustris | species | 2 | 0 |
| canada | newfoundland and labrador | isoetes tuckermanii | species | 4 | 0 |
| canada | nova scotia | isoetes acadiensis | species | 4 | 0 |
| canada | nova scotia | isoetes echinospora | species | 2 | 0 |
| canada | nova scotia | isoetes prototypus | species | 4 | 0 |
| canada | nova scotia | isoetes tuckermanii | species | 5 | 0 |
| canada | ontario | isoetes echinospora | species | 5 | 0 |
| canada | ontario | isoetes engelmannii | species | 6 | 0 |
| canada | ontario | isoetes lacustris | species | 3 | 0 |
| canada | ontario | isoetes riparia | species | 3 | 0 |
| canada | ontario | isoetes tuckermanii | species | 1 | 0 |
| canada | quebec | isoetes echinospora | species | 2 | 0 |
| canada | yukon | isoetes echinospora | species | 4 | 0 |
| canada | yukon | isoetes maritima | species | 6 | 0 |
| canada | yukon | isoetes occidentalis | species | 2 | 0 |
| china | | isoetes hypsophila | species | 2 | 0 |
| china | | isoetes orientalis | species | 2 | 0 |
| china | | isoetes sinensis | species | 2 | 0 |
| china | | isoetes taiwanensis | species | 2 | 0 |
| china | | isoetes yunguiensis | species | 2 | 0 |
| china | guizhou | isoetes yunguiensis | species | 498 | 0 |
| china | yunnan | isoetes yunguiensis | species | 3 | 0 |
| costa rica | | isoetes storkii | species | 3 | 0 |
| greenland | | isoetes echinospora | species | 1 | 0 |
| greenland | | isoetes lacustris | species | 7 | 0 |
| india | | isoetes coromandelina | species | 1 | 0 |
| india | | isoetes coromandelina subsp. coromandelina | subspecies | 1 | 0 |
| india | karnataka | isoetes dixitei | species | 19 | 0 |
| india | mizoram | isoetes dixitei | species | 18 | 0 |
| india | rajasthan | isoetes coromandelina subsp. coromandelina | subspecies | 1 | 0 |
| india | rio grande do norte | isoetes dixitei | species | 16 | 0 |
| italy | | isoetes duriei | species | 2 | 0 |
| italy | | isoetes gymnocarpa | species | 2 | 0 |
| italy | | isoetes histrix | species | 1 | 0 |
| italy | | isoetes longissima | species | 6 | 0 |
| italy | | isoetes malinverniana | species | 2 | 0 |
| japan | | isoetes pseudojaponica | species | 1 | 0 |
| sri lanka | northern province | isoetes coromandelina subsp. coromandelina | subspecies | 27 | 0 |
| sweden | | isoetes echinospora | species | 1 | 0 |
| taiwan | taipei municipality | isoetes taiwanensis | species | 1 | 0 |
| united kingdom | | isoetes echinospora | species | 2 | 0 |
| united states | | isoetes bolanderi | species | 1 | 0 |
| united states | | isoetes butleri | species | 3 | 0 |
| united states | | isoetes chapmanii | species | 3 | 0 |
| united states | | isoetes echinospora | species | 3 | 0 |
| united states | | isoetes engelmannii | species | 3 | 0 |
| united states | | isoetes flaccida | species | 3 | 0 |
| united states | | isoetes lithophila | species | 3 | 0 |
| united states | | isoetes mattaponica | species | 2 | 0 |
| united states | | isoetes melanopoda | species | 3 | 0 |
| united states | | isoetes melanopoda subsp. silvatica | subspecies | 3 | 0 |
| united states | | isoetes melanospora | species | 3 | 0 |
| united states | | isoetes mississippiensis | species | 2 | 0 |
| united states | | isoetes nuttallii | species | 1 | 0 |
| united states | | isoetes occidentalis | species | 10 | 0 |
| united states | | isoetes piedmontana | species | 3 | 0 |
| united states | | isoetes tegetiformans | species | 3 | 0 |
| united states | | isoetes valida | species | 2 | 0 |
| united states | california | isoetes occidentalis | species | 2 | 0 |
| united states | oregon | isoetes howellii | species | 2 | 0 |