| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Primulaceae | Steironema ciliatum | Fringed Loosestrife | Mesic forests, especially bottomlands and coves dominated by hardwoods. | NL (Newfoundland) west to AK, south to GA, Panhandle FL, AL, MS, AR, KS, NE, CO, NM, UT, ID, and OR. |  |
| Primulaceae | Steironema gramineum | Grassleaf Yellow-loosestrife | Endemic to ne. AL (Little River Canyon area) and Floyd County, GA. |  | |
| Primulaceae | Steironema hybridum | Lowland Loosestrife | Mesic hardwood forests, sinkhole and depression ponds, wet meadows, other wet areas. | ME and s. QC west to AB and WA, south irregularly to ne. FL, Panhandle FL, AR, NE, and AZ. |  |
| Primulaceae | Steironema lanceolatum | Lanceleaf Loosestrife | Mesic to relatively dry forests, mafic and calcareous fens, bogs, forest edges, roadbanks, primarily on circumneutral soils. | NJ, PA, OH, MI, and WI south to GA, Panhandle FL, AL, MS, LA, and ne. TX. |  |
| Primulaceae | Steironema lewisii | Lewis’s Loosestrife | Dry oak-hickory woodlands on ridges and upper slopes in dry, cherty, acid soils. | Endemic to Lewis and Maury counties, TN and Blount County, AL. | |
| Primulaceae | Steironema quadriflorum | Smooth Loosestrife, Four-flowered Loosestrife | Wet meadows and calcareous fens, stream banks, prairie meadows. | MA, s. ON, MI, and ND south to w. VA, WV, nw. GA, AL, and AR; mainly north and west of the Ohio River, very rare and scattered in or east of the Appalachians. Reported for c. NC by Coffey & Jones (1980), based on 2 specimens; the records seem unlikely. |  |
| Primulaceae | Steironema radicans | Trailing Loosestrife | Moist forests, swamps, marshes, eastwards in mountain sinkhole ponds and interdunal ponds. | The main distribution of this species is in the Mississippi Embayment, from MO and w. TN south to MS, AR, LA, and e. TX; disjunct occurrences in e. and w. VA and e. NC are curious. |  |
| Primulaceae | Steironema tonsum | Southern Loosestrife, Appalachian Loosestrife | Moist to dry upland forests, especially over calcareous or mafic rocks. | Sc. VA, sw. VA, and KY south to SC, wc. GA, and e. TN. The range is centered on the Southern Appalachians, but the species is essentially absent from the higher mountains – a "doughnut range". |
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