| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
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| Lycopodiaceae | Dendrolycopodium dendroideum | Tree Groundpine, Round-branch Clubmoss, Prickly Tree-clubmoss | Openings, grassy balds, high elevation spruce-fir and northern hardwood forests. | The northernmost of the L. obscurum complex, ranging from n. QC and NL (Newfoundland) west to AK, south to s. NJ, w. NC, MO, MN, SD, CO, MT, ID, and WA. Petrewski (2020) found that plants previously attributed to D. dendroideum in e. Asia are not part of this species. | 
|
| Lycopodiaceae | Dendrolycopodium hickeyi | Delicate Tree-clubmoss, Pennsylvania Groundpine, Hickey's Tree-clubmoss | Grassy balds, bog margins, forest openings, acidic ridgetop forests. | N. QC and NL (Newfoundland) west to MN, south to NJ, sw. NC, and n. IN. | 
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| Lycopodiaceae | Dendrolycopodium obscurum | Common Groundpine, Flat-branched Tree-clubmoss | Acidic forests. | NS and NB west to MI and WI, south to n. GA, ne. AL, s. IN, n. IL (?), and c. MN; China, Japan, Korea, e. Russia. | 
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