J
- Jacquemontia tamnifolia (N)
- Jeffersonia diphylla (N)
- Juglans cinerea (N)
- Juglans nigra (N)
- Juncus acuminatus (N)
- Juncus alpinoarticulatus ssp. nodulosus (N)
- Juncus anthelatus (N)
- Juncus arcticus ssp. littoralis (N)
- Juncus articulatus (N)
- Juncus biflorus (N)
- Juncus brachycarpus (N)
- Juncus brachycephalus (N)
- Juncus bufonius var. bufonius (N)
- Juncus canadensis (N)
- Juncus compressus (I)
- Juncus dichotomus (N)
- Juncus diffusissimus (N)
- Juncus dudleyi (N)
- Juncus effusus var. decipiens (N)
- Juncus effusus var. pylaei (N)
- Juncus effusus var. solutus (N)
- Juncus gerardii var. gerardii (N)
- Juncus greenei (N)
- Juncus interior var. interior (N)
- Juncus marginatus (N)
- Juncus nodosus var. nodosus (N)
- Juncus secundus (N)
- Juncus × stuckeyi (N)
- Juncus subcaudatus var. subcaudatus (N)
- Juncus tenuis (N)
- Juncus torreyi (N)
- Juniperus communis var. depressa (N)
- Juniperus virginiana var. virginiana (N)
- Justicia americana (N)
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