K
- Kalmia latifolia (N)
- Kerria japonica (I)
- Kickxia elatine (I)
- Kickxia spuria (I)
- Koeleria macrantha (N)
- Koelreuteria paniculata (I)
- Krigia biflora var. biflora (N)
- Krigia dandelion (N)
- Krigia virginica (N)
- Kummerowia stipulacea (I)
- Kummerowia striata (I)
- Kyllinga pumila (N)
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