D
- Dactylis glomerata ssp. glomerata (I)
- Dactyloctenium aegyptium (I)
- Dactylorhiza viridis (N)
- Dalea leporina (N)
- Dalea purpurea var. purpurea (N)
- Dalibarda repens (N)
- Danthonia compressa (N)
- Danthonia spicata (N)
- Daphne mezereum (I)
- Dasiphora fruticosa ssp. floribunda (N)
- Dasistoma macrophylla (N)
- Datura stramonium (I)
- Datura wrightii (N)
- Daucus carota (I)
- Decodon verticillatus (N)
- Delphinium exaltatum (N)
- Delphinium tricorne (N)
- Dennstaedtia punctilobula (N)
- Deparia acrostichoides (N)
- Deschampsia cespitosa (N)
- Deschampsia danthonioides (N)
- Deschampsia flexuosa var. flexuosa (N)
- Descurainia pinnata ssp. brachycarpa (N)
- Descurainia sophia (I)
- Desmanthus illinoensis (N)
- Desmodium canadense (N)
- Desmodium canescens (N)
- Desmodium ciliare var. ciliare (N)
- Desmodium cuspidatum var. cuspidatum (N)
- Desmodium cuspidatum var. longifolium (N)
- Desmodium glutinosum (N)
- Desmodium illinoense (N)
- Desmodium laevigatum (N)
- Desmodium marilandicum (N)
- Desmodium nudiflorum (N)
- Desmodium obtusum (N)
- Desmodium paniculatum var. paniculatum (N)
- Desmodium pauciflorum (N)
- Desmodium perplexum (N)
- Desmodium rotundifolium (N)
- Desmodium sessilifolium (N)
- Desmodium viridiflorum (N)
- Dianthus armeria (I)
- Dianthus barbatus (I)
- Dianthus deltoides (I)
- Dianthus plumarius (I)
- Diarrhena americana (N)
- Diarrhena obovata (N)
- Dicentra canadensis (N)
- Dicentra cucullaria (N)
- Dicentra eximia (N)
- Dichanthelium acuminatum var. acuminatum (N)
- Dichanthelium acuminatum var. fasciculatum (N)
- Dichanthelium acuminatum var. lindheimeri (N)
- Dichanthelium boreale (N)
- Dichanthelium boscii (N)
- Dichanthelium clandestinum (N)
- Dichanthelium commutatum (N)
- Dichanthelium depauperatum (N)
- Dichanthelium dichotomum var. dichotomum (N)
- Dichanthelium latifolium (N)
- Dichanthelium laxiflorum (N)
- Dichanthelium leibergii (N)
- Dichanthelium linearifolium (N)
- Dichanthelium longiligulatum (N)
- Dichanthelium meridionale (N)
- Dichanthelium oligosanthes var. oligosanthes (N)
- Dichanthelium oligosanthes var. scribnerianum (N)
- Dichanthelium ovale var. addisonii (N)
- Dichanthelium sabulorum var. patulum (N)
- Dichanthelium sabulorum var. thinium (N)
- Dichanthelium sphaerocarpon var. isophyllum (N)
- Dichanthelium sphaerocarpon var. sphaerocarpon (N)
- Dichanthelium spretum (N)
- Dichanthelium villosissimum var. praecocius (N)
- Dichondra carolinensis (N)
- Diervilla lonicera (N)
- Digitalis grandiflora (I)
- Digitalis lanata (I)
- Digitalis lutea (I)
- Digitalis purpurea ssp. purpurea (I)
- Digitaria ciliaris (N)
- Digitaria cognata (N)
- Digitaria filiformis (N)
- Digitaria ischaemum (I)
- Digitaria sanguinalis (N)
- Diodia teres var. teres (N)
- Diodia virginiana var. virginiana (N)
- Dioscorea oppositifolia (I)
- Dioscorea quaternata (N)
- Dioscorea villosa (N)
- Diospyros virginiana (N)
- Diplazium pycnocarpon (N)
- Diplotaxis muralis (I)
- Diplotaxis tenuifolia (I)
- Dipsacus fullonum (I)
- Dipsacus laciniatus (I)
- Dipsacus sativus (I)
- Dirca palustris (N)
- Distichlis spicata (N)
- Dodecatheon meadia ssp. meadia (N)
- Doellingeria infirma (N)
- Doellingeria umbellata var. umbellata (N)
- Draba brachycarpa (N)
- Draba cuneifolia var. cuneifolia (N)
- Draba reptans (N)
- Draba verna (I)
- Dracocephalum parviflorum (N)
- Drosera intermedia (N)
- Drosera rotundifolia var. rotundifolia (N)
- Dryopteris × benedictii (N)
- Dryopteris × boottii (N)
- Dryopteris carthusiana (N)
- Dryopteris clintoniana (N)
- Dryopteris cristata (N)
- Dryopteris goldiana (N)
- Dryopteris intermedia (N)
- Dryopteris marginalis (N)
- Dryopteris × mickelii (N)
- Dryopteris × neowherryi (N)
- Dryopteris × pittsfordensis (N)
- Dryopteris × slossoniae (N)
- Dryopteris × triploidea (N)
- Dryopteris × uliginosa (N)
- Duchesnea indica (I)
- Dulichium arundinaceum var. arundinaceum (N)
- Dyssodia papposa (N)
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