| D |
| Dahlia hortensis, Dahlia hybrids |
| Dahlia, Dahlia |
| Danae racemosa, Alexandrian laurel; Poet's laurel |
| Daphne caucasia, Caucasian daphne |
| Daphne genkwa, Lilac daphne |
| Daphne odora, Winter daphne; Fragrant daphne |
| Daphne phyllum macropodum, -- |
| Daphne retusa, -- |
| Daphne x burkwoodi, Burkwood daphne |
| Daphne x burkwoodii 'Carole Mackie', Carole Mackie daphne |
| Daphne x mantensiana, -- |
| Datura innoxia, Downy thorn apple |
| Datura metal, Angels Trumpet; Datura; Horn-of-plenty |
| Daucus carota, Queen Anne's lace; Wild carrot |
| Davidia involucrata, Dove tree |
| Decumaria barbara, Climbing hydrangea |
| Delosperma cooperi, Cooper's hardy ice plant |
| Delosperma cooperi, Hardy ice plant |
| Delosperma nubigena, Hardy ice plant; Cloud-loving hardy ice plant |
| Delosperma sutherlandii, -- |
| Delphinium cultivars, Delphinium |
| Delphinium exatatum, Tall larkspur |
| Delphinium spp., Larkspur |
| Delphinium tricorne, Dwarf larkspur; Spring larkspur |
| Dendranthema pacificum, Gold and silver chrysanthemum |
| Dennstaedtia punctiloba, Hay-scented fern; Boulder fern |
| Dentaria laciniata, Cut-leafed toothwort |
| Deparia acrostichoides; Athyrium thelpteroides, Silvery glade fern; Silvery spleenwort |
| Deschampsia cespitosa (Aira cespitosa), Tufted hair grass; Tussock grass |
| Desmodium nudiflorum, Naked-flowered tick trefoil |
| Deutzia 'Magician', Magician deutzia |
| Deutzia 'Pink Minor', Pink Minor deutzia |
| Deutzia 'Rosealind', Rosealind deutzia |
| Deutzia crenata, Deutzia |
| Deutzia gracilis, Slender deutzia |
| Deutzia ningpoensis, -- |
| Deutzia scabra, Fuzzy deutzia |
| Deutzia x lemoinei, Lemoine deutzia |
| Deutzia x rosea, Rose deutzia |
| Dianthus armeria, Deptford pink |
| Dianthus armeria, Deptford pink |
| Dianthus barbatus, Sweet William |
| Dianthus chinensis x barbatus, Hybrid pinks |
| Dianthus chinensis, Dianthus; Pinks |
| Dianthus deltoides, Maiden pink |
| Dianthus plumarius, Pinks; Dianthus |
| Dianthus spp., Pinks |
| Diascia barberae, Barber's diascia; Twinspur |
| Diascia intergerrima, Twinspur |
| Dicentra spp., Bleeding-heart; Dutchman's breeches |
| Dicentra canadensis, Squirrel corn |
| Dicentra cucullaria, Dutchman's breeches |
| Dicentra exima, Wild bleeding heart; Plumy bleeding heart |
| Dicentra eximia, Fringed bleeding heart |
| Dicentra spectabilis, Bleeding heart |
| Dichichium colorata, Star grass |
| Dichromena latifolia, White bracted sedge |
| Dictamnus albus, Gas plant |
| Diervilla sessilifolia, Bush honeysuckle |
| Diervilla sessilifolia, Southern bush honeysuckle |
| Dietes, Fortnight lily; African iris; Butterfly iris |
| Digitalis obscura, Dusty foxglove; Willow leaf foxglove |
| Digitalis purpurea, Foxglove |
| Diodia virginiana, Buttonweed |
| Dionaea muscipula, Venus' flytrap; Meadow clams |
| Dionaea muscipula, Venus flytrap |
| Diospyros khaki, Japanese persimmon |
| Diospyros virginiana, Persimmon |
| Dipelta floribunda, Rosy dipelta |
| Diphylleia cymosa, Umbrella-leaf |
| Diplazium pycnocarpon; Athyrium pycnocarpon, Glade fern; Narrow leaf spleenwort |
| Disanthus ceridifolius, Disanthus |
| Disporum maculatum, Nodding mandarin; Spotted disporum |
| Dodecatheon meadia, Shooting stars |
| Dolichos lablab, Hyacinth bean; Indian bean |
| Doronicum spp., Leopard's bane |
| Drosera spp., Sundew |
| Drosera filiformis; D. rotundifolia;
D. intermedia; D. capillaris, Sundew |
| Dryopteris affinis, Golden-scaled male fern |
| Dryopteris carthusiana, Toothed wood fern; Spinulose wood fern; Shield fern |
| Dryopteris celsa, Log fern |
| Dryopteris cristata, Crested wood fern; Narrow swamp fern |
| Dryopteris dilatata, Broad wood fern |
| Dryopteris erythrosora, Autumn fern; Shaggy shield fern |
| Dryopteris filix-mas 'Cristata', Crested male fern |
| Dryopteris filix-mas, Male fern |
| Dryopteris goldiana, Goldie's wood fern; Giant wood fern; Goldie's fern |
| Dryopteris intermedia; Dryopteris spinulosa var. intermedia, Intermediate shield fern; Evergreen wood fern; Fancy fern |
| Dryopteris marginalis, Marginal woodfern; Leather wood fern; Evergreen woodfern |
| Dryopteris sieboldii, Siebold's wood fern |
| Dryopteris villarii, Rigid buckler fern |
| Dryopteris wallichiana, Wallich's wood fern |
| Dryopteris x australis, Dixie wood fern |
| Duchesnea indica, Indian strawberry |
| Duranta erecta, Pigon berry |
| Dyssodia tenuiloba, Dahlberg daisy; Golden fleece |