| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| DICA23 | Diploschistes canadensis Rasanen | Diploschistes muscorum ssp. muscorum | Thelotremataceae
|
| DICA30 | Diploschistes candidissimus (Krempelh.) Zahlbr. | crater lichen | Thelotremataceae
|
| DIDI13 | Diploschistes diacapsis (Ach.) Lumbsch | crater lichen | Thelotremataceae
|
| DIGY | Diploschistes gypsaceus (Ach.) Zahlbr. | crater lichen | Thelotremataceae
|
| DIHY3 | Diploschistes hypoleucus Zahlbr. | crater lichen | Thelotremataceae
|
| DIMUM | Diploschistes muscorum (Scop.) R. Sant. ssp. muscorum | crater lichen | Thelotremataceae
|
| DIMU7 | Diploschistes muscorum (Scop.) R. Sant. | crater lichen | Thelotremataceae
|
| DISC60 | Diploschistes scruposus (Schreber) Norman | crater lichen | Thelotremataceae
|
| DIST6 | Diploschistes straminescens Zahlbr. | Diploschistes hypoleucus | Thelotremataceae
|
| DIPLO5 | Diploschistes Norman | crater lichen | Thelotremataceae
|
| DIBE2 | Diplostelma bellioides Gray | Chaetopappa bellioides | Asteraceae
|
| DIER5 | Diplotaxis erucoides (L.) DC. | white wallrocket | Brassicaceae
|
| DIMU2 | Diplotaxis muralis (L.) DC. | annual wallrocket | Brassicaceae
|
| DISI8 | Diplotaxis siifolia Kuntze | | Brassicaceae
|
| DITE4 | Diplotaxis tenuifolia (L.) DC. | perennial wallrocket | Brassicaceae
|
| DIPLO | Diplotaxis DC. | wallrocket | Brassicaceae
|
| DIAL7 | Diplotomma alboatrum (Hoffm.) Flotow | diplotomma lichen | Physciaceae
|
| DIAM4 | Diplotomma ambiguum (Ach.) Flagey | diplotomma lichen | Physciaceae
|
| DICH9 | Diplotomma chlorophaeum (Hepp ex Leighton) Szat. | diplotomma lichen | Physciaceae
|
| DIEP | Diplotomma epipolium (Ach.) Arnold | diplotomma lichen | Physciaceae
|
| DINI3 | Diplotomma nivalis (Begl. & Carestia) Hafellner | diplotomma lichen | Physciaceae
|
| DIPE6 | Diplotomma penichrum (Tuck.) Szat. | diplotomma lichen | Physciaceae
|
| DIVE5 | Diplotomma venustum (Korber) Korber | diplotomma lichen | Physciaceae
|
| DIPLO7 | Diplotomma Flotow | diplotomma | Physciaceae
|
| DILI8 | Dipogon lignosus (L.) Verdc. | okie bean | Fabaceae
|
| DIPOG | Dipogon Lieb. | dipogon | Fabaceae
|
| DIFUF4 | Dipsacus fullonum L. ssp. fullonum | Fuller's teasel | Dipsacaceae
|
| DIFUS | Dipsacus fullonum L. ssp. sativus (L.) Thellung | Dipsacus sativus | Dipsacaceae
|
| DIFUS2 | Dipsacus fullonum L. ssp. sylvestris (Huds.) Clapham | Fuller's teasel | Dipsacaceae
|
| DIFU2 | Dipsacus fullonum L. | Fuller's teasel | Dipsacaceae
|
| DILA4 | Dipsacus laciniatus L. | cutleaf teasel | Dipsacaceae
|
| DISA9 | Dipsacus sativus (L.) Honckeny | Indian teasel | Dipsacaceae
|
| DISY | Dipsacus sylvestris Huds. | Dipsacus fullonum ssp. sylvestris | Dipsacaceae
|
| DIPSA | Dipsacus L. | teasel | Dipsacaceae
|
| DIDR2 | Dipteracanthus drummondianus Nees | Ruellia drummondiana | Acanthaceae
|
| DILI6 | Dipteracanthus linearis Torr. & Gray | Dyschoriste linearis | Acanthaceae
|
| DIMI4 | Dipteracanthus micranthus Engelm. & Gray | Ruellia strepens | Acanthaceae
|
| DINU2 | Dipteracanthus nudiflorus Engelm. & Gray | Ruellia nudiflora var. nudiflora | Acanthaceae
|
| DIST4 | Dipteracanthus strepens (L.) Nees | Ruellia strepens | Acanthaceae
|
| DIOD2 | Dipteryx odorata (Aublet) Willd. | tonka bean | Fabaceae
|
| DIOP2 | Dipteryx oppositifolia (Aublet) Willd. | Taralea oppositifolia | Fabaceae
|
| DIPTE | Dipteryx Schreber | dipteryx | Fabaceae
|
| DIOC3 | Dirca occidentalis Gray | western leatherwood | Thymelaeaceae
|
| DIPA9 | Dirca palustris L. | eastern leatherwood | Thymelaeaceae
|
| DIRCA | Dirca L. | leatherwood | Thymelaeaceae
|
| DIAPH | Dirina approximata Zahlbr. ssp. hioramii (de Lesd.) Tehler | Dirina paradoxa | Roccellaceae
|
| DICA24 | Dirina californica Tuck. | Sigridea californica | Roccellaceae
|
| DICA22 | Dirina catilinariae Hasse | | Roccellaceae
|
| DIFR3 | Dirina franciscana Zahlbr. ex Herre | Roccellina franciscana | Roccellaceae
|
| DIHA5 | Dirina hassei Zahlbr. | Sigridea californica | Roccellaceae
|
| DIPA15 | Dirina paradoxa (Fee) Tehler | | Roccellaceae
|
| DIRE11 | Dirina rediunta Hasse | Schismatomma rediunta | Opegraphaceae
|
| DIRIN | Dirina Fr. | dirina | Roccellaceae
|
| DIAE2 | Dirinaria aegialita (Afz.) B. Moore | | Physciaceae
|
| DIAP3 | Dirinaria applanata (Fee) D. D. Awasthi | | Physciaceae
|
| DIAS4 | Dirinaria aspera (H. Magn.) D. D. Awasthi | Dirinaria aegialita | Physciaceae
|
| DICO13 | Dirinaria confluens (Fr.) D. D. Awasthi | | Physciaceae
|
| DICOS | Dirinaria confusa D. D. Awasthi var. saxicola (Rasanen) D. D. Awasthi | | Physciaceae
|
| DICO14 | Dirinaria confusa D. D. Awasthi | | Physciaceae
|
| DIFR2 | Dirinaria frostii (Tuck.) Hale & Culb. | | Physciaceae
|
| DILE8 | Dirinaria leopoldii (Stein) D. D. Awasthi | | Physciaceae
|
| DIPA24 | Dirinaria papillulifera (Nyl.) D. D. Awasthi | | Physciaceae
|
| DIPI6 | Dirinaria picta (Sw.) Clem. & Schear | | Physciaceae
|
| DIPU6 | Dirinaria purpurascens (Vainio) B. Moore | | Physciaceae
|
| DIRIN2 | Dirinaria (Tuck.) Clem. | dirinaria | Physciaceae
|
| DIVA3 | Disaccanthus validus Greene | Streptanthus carinatus ssp. carinatus | Brassicaceae
|
| DINU5 | Discelium nudum (Dicks.) Brid. | discelium moss | Disceliaceae
|
| DISCE | Discelium Brid. | discelium moss | Disceliaceae
|
| DINU3 | Discopleura nuttallii DC. | Ptilimnium nuttallii | Apiaceae
|
| DIHOH | Disporum hookeri (Torr.) Nichols. var. hookeri | drops of gold | Liliaceae
|
| DIHOO | Disporum hookeri (Torr.) Nichols. var. oreganum (S. Wats.) Q. Jones | Oregon drops of gold | Liliaceae
|
| DIHOP | Disporum hookeri (Torr.) Nichols. var. parvifolium (S. Wats.) Britt. | drops of gold | Liliaceae
|
| DIHOT | Disporum hookeri (Torr.) Nichols. var. trachyandrum (Torr.) Q. Jones | drops of gold | Liliaceae
|
| DIHO3 | Disporum hookeri (Torr.) Nichols. | drops of gold | Liliaceae
|
| DILA5 | Disporum lanuginosum (Michx.) Nichols. | yellow fairybells | Liliaceae
|
| DIMA2 | Disporum maculatum (Buckl.) Britt. | yellow mandarin | Liliaceae
|
| DIOR2 | Disporum oreganum (S. Wats.) W. Mill. | Disporum hookeri var. oreganum | Liliaceae
|
| DIPA7 | Disporum parvifolium (S. Wats.) Britt. | Disporum hookeri var. parvifolium | Liliaceae
|
| DISM2 | Disporum smithii (Hook.) Piper | largeflower fairybells | Liliaceae
|
| DITR6 | Disporum trachyandrum (Torr.) Britt. | Disporum hookeri var. trachyandrum | Liliaceae
|
| DITRS | Disporum trachycarpum (S. Wats.) Benth. & Hook. f. var. subglabrum E.H. Kelso | Disporum trachycarpum | Liliaceae
|
| DITR2 | Disporum trachycarpum (S. Wats.) Benth. & Hook. f. | roughfruit fairybells | Liliaceae
|
| DISPO | Disporum Salisb. ex D. Don | fairybells | Liliaceae
|
| DICA5 | Dissanthelium californicum (Nutt.) Benth. | Catalina grass | Poaceae
|
| DISSA | Dissanthelium Trin. | Catalina grass | Poaceae
|
| DIBI2 | Dissochondrus biflorus (Hbd.) Kuntze ex Hack. | Hawai'i false bristlegrass | Poaceae
|
| DISSO | Dissochondrus (Hbd.) Kuntze | false brittlegrass | Poaceae
|
| DIRO2 | Dissotis rotundifolia (Sm.) Triana | pinklady | Melastomataceae
|
| DISSO2 | Dissotis Benth. | dissotis | Melastomataceae
|
| DICO9 | Distasis concinna Hook. & Arn. | Erigeron concinnus var. concinnus | Asteraceae
|
| DIIN5 | Distegia involucrata (Banks ex Spreng.) Cockerell | Lonicera involucrata var. involucrata | Caprifoliaceae
|
| DICAC3 | Distichium capillaceum (Hedw.) Bruch & Schimp. in B.S.G. var. capillaceum | distichium moss | Ditrichaceae
|
| DICAC4 | Distichium capillaceum (Hedw.) Bruch & Schimp. in B.S.G. var. curvatum Flow. | distichium moss | Ditrichaceae
|
| DICA29 | Distichium capillaceum (Hedw.) Bruch & Schimp. in B.S.G. | distichium moss | Ditrichaceae
|
| DIHA70 | Distichium hagenii Ryan ex Philib. | Hagen's distichium moss | Ditrichaceae
|
| DIIN70 | Distichium inclinatum (Hedw.) Bruch & Schimp. in B.S.G. | incline distichium moss | Ditrichaceae
|
| DISTI3 | Distichium Bruch & Schimp. in B.S.G. | distichium moss | Ditrichaceae
|
| DISPS4 | Distichlis spicata (L.) Greene ssp. stricta (Torr.) Thorne | Distichlis spicata | Poaceae
|
| DISPB | Distichlis spicata (L.) Greene var. borealis (J. Presl) Beetle | Distichlis spicata | Poaceae
|
| DISPD | Distichlis spicata (L.) Greene var. divaricata Beetle | Distichlis spicata | Poaceae
|
| DISPN | Distichlis spicata (L.) Greene var. nana Beetle | Distichlis spicata | Poaceae
|