| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| DISPS2 | Distichlis spicata (L.) Greene var. stricta (Torr.) Scribn. | Distichlis spicata | Poaceae
|
| DISP | Distichlis spicata (L.) Greene | inland saltgrass | Poaceae
|
| DISTD | Distichlis stricta (Torr.) Rydb. var. dentata (Rydb.) C.L. Hitchc. | Distichlis spicata | Poaceae
|
| DIST3 | Distichlis stricta (Torr.) Rydb. | Distichlis spicata | Poaceae
|
| DITE8 | Distichlis texana (Vasey) Scribn. | Allolepis texana | Poaceae
|
| DISTI | Distichlis Raf. | saltgrass | Poaceae
|
| DIBU3 | Distictis buccinatoria (DC.) A. H. Gentry | blood-trumpet | Bignoniaceae
|
| DILA10 | Distictis lactiflora (Vahl) DC. | liana fragante | Bignoniaceae
|
| DISTI2 | Distictis Mart. ex Meisn. | distictis | Bignoniaceae
|
| DIAM6 | Distopyrenis americana Aptroot | | Pyrenulaceae
|
| DIPA28 | Distopyrenis pachyospora Aptroot | | Pyrenulaceae
|
| DIQU3 | Distopyrenis quercicola R. C. Harris | | Pyrenulaceae
|
| DISU9 | Distopyrenis submuriformis R. C. Harris | | Pyrenulaceae
|
| DISTO | Distopyrenis Aptroot | distopyrenis | Pyrenulaceae
|
| DIAD4 | Ditaxis adenophora auct. non (Gray) Pax & K. Hoffman | Argythamnia claryana | Euphorbiaceae
|
| DIAP2 | Ditaxis aphoroides (Muell.-Arg.) Pax | Argythamnia aphoroides | Euphorbiaceae
|
| DIBL2 | Ditaxis blodgettii (Torr.) Pax | Argythamnia blodgettii | Euphorbiaceae
|
| DIBRI | Ditaxis brandegeei (Millsp.) Rose & Standl. var. intonsa I.M. Johnston | Argythamnia brandegeei var. intonsa | Euphorbiaceae
|
| DICA13 | Ditaxis californica (Brandeg.) Heller | Argythamnia californica | Euphorbiaceae
|
| DICL4 | Ditaxis claryana (Jepson) G.L. Webster | Argythamnia claryana | Euphorbiaceae
|
| DICY4 | Ditaxis cyanophylla Woot. & Standl. | Argythamnia cyanophylla | Euphorbiaceae
|
| DIDI10 | Ditaxis diversiflora Clokey | Argythamnia cyanophylla | Euphorbiaceae
|
| DIFA5 | Ditaxis fasciculata Vahl ex A. Juss. | Argythamnia fasciculata | Euphorbiaceae
|
| DIHU | Ditaxis humilis (Engelm. & Gray) Pax | Argythamnia humilis var. humilis | Euphorbiaceae
|
| DILA14 | Ditaxis laevis (Torr.) Heller | Argythamnia humilis var. laevis | Euphorbiaceae
|
| DILA15 | Ditaxis lanceolata (Benth.) Pax & K. Hoffmann | Argythamnia lanceolata | Euphorbiaceae
|
| DIME3 | Ditaxis mercurialina (Nutt.) Coult. | Argythamnia mercurialina var. mercurialina | Euphorbiaceae
|
| DINE2 | Ditaxis neomexicana (Muell.-Arg.) Heller | Argythamnia neomexicana | Euphorbiaceae
|
| DISEC | Ditaxis serrata (Torr.) Heller var. californica (Brandeg.) V.W. Steinmann & R.S. Felger | Argythamnia californica | Euphorbiaceae
|
| DISE11 | Ditaxis serrata (Torr.) Heller | Argythamnia serrata | Euphorbiaceae
|
| DICAM | Dithyrea californica Harvey var. maritima (A. Davids.) A. Davids. | Dithyrea maritima | Brassicaceae
|
| DICA7 | Dithyrea californica Harvey | California shieldpod | Brassicaceae
|
| DIGR9 | Dithyrea griffithsii Woot. & Standl. | Dimorphocarpa wislizeni | Brassicaceae
|
| DIMA6 | Dithyrea maritima (A. Davids.) A. Davids. | beach shieldpod | Brassicaceae
|
| DIWIG | Dithyrea wislizeni Engelm. var. griffithsii (Woot. & Standl.) Payson | Dimorphocarpa wislizeni | Brassicaceae
|
| DIWIP | Dithyrea wislizeni Engelm. var. palmeri Payson | Dimorphocarpa candicans | Brassicaceae
|
| DIWI6 | Dithyrea wislizeni Engelm. | Dimorphocarpa wislizeni | Brassicaceae
|
| DITHY | Dithyrea Harvey | shieldpod | Brassicaceae
|
| DIHI5 | Ditremexa hirsuta (L.) Britt. & Rose ex Britt. & Wilson | Senna hirsuta var. hirsuta | Fabaceae
|
| DILI7 | Ditremexa ligustrina (L.) Britt. & Rose | Senna ligustrina | Fabaceae
|
| DIMA14 | Ditremexa marilandica (L.) Britt. & Rose | Senna marilandica | Fabaceae
|
| DIME4 | Ditremexa medsgeri (Shafer) Britt. & Rose | Senna marilandica | Fabaceae
|
| DIOC5 | Ditremexa occidentalis (L.) Britt. & Rose ex Britt. & Wilson | Senna occidentalis | Fabaceae
|
| DIAL10 | Ditremis albiseda (Nyl.) R. C. Harris | Anisomeridium albisedum | Monoblastiaceae
|
| DIAM7 | Ditremis ambigua (Zahlbr.) R. C. Harris | Anisomeridium ambiguum | Monoblastiaceae
|
| DIAN6 | Ditremis anisoloba (Mull. Arg.) R. C. Harris | Anisomeridium anisolobum | Monoblastiaceae
|
| DIBI6 | Ditremis biformis (Borrer) R. C. Harris | Anisomeridium biforme | Monoblastiaceae
|
| DICA32 | Ditremis carinthiaca (Steiner) R. C. Harris | Anisomeridium carthiniacum | Monoblastiaceae
|
| DIDI17 | Ditremis distans (Willey) R. C. Harris | Anisomeridium distans | Monoblastiaceae
|
| DIFI2 | Ditremis finkii R. C. Harris | Anisomeridium finkii | Monoblastiaceae
|
| DILE10 | Ditremis leucochlora (Mull. Arg.) R. C. Harris | Anisomeridium leucochlorum | Monoblastiaceae
|
| DIMA20 | Ditremis macrospora R. C. Harris | Anisomeridium aureopunctatum | Monoblastiaceae
|
| DINY | Ditremis nyssigena (Ellis & Everh.) R. C. Harris | Anisomeridium nyssigenum | Monoblastiaceae
|
| DIQU2 | Ditremis quaternaria R. C. Harris | Anisomeridium quaternarium | Monoblastiaceae
|
| DISA13 | Ditremis sanfordensis (Zahlbr.) R. C. Harris | Anisomeridium excaecariae | Monoblastiaceae
|
| DISU8 | Ditremis subprostans (Nyl.) R. C. Harris | Anisomeridium subprostans | Monoblastiaceae
|
| DITA2 | Ditremis tamarindii (Fee) R. C. Harris | Anisomeridium tamarindi | Monoblastiaceae
|
| DITE9 | Ditremis terminata (Nyl.) R. C. Harris | Anisomeridium terminatum | Monoblastiaceae
|
| DITU | Ditremis tuckerae (R. C. Harris) R. C. Harris | Anisomeridium tuckerae | Monoblastiaceae
|
| DIAM5 | Ditrichum ambiguum Best | ambiguous ditrichum moss | Ditrichaceae
|
| DIBO3 | Ditrichum boreale (Williams) Grout | Trichodon cylindricus var. oblongus | Ditrichaceae
|
| DICR5 | Ditrichum crispatissimum (C. M�ll.) Par. | Ditrichum flexicaule | Ditrichaceae
|
| DICU5 | Ditrichum currituckii Grout | Ditrichum pallidum | Ditrichaceae
|
| DIFL70 | Ditrichum flexicaule (Schwaegr.) Hampe | ditrichum moss | Ditrichaceae
|
| DIHE5 | Ditrichum henryi Crum & Anderson | Ditrichum rhynchostegium | Ditrichaceae
|
| DIHE3 | Ditrichum heteromallum (Hedw.) Britt. | ditrichum moss | Ditrichaceae
|
| DIHO6 | Ditrichum homomallum (Hedw.) Hampe | Ditrichum heteromallum | Ditrichaceae
|
| DILI10 | Ditrichum lineare (Sw.) Lindb. | ditrichum moss | Ditrichaceae
|
| DIMO8 | Ditrichum montanum Leib. | montane ditrichum moss | Ditrichaceae
|
| DIPA22 | Ditrichum pallidum (Hedw.) Hampe | pale ditrichum moss | Ditrichaceae
|
| DIPU7 | Ditrichum pusillum (Hedw.) Hampe | ditrichum moss | Ditrichaceae
|
| DIRH2 | Ditrichum rhynchostegium Kindb. | ditrichum moss | Ditrichaceae
|
| DISC6 | Ditrichum schimperi (Lesq.) Kuntze | Schimper's ditrichum moss | Ditrichaceae
|
| DITO5 | Ditrichum tortuloides Grout | Ditrichum ambiguum | Ditrichaceae
|
| DIVA8 | Ditrichum vaginans (Sull.) Hampe | Ditrichum lineare | Ditrichaceae
|
| DIZOS | Ditrichum zonatum (Brid.) Kindb. var. scabrifolium Dix. | ditrichum moss | Ditrichaceae
|
| DIZOZ | Ditrichum zonatum (Brid.) Kindb. var. zonatum | ditrichum moss | Ditrichaceae
|
| DIZO | Ditrichum zonatum (Brid.) Kindb. | ditrichum moss | Ditrichaceae
|
| DITRI2 | Ditrichum Hampe | ditrichum moss | Ditrichaceae
|
| DIMY | Ditta myricoides Griseb. | jaboncillo | Euphorbiaceae
|
| DITTA | Ditta Griseb. | ditta | Euphorbiaceae
|
| DIGR3 | Dittrichia graveolens (L.) W. Greuter | stinkwort | Asteraceae
|
| DIVI6 | Dittrichia viscosa (L.) W. Greuter | false yellowhead | Asteraceae
|
| DITTR | Dittrichia W. Greuter | dittrichia | Asteraceae
|
| DOLE | Dodecahema leptoceras (Gray ex Benth.) Reveal & Hardham | slenderhorn spineflower | Polygonaceae
|
| DODEC2 | Dodecahema Reveal & Hardham | spineflower | Polygonaceae
|
| DOALA | Dodecatheon alpinum (Gray) Greene ssp. alpinum | alpine shootingstar | Primulaceae
|
| DOALM | Dodecatheon alpinum (Gray) Greene ssp. majus H.J. Thompson | alpine shootingstar | Primulaceae
|
| DOAL | Dodecatheon alpinum (Gray) Greene | alpine shootingstar | Primulaceae
|
| DOAM | Dodecatheon amethystinum (Fassett) Fassett | jeweled shootingstar | Primulaceae
|
| DOAU | Dodecatheon austrofrigidum sp. nov. ined. | tundra shootingstar | Primulaceae
|
| DOBR | Dodecatheon brachycarpum Small | Dodecatheon meadia ssp. brachycarpum | Primulaceae
|
| DOCLC | Dodecatheon clevelandii Greene ssp. clevelandii | padre's shootingstar | Primulaceae
|
| DOCLI | Dodecatheon clevelandii Greene ssp. insulare H.J. Thompson | padre's shootingstar | Primulaceae
|
| DOCLP | Dodecatheon clevelandii Greene ssp. patulum (Greene) H.J. Thompson | padre's shootingstar | Primulaceae
|
| DOCLS | Dodecatheon clevelandii Greene ssp. sanctarum (Greene) Abrams | padre's shootingstar | Primulaceae
|
| DOCL | Dodecatheon clevelandii Greene | padre's shootingstar | Primulaceae
|
| DOCOC3 | Dodecatheon conjugens Greene ssp. conjugens | Bonneville shootingstar | Primulaceae
|
| DOCOL | Dodecatheon conjugens Greene ssp. leptophyllum (Suksdorf) Piper | Dodecatheon conjugens ssp. conjugens | Primulaceae
|
| DOCOV2 | Dodecatheon conjugens Greene ssp. viscidum (Piper) H.J. Thompson | Bonneville shootingstar | Primulaceae
|
| DOCOB2 | Dodecatheon conjugens Greene var. beamishii Boivin | Dodecatheon conjugens ssp. conjugens | Primulaceae
|