| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| DYSOX | Dysoxylum Blume | | Meliaceae
|
| DYPL | Dysphania plantaginella F.J. Muell. | | Chenopodiaceae
|
| DYSPH | Dysphania R. Br. | dysphania | Chenopodiaceae
|
| DYAC | Dyssodia acerosa DC. | Thymophylla acerosa | Asteraceae
|
| DYAUP | Dyssodia aurea (Gray) A. Nels. var. polychaeta (Gray) M.C. Johnston | Thymophylla aurea var. polychaeta | Asteraceae
|
| DYAU | Dyssodia aurea (Gray) A. Nels. | Thymophylla aurea var. aurea | Asteraceae
|
| DYBE2 | Dyssodia belenidium (DC.) Macloskie | Thymophylla pentachaeta var. belenidium | Asteraceae
|
| DYCO | Dyssodia concinna (Gray) B.L. Robins. | Thymophylla concinna | Asteraceae
|
| DYCO2 | Dyssodia cooperi Gray | Adenophyllum cooperi | Asteraceae
|
| DYHA2 | Dyssodia hartwegii (Gray) B.L. Robins. | Thymophylla pentachaeta var. hartwegii | Asteraceae
|
| DYMI | Dyssodia micropoides (DC.) Loes. | Thymophylla micropoides | Asteraceae
|
| DYNE | Dyssodia neomexicana (Gray) B.L. Robins. | Adenophyllum wrightii | Asteraceae
|
| DYPA | Dyssodia papposa (Vent.) A.S. Hitchc. | fetid marigold | Asteraceae
|
| DYPEH2 | Dyssodia pentachaeta (DC.) B.L. Robins. ssp. hartwegii (Gray) Strother | Thymophylla pentachaeta var. hartwegii | Asteraceae
|
| DYPEB | Dyssodia pentachaeta (DC.) B.L. Robins. var. belenidium (DC.) Strother | Thymophylla pentachaeta var. belenidium | Asteraceae
|
| DYPEH | Dyssodia pentachaeta (DC.) B.L. Robins. var. hartwegii (Gray) Strother | Thymophylla pentachaeta var. hartwegii | Asteraceae
|
| DYPEP | Dyssodia pentachaeta (DC.) B.L. Robins. var. puberula (Rydb.) Strother | Thymophylla pentachaeta var. puberula | Asteraceae
|
| DYPE | Dyssodia pentachaeta (DC.) B.L. Robins. | Thymophylla pentachaeta var. pentachaeta | Asteraceae
|
| DYPO2 | Dyssodia polychaeta (Gray) B.L. Robins. | Thymophylla aurea var. polychaeta | Asteraceae
|
| DYPO3 | Dyssodia porophylla (Cav.) Cav. | Adenophyllum porophyllum | Asteraceae
|
| DYPO | Dyssodia porophylloides Gray | Adenophyllum porophylloides | Asteraceae
|
| DYSEG | Dyssodia setifolia (Lag.) B.L. Robins. var. greggii (Gray) M.C. Johnston | Thymophylla setifolia var. radiata | Asteraceae
|
| DYSER | Dyssodia setifolia (Lag.) B.L. Robins. var. radiata (Gray) Strother | Thymophylla setifolia var. radiata | Asteraceae
|
| DYTA | Dyssodia tagetoides Torr. & Gray | Dysodiopsis tagetoides | Asteraceae
|
| DYTEW | Dyssodia tenuiloba (DC.) B.L. Robins. ssp. wrightii (Gray) Strother | Thymophylla tenuiloba var. wrightii | Asteraceae
|
| DYTET | Dyssodia tenuiloba (DC.) B.L. Robins. var. texana (Cory) Strother | Thymophylla tenuiloba var. texana | Asteraceae
|
| DYTET2 | Dyssodia tenuiloba (DC.) B.L. Robins. var. treculii (Gray) Strother | Thymophylla tenuiloba var. treculii | Asteraceae
|
| DYTE | Dyssodia tenuiloba (DC.) B.L. Robins. | Thymophylla tenuiloba var. tenuiloba | Asteraceae
|
| DYTE2 | Dyssodia tephroleuca Blake | Thymophylla tephroleuca | Asteraceae
|
| DYTE4 | Dyssodia texana Cory | Thymophylla tenuiloba var. texana | Asteraceae
|
| DYTH2 | Dyssodia thurberi (Gray) B.L. Robins. | Thymophylla pentachaeta var. belenidium | Asteraceae
|
| DYTR2 | Dyssodia treculii (Gray) B.L. Robins. | Thymophylla tenuiloba var. treculii | Asteraceae
|
| DYWR | Dyssodia wrightii (Gray) B.L. Robins. | Thymophylla tenuiloba var. wrightii | Asteraceae
|
| DYSSO | Dyssodia Cav. | dyssodia | Asteraceae
|
| EAEL | Eastwoodia elegans Brandeg. | yellow aster | Asteraceae
|
| EASTW | Eastwoodia Brandeg. | eastwoodia | Asteraceae
|
| EACO2 | Eatonella congdonii Gray | Lembertia congdonii | Asteraceae
|
| EANI | Eatonella nivea (D.C. Eat.) Gray | white false tickhead | Asteraceae
|
| EATON | Eatonella Gray | eatonella | Asteraceae
|
| EBEB | Ebenopsis ebano (Berl.) Barneby & Grimes | Texas ebony | Fabaceae
|
| EBENO | Ebenopsis Britt. & Rose | Texas ebony | Fabaceae
|
| EBAU2 | Eburophyton austiniae (Gray) Heller | Cephalanthera austiniae | Orchidaceae
|
| ECEC2 | Ecastaphyllum ecastaphyllum (L.) Britt. | Dalbergia ecastaphyllum | Fabaceae
|
| ECEL | Ecballium elaterium (L.) A. Rich. | squirting cucumber | Cucurbitaceae
|
| ECBAL | Ecballium A. Rich. | squirting cucumber | Cucurbitaceae
|
| ECFL3 | Eccremidium floridanum Crum | Florida eccremidium moss | Ditrichaceae
|
| ECCRE | Eccremidium Wils. | eccremidium moss | Ditrichaceae
|
| ECBR2 | Eccremocactus bradei Britton & Rose | | Cactaceae
|
| ECCRE3 | Eccremocactus Britton & Rose | eccremocactus | Cactaceae
|
| ECCH3 | Echeandia chandleri (Greenm. & C.H. Thompson) M.C. Johnston | Chandler's craglily | Liliaceae
|
| ECFL | Echeandia flavescens (J.A. & J.H. Schultes) Cruden | Torrey's craglily | Liliaceae
|
| ECRE2 | Echeandia reflexa (Cav.) Rose | reflexed craglily | Liliaceae
|
| ECHEA | Echeandia Ortega | echeandia | Liliaceae
|
| ECAR | Echeveria arizonica (Rose) Kearney & Peebles | Dudleya pulverulenta ssp. arizonica | Crassulaceae
|
| ECBA4 | Echeveria bartramii (Rose) Kearney & Peebles | Graptopetalum bartramii | Crassulaceae
|
| ECCO8 | Echeveria collomiae (Rose ex Morton) Kearney & Peebles | Dudleya collomiae | Crassulaceae
|
| ECCY | Echeveria cymosa Lem. | Dudleya cymosa ssp. cymosa | Crassulaceae
|
| ECDI | Echeveria diaboli Berger | Dudleya cymosa ssp. paniculata | Crassulaceae
|
| ECPUA2 | Echeveria pulverulenta Nutt. ssp. arizonica (Rose) Clokey | Dudleya pulverulenta ssp. arizonica | Crassulaceae
|
| ECPU3 | Echeveria pulverulenta Nutt. | Dudleya pulverulenta ssp. pulverulenta | Crassulaceae
|
| ECRU2 | Echeveria rusbyi (Greene) A. Nels. & J.F. Macbr. | Graptopetalum rusbyi | Crassulaceae
|
| ECST | Echeveria strictiflora Gray | desert savior | Crassulaceae
|
| ECHEV | Echeveria DC. | echeveria | Crassulaceae
|
| ECCAF | Echidiocarya californica Gray ssp. fulvescens (I.M. Johnston) Abrams | Plagiobothrys collinus var. fulvescens | Boraginaceae
|
| ECCAG | Echidiocarya californica Gray ssp. gracilis (I.M. Johnston) Abrams | Plagiobothrys collinus var. gracilis | Boraginaceae
|
| ECCAU | Echidiocarya californica Gray var. ursina (Gray) Jepson | Plagiobothrys collinus var. ursinus | Boraginaceae
|
| ECCA | Echidiocarya californica Gray | Plagiobothrys collinus var. californicus | Boraginaceae
|
| ECANA | Echinacea angustifolia DC. var. angustifolia | blacksamson echinacea | Asteraceae
|
| ECANS | Echinacea angustifolia DC. var. strigosa R.L. McGregor | strigose blacksamson | Asteraceae
|
| ECANT | Echinacea angustifolia DC. var. tennesseensis (Beadle) Blake | Echinacea tennesseensis | Asteraceae
|
| ECAN2 | Echinacea angustifolia DC. | blacksamson echinacea | Asteraceae
|
| ECATP | Echinacea atrorubens Nutt. var. paradoxa (J.B.S. Norton) Cronq. | Echinacea paradoxa var. paradoxa | Asteraceae
|
| ECAT | Echinacea atrorubens Nutt. | Topeka purple coneflower | Asteraceae
|
| ECLA | Echinacea laevigata (C.L. Boynt. & Beadle) Blake | smooth purple coneflower | Asteraceae
|
| ECPAA | Echinacea pallida (Nutt.) Nutt. var. angustifolia (DC.) Cronq. | Echinacea angustifolia var. angustifolia | Asteraceae
|
| ECPAS2 | Echinacea pallida (Nutt.) Nutt. var. sanguinea (Nutt.) Gandhi & Thomas | Echinacea sanguinea | Asteraceae
|
| ECPAS | Echinacea pallida (Nutt.) Nutt. var. strigosa (R.L. McGregor) Gandhi | Echinacea angustifolia var. strigosa | Asteraceae
|
| ECPA | Echinacea pallida (Nutt.) Nutt. | pale purple coneflower | Asteraceae
|
| ECPAN | Echinacea paradoxa (J.B.S. Norton) Britt. var. neglecta R.L. McGregor | Bush's purple coneflower | Asteraceae
|
| ECPAP | Echinacea paradoxa (J.B.S. Norton) Britt. var. paradoxa | Bush's purple coneflower | Asteraceae
|
| ECPA2 | Echinacea paradoxa (J.B.S. Norton) Britt. | Bush's purple coneflower | Asteraceae
|
| ECPUA | Echinacea purpurea (L.) Moench var. arkansana Steyermark | Echinacea purpurea | Asteraceae
|
| ECPUL2 | Echinacea purpurea (L.) Moench var. laevigata (C.L. Boynt. & Beadle) Cronq. | Echinacea laevigata | Asteraceae
|
| ECPU | Echinacea purpurea (L.) Moench | eastern purple coneflower | Asteraceae
|
| ECSA | Echinacea sanguinea Nutt. | sanguin purple coneflower | Asteraceae
|
| ECSI | Echinacea simulata R.L. McGregor | wavyleaf purple coneflower | Asteraceae
|
| ECTE3 | Echinacea tennesseensis (Beadle) Small | Tennessee purple coneflower | Asteraceae
|
| ECHIN | Echinacea Moench | purple coneflower | Asteraceae
|
| ECAC3 | Echinocactus acanthodes Lem. | Ferocactus cylindraceus var. cylindraceus | Cactaceae
|
| ECAS | Echinocactus asterias Zucc. | Astrophytum asterias | Cactaceae
|
| ECBIS | Echinocactus bicolor Galeotti ex Pfeiffer var. schottii Engelm. | Thelocactus bicolor var. bicolor | Cactaceae
|
| ECBI | Echinocactus bicolor Galeotti ex Pfeiffer | Thelocactus bicolor var. bicolor | Cactaceae
|
| ECCO7 | Echinocactus conoideus (DC.) Poselg. | Neolloydia conoidea | Cactaceae
|
| ECER4 | Echinocactus erectocentrus Coult. | Sclerocactus erectocentrus | Cactaceae
|
| ECFL2 | Echinocactus flavidispinus (Backeberg) Weniger | Thelocactus bicolor var. flavidispinus | Cactaceae
|
| ECGL | Echinocactus glaucus (J.A. Purpus ex K. Schum.) L. Benson | Sclerocactus glaucus | Cactaceae
|
| ECHA2 | Echinocactus hamatacanthus Muehlenpfordt | Ferocactus hamatacanthus var. hamatacanthus | Cactaceae
|
| ECHOH | Echinocactus horizonthalonius Lem. var. horizonthalonius | devilshead | Cactaceae
|
| ECHOM | Echinocactus horizonthalonius Lem. var. moelleri Haage f. | Echinocactus horizonthalonius var. horizonthalonius | Cactaceae
|
| ECHON | Echinocactus horizonthalonius Lem. var. nicholii L. Benson | Nichol's echinocactus | Cactaceae
|
| ECHO | Echinocactus horizonthalonius Lem. | devilshead | Cactaceae
|