| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ACLI | Acalypha lindheimeri Muell.-Arg. | Acalypha phleoides | Euphorbiaceae
|
| ACME7 | Acalypha mexicana Muell.-Arg. | Mexican copperleaf | Euphorbiaceae
|
| ACMO4 | Acalypha monococca (Engelm. ex Gray) L. Mill. & Gandhi | slender threeseed mercury | Euphorbiaceae
|
| ACMO | Acalypha monostachya Cav. | round copperleaf | Euphorbiaceae
|
| ACNE | Acalypha neomexicana Muell.-Arg. | New Mexico copperleaf | Euphorbiaceae
|
| ACOS | Acalypha ostryifolia Riddell | pineland threeseed mercury | Euphorbiaceae
|
| ACPH3 | Acalypha phleoides Cav. | shrubby copperleaf | Euphorbiaceae
|
| ACPO | Acalypha poiretii Spreng. | Poiret's copperleaf | Euphorbiaceae
|
| ACPO4 | Acalypha portoricensis Muell.-Arg. | Puerto Rico copperleaf | Euphorbiaceae
|
| ACPR | Acalypha pringlei S. Wats. | Acalypha californica | Euphorbiaceae
|
| ACRA | Acalypha radians Torr. | cardinal's feather | Euphorbiaceae
|
| ACRHD | Acalypha rhomboidea Raf. var. deamii (Weatherby) Weatherby | Acalypha deamii | Euphorbiaceae
|
| ACRH | Acalypha rhomboidea Raf. | Virginia threeseed mercury | Euphorbiaceae
|
| ACSE | Acalypha setosa A. Rich. | Cuban copperleaf | Euphorbiaceae
|
| ACVID | Acalypha virginica L. var. deamii Weatherby | Acalypha deamii | Euphorbiaceae
|
| ACVIR | Acalypha virginica L. var. rhomboidea (Raf.) Cooperrider | Acalypha rhomboidea | Euphorbiaceae
|
| ACVI | Acalypha virginica L. | Virginia threeseed mercury | Euphorbiaceae
|
| ACWI | Acalypha wilkesiana Muell.-Arg. | Acalypha amentacea ssp. wilkesiana | Euphorbiaceae
|
| ACALY | Acalypha L. | copperleaf | Euphorbiaceae
|
| ACSE5 | Acamptoclados sessilispicus (Buckl.) Nash | Eragrostis sessilispica | Poaceae
|
| ACSH | Acamptopappus shockleyi Gray | Shockley's goldenhead | Asteraceae
|
| ACSPH | Acamptopappus sphaerocephalus (Harvey & Gray ex Gray) Gray var. hirtellus Blake | rayless goldenhead | Asteraceae
|
| ACSPS2 | Acamptopappus sphaerocephalus (Harvey & Gray ex Gray) Gray var. sphaerocephalus | rayless goldenhead | Asteraceae
|
| ACSP | Acamptopappus sphaerocephalus (Harvey & Gray ex Gray) Gray | rayless goldenhead | Asteraceae
|
| ACAMP | Acamptopappus (Gray) Gray | goldenhead | Asteraceae
|
| ACFL3 | Acanthocereus floridanus Small | Acanthocereus tetragonus | Cactaceae
|
| ACPE5 | Acanthocereus pentagonus (L.) Britt. & Rose | Acanthocereus tetragonus | Cactaceae
|
| ACTE4 | Acanthocereus tetragonus (L.) Humm. | triangle cactus | Cactaceae
|
| ACANT6 | Acanthocereus (Engelm. ex Berger) Britt. & Rose | triangle cactus | Cactaceae
|
| ACWR6 | Acanthochiton wrightii Torr. | Amaranthus acanthochiton | Amaranthaceae
|
| ACCA22 | Acanthocladium carlottae Schof. | Wijkia carlottae | Sematophyllaceae
|
| ACCO6 | Acanthogonum corrugatum Torr. | Chorizanthe corrugata | Polygonaceae
|
| ACPOL | Acanthogonum polygonoides (Torr. & Gray) Goodman var. longispinum Goodman | Chorizanthe polygonoides var. longispina | Polygonaceae
|
| ACPO6 | Acanthogonum polygonoides (Torr. & Gray) Goodman | Chorizanthe polygonoides var. polygonoides | Polygonaceae
|
| ACRI2 | Acanthogonum rigidum Torr. | Chorizanthe rigida | Polygonaceae
|
| ACDU2 | Acanthomintha duttonii (Abrams) Jokerst | San Mateo thorn-mint | Lamiaceae
|
| ACIL | Acanthomintha ilicifolia (Gray) Gray | San Diego thorn-mint | Lamiaceae
|
| ACLA2 | Acanthomintha lanceolata Curran | Santa Clara thorn-mint | Lamiaceae
|
| ACOBC | Acanthomintha obovata Jepson ssp. cordata Jokerst | heartleaf thorn-mint | Lamiaceae
|
| ACOBD | Acanthomintha obovata Jepson ssp. duttonii Abrams | Acanthomintha duttonii | Lamiaceae
|
| ACOBO | Acanthomintha obovata Jepson ssp. obovata | San Benito thorn-mint | Lamiaceae
|
| ACOB | Acanthomintha obovata Jepson | San Benito thorn-mint | Lamiaceae
|
| ACANT2 | Acanthomintha (Gray) Gray | thorn-mint | Lamiaceae
|
| ACSE8 | Acanthopanax senticosus (Rupr. & Maxim.) Harms | Eleutherococcus senticosus | Araliaceae
|
| ACSI2 | Acanthopanax sieboldianus Makino | Eleutherococcus pentaphyllus | Araliaceae
|
| ACAU2 | Acanthospermum australe (Loefl.) Kuntze | Paraguayan starburr | Asteraceae
|
| ACHI | Acanthospermum hispidum DC. | hispid starburr | Asteraceae
|
| ACHU | Acanthospermum humile (Sw.) DC. | low starburr | Asteraceae
|
| ACXA | Acanthospermum xanthioides DC. | southern starburr | Asteraceae
|
| ACANT3 | Acanthospermum Schrank | starburr | Asteraceae
|
| ACSP5 | Acanthoxanthium spinosum (L.) Fourr. | Xanthium spinosum | Asteraceae
|
| ACEB3 | Acanthus ebracteatus Vahl | acanthus | Acanthaceae
|
| ACMO8 | Acanthus mollis L. | bear's breech | Acanthaceae
|
| ACPOP | Acanthus polystachyus Delile var. pseudopubescens Cufod. | | Acanthaceae
|
| ACPO10 | Acanthus polystachyus Delile | | Acanthaceae
|
| ACPU4 | Acanthus pubescens Engl. | Acanthus polystachyus var. pseudopubescens | Acanthaceae
|
| ACSP7 | Acanthus spinosus L. | spine acanthus | Acanthaceae
|
| ACSY | Acanthus syriacus Boiss. | Syrian acanthus | Acanthaceae
|
| ACANT7 | Acanthus L. | acanthus | Acanthaceae
|
| ACAE | Acarospora aeruginosa Hasse | cracked lichen | Acarosporaceae
|
| ACAL14 | Acarospora albida H. Magn. | Acarospora schleicheri | Acarosporaceae
|
| ACAL13 | Acarospora albomarginata (Herre) Salisb. | cracked lichen | Acarosporaceae
|
| ACAM6 | Acarospora amabilis H. Magn. | Acarospora schleicheri | Acarosporaceae
|
| ACAM5 | Acarospora americana H. Magn. | American cracked lichen | Acarosporaceae
|
| ACAM7 | Acarospora amphibola Wedd. | cracked lichen | Acarosporaceae
|
| ACAP | Acarospora applanata H. Magn. | cracked lichen | Acarosporaceae
|
| ACAR8 | Acarospora arenacea H. Magn. | cracked lichen | Acarosporaceae
|
| ACAR9 | Acarospora arenosa Herre | cracked lichen | Acarosporaceae
|
| ACAS3 | Acarospora asahinae H. Magn. | Asahina's cracked lichen | Acarosporaceae
|
| ACAS4 | Acarospora asperata H. Magn. | cracked lichen | Acarosporaceae
|
| ACBA4 | Acarospora badiofusca (Nyl.) Th. Fr. | cracked lichen | Acarosporaceae
|
| ACBE5 | Acarospora bella (Nyl.) Jatta | Acarospora schleicheri | Acarosporaceae
|
| ACBO2 | Acarospora boulderensis H. Magn. | Acarospora badiofusca | Acarosporaceae
|
| ACBU2 | Acarospora bullata Anzi | cracked lichen | Acarosporaceae
|
| ACCA14 | Acarospora caesiofusca (Mull. Arg.) H. Magn. | cracked lichen | Acarosporaceae
|
| ACCA15 | Acarospora californica Zahlbr. | California cracked lichen | Acarosporaceae
|
| ACCA16 | Acarospora canadensis H. Magn. | Canada cracked lichen | Acarosporaceae
|
| ACCA17 | Acarospora carnegiei Zahlbr. | Carnegie's cracked lichen | Acarosporaceae
|
| ACCA19 | Acarospora cartilaginea H. Magn. | Acarospora fuscata | Acarosporaceae
|
| ACCE | Acarospora cervina A. Massal. | cracked lichen | Acarosporaceae
|
| ACCH60 | Acarospora chlorophana (Wahlenb.) A. Massal. | Pleopsidium chlorophanum | Acarosporaceae
|
| ACCH4 | Acarospora chrysops (Tuck.) H. Magn. | Acarospora schleicheri | Acarosporaceae
|
| ACCI2 | Acarospora cinereoalba (Fink) H. Magn. | cracked lichen | Acarosporaceae
|
| ACCI4 | Acarospora citrina (Taylor) Zahlbr. | cracked lichen | Acarosporaceae
|
| ACCL6 | Acarospora clauzadeana (Llimona) Casares & Hafellner | cracked lichen | Acarosporaceae
|
| ACCO10 | Acarospora coloradiana H. Magn. | Colorado cracked lichen | Acarosporaceae
|
| ACCO11 | Acarospora complanata H. Magn. | cracked lichen | Acarosporaceae
|
| ACCO13 | Acarospora contigua H. Magn. | Acarospora schleicheri | Acarosporaceae
|
| ACDE9 | Acarospora desolata H. Magn. | cracked lichen | Acarosporaceae
|
| ACDI4 | Acarospora dispersa H. Magn. | cracked lichen | Acarosporaceae
|
| ACDI5 | Acarospora dissipata H. Magn. | Acarospora schleicheri | Acarosporaceae
|
| ACEL2 | Acarospora elevata H. Magn. | cracked lichen | Acarosporaceae
|
| ACEP | Acarospora epilutescens Zahlbr. | Acarospora schleicheri | Acarosporaceae
|
| ACER3 | Acarospora erythrophora H. Magn. | Pleopsidium chlorophanum | Acarosporaceae
|
| ACEV | Acarospora evoluta H. Magn. | Acarospora schleicheri | Acarosporaceae
|
| ACFL5 | Acarospora flava (Bellardi) Ach. | Pleopsidium flavum | Acarosporaceae
|
| ACFU2 | Acarospora fuscata (Schrader) Arnold | cracked lichen | Acarosporaceae
|
| ACFU3 | Acarospora fuscescens H. Magn. | cracked lichen | Acarosporaceae
|
| ACGA2 | Acarospora gallica H. Magn. | Gallic cracked lichen | Acarosporaceae
|
| ACGE4 | Acarospora geogena H. Magn. | cracked lichen | Acarosporaceae
|
| ACGE6 | Acarospora geophila H. Magn. | Acarospora geogena | Acarosporaceae
|