| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ILVEF | Ilex verticillata (L.) Gray var. fastigiata (Bickn.) Fern. | Ilex verticillata | Aquifoliaceae
|
| ILVEP | Ilex verticillata (L.) Gray var. padifolia (Willd.) Torr. & Gray ex S. Wats. | Ilex verticillata | Aquifoliaceae
|
| ILVET | Ilex verticillata (L.) Gray var. tenuifolia (Torr.) S. Wats. | Ilex verticillata | Aquifoliaceae
|
| ILVE | Ilex verticillata (L.) Gray | common winterberry | Aquifoliaceae
|
| ILVO2 | Ilex volkensiana (Loes.) Kanehira & Hatusima | holly | Aquifoliaceae
|
| ILVO | Ilex vomitoria Ait. | yaupon | Aquifoliaceae
|
| ILEX | Ilex L. | holly | Aquifoliaceae
|
| ILAC | Iliamna acerifolia (Nutt. ex Torr. & Gray) Greene | Iliamna rivularis var. rivularis | Malvaceae
|
| ILAN2 | Iliamna angulata Greene | Iliamna grandiflora | Malvaceae
|
| ILBA | Iliamna bakeri (Jepson) Wiggins | Baker's wild hollyhock | Malvaceae
|
| ILCO4 | Iliamna corei Sherff | Iliamna rivularis var. rivularis | Malvaceae
|
| ILCR | Iliamna crandallii (Rydb.) Wiggins | Crandall's wild hollyhock | Malvaceae
|
| ILGR | Iliamna grandiflora (Rydb.) Wiggins | largeflower wild hollyhock | Malvaceae
|
| ILLA2 | Iliamna latibracteata Wiggins | California wild hollyhock | Malvaceae
|
| ILLO2 | Iliamna longisepala (Torr.) Wiggins | longsepal wild hollyhock | Malvaceae
|
| ILRE | Iliamna remota Greene | Iliamna rivularis var. rivularis | Malvaceae
|
| ILRID | Iliamna rivularis (Dougl. ex Hook.) Greene var. diversa (A. Nels.) Wiggins | streambank wild hollyhock | Malvaceae
|
| ILRIR | Iliamna rivularis (Dougl. ex Hook.) Greene var. rivularis | streambank wild hollyhock | Malvaceae
|
| ILRI | Iliamna rivularis (Dougl. ex Hook.) Greene | streambank wild hollyhock | Malvaceae
|
| ILIAM | Iliamna Greene | wild hollyhock | Malvaceae
|
| ILDE2 | Illecebrum densum Humb. & Bonpl. ex Willd. | Guilleminea densa var. densa | Amaranthaceae
|
| ILVE3 | Illecebrum verticillatum L. | coral necklace | Caryophyllaceae
|
| ILLEC | Illecebrum L. | coral necklace | Caryophyllaceae
|
| ILFL | Illicium floridanum Ellis | Florida anisetree | Illiciaceae
|
| ILPA | Illicium parviflorum Michx. ex Vent. | yellow anisetree | Illiciaceae
|
| ILVE2 | Illicium verum Hook. f. | staranise tree | Illiciaceae
|
| ILLIC | Illicium L. | anisetree | Illiciaceae
|
| ILCA3 | Illosporium carneum Fr. | | Uncertain Lichen Family
|
| ILCO5 | Illosporium corallinum Roberge | Marchandiomyces corallinus | Uncertain Lichen Family
|
| ILLOS | Illosporium Martius | illosporium | Uncertain Lichen Family
|
| ILAT3 | Ilysanthes attenuata (Spreng.) Small | Lindernia dubia var. dubia | Scrophulariaceae
|
| ILDU | Ilysanthes dubia (L.) Barnh. | Lindernia dubia var. dubia | Scrophulariaceae
|
| ILGR2 | Ilysanthes grandiflora (Nutt.) Benth. | Lindernia grandiflora | Scrophulariaceae
|
| ILIN | Ilysanthes inequalis (Walt.) Pennell | Lindernia dubia var. anagallidea | Scrophulariaceae
|
| ILMO2 | Ilysanthes monticola (Nutt.) Raf. | Lindernia monticola | Scrophulariaceae
|
| ILSA | Ilysanthes saxicola (M.A. Curtis) Chapman | Lindernia monticola | Scrophulariaceae
|
| IMCA2 | Immersaria carbonoidea (J. W. Thomson) Esnault & Roux | | Porpidiaceae
|
| IMMER | Immersaria Rambold & Pietschmann | immersaria | Porpidiaceae
|
| IMAU | Impatiens aurella Rydb. | paleyellow touch-me-not | Balsaminaceae
|
| IMBA2 | Impatiens balfourii Hook. f. | Balfour's touch-me-not | Balsaminaceae
|
| IMBA | Impatiens balsamina L. | spotted snapweed | Balsaminaceae
|
| IMBI2 | Impatiens biflora Walt. | Impatiens capensis | Balsaminaceae
|
| IMCA | Impatiens capensis Meerb. | jewelweed | Balsaminaceae
|
| IMEC | Impatiens ecalcarata Blank. | spurless touch-me-not | Balsaminaceae
|
| IMFU | Impatiens fulva Nutt. | Impatiens capensis | Balsaminaceae
|
| IMGL | Impatiens glandulifera Royle | ornamental jewelweed | Balsaminaceae
|
| IMNOB | Impatiens noli-tangere L. ssp. biflora (Walt.) Hult�n | Impatiens capensis | Balsaminaceae
|
| IMNO | Impatiens noli-tangere L. | western touch-me-not | Balsaminaceae
|
| IMNO2 | Impatiens nortonii Rydb. | Impatiens capensis | Balsaminaceae
|
| IMOC | Impatiens occidentalis Rydb. | Impatiens noli-tangere | Balsaminaceae
|
| IMOL | Impatiens oliveri C. Wright ex W. Wats. | Oliver's touch-me-not | Balsaminaceae
|
| IMPA | Impatiens pallida Nutt. | pale touch-me-not | Balsaminaceae
|
| IMPE | Impatiens petersiana Gilg. ex Grignan | Impatiens walleriana | Balsaminaceae
|
| IMRO | Impatiens roylei Walp. | Impatiens glandulifera | Balsaminaceae
|
| IMWA | Impatiens walleriana Hook. f. | buzzy lizzy | Balsaminaceae
|
| IMPAT | Impatiens L. | touch-me-not | Balsaminaceae
|
| IMAR | Imperata arundinacea Cirillo | Imperata cylindrica | Poaceae
|
| IMBR | Imperata brasiliensis Trin. | Brazilian satintail | Poaceae
|
| IMBR2 | Imperata brevifolia Vasey | California satintail | Poaceae
|
| IMCO | Imperata contracta (Kunth) A.S. Hitchc. | guayanilla | Poaceae
|
| IMCY | Imperata cylindrica (L.) Beauv. | cogongrass | Poaceae
|
| IMHO | Imperata hookeri (Rupr. ex Anderss.) Rupr. ex Hack. | Imperata brevifolia | Poaceae
|
| IMPER | Imperata Cirillo | satintail | Poaceae
|
| IMOS | Imperatoria ostruthia L. | Peucedanum ostruthium | Apiaceae
|
| IMAL60 | Imshaugia aleurites (Ach.) S. F. Meyer | Imshaug's lichen | Parmeliaceae
|
| IMPL | Imshaugia placorodia (Ach.) S. F. Meyer | Imshaug's lichen | Parmeliaceae
|
| IMSHA2 | Imshaugia S. F. Meyer | Imshaug's lichen | Parmeliaceae
|
| INDE2 | Incarvillea delavayi Bureau & Franch. | | Bignoniaceae
|
| INCAR | Incarvillea Juss. | incarvillea | Bignoniaceae
|
| INAR2 | Indigofera arrecta Hochst. ex A. Rich. | Natal indigo | Fabaceae
|
| INCA | Indigofera caroliniana P. Mill. | Carolina indigo | Fabaceae
|
| INCO82 | Indigofera colutea (Burm. f.) Merr. | rusty indigo | Fabaceae
|
| INEN2 | Indigofera endecaphylla Jacq. | Indigofera spicata | Fabaceae
|
| INGU | Indigofera guatemalensis Moc. & Sess� ex Prain & Baker | Guatemalan indigo | Fabaceae
|
| INHI | Indigofera hirsuta L. | roughhairy indigo | Fabaceae
|
| INKE | Indigofera keyensis Small | Indigofera trita var. keyensis | Fabaceae
|
| INKI | Indigofera kirilowii Maxim. ex Palibin | Kirilow's indigo | Fabaceae
|
| INLE | Indigofera leptosepala Nutt. ex Torr. & Gray | Indigofera miniata var. leptosepala | Fabaceae
|
| INLI | Indigofera lindheimeriana Scheele | Lindheimer's indigo | Fabaceae
|
| INMIF | Indigofera miniata Ortega var. florida Isely | Florida indigo | Fabaceae
|
| INMIL | Indigofera miniata Ortega var. leptosepala (Nutt. ex Torr. & Gray) B.L. Turner | western indigo | Fabaceae
|
| INMIM | Indigofera miniata Ortega var. miniata | coastal indigo | Fabaceae
|
| INMIT | Indigofera miniata Ortega var. texana (Buckl.) B.L. Turner | Texas indigo | Fabaceae
|
| INMI | Indigofera miniata Ortega | coastal indigo | Fabaceae
|
| INMUK | Indigofera mucronata Spreng. ex DC. var. keyensis (Small) Isely | Indigofera trita var. keyensis | Fabaceae
|
| INMU80 | Indigofera mucronata auct. non Spreng. ex DC. | Indigofera trita var. keyensis | Fabaceae
|
| INPA | Indigofera ?parviflora K. Heyne ex Wight & Arn. | smallflower indigo | Fabaceae
|
| INPI | Indigofera pilosa Poir. | softhairy indigo | Fabaceae
|
| INSP | Indigofera sphaerocarpa Gray | Sonoran indigo | Fabaceae
|
| INSP2 | Indigofera spicata Forsk. | trailing indigo | Fabaceae
|
| INSU3 | Indigofera subulata Vahl ex Poiret | Indigofera trita ssp. subulata | Fabaceae
|
| INSU | Indigofera suffruticosa P. Mill. | anil de pasto | Fabaceae
|
| INSU2 | Indigofera sumatrana Gaertn. | Indigofera tinctoria | Fabaceae
|
| INTE2 | Indigofera teysmannii Miq. | Indigofera zollingeriana | Fabaceae
|
| INTI | Indigofera tinctoria L. | true indigo | Fabaceae
|
| INTR2 | Indigofera trifoliata L. | threeleaf indigo | Fabaceae
|
| INTRS | Indigofera trita L. f. ssp. subulata (Vahl ex Poiret) Ali | Asian indigo | Fabaceae
|
| INTRK | Indigofera trita L. f. var. keyensis (Small) Kartesz & Gandhi | Asian indigo | Fabaceae
|
| INTR | Indigofera trita L. f. | Asian indigo | Fabaceae
|
| INZO | Indigofera zollingeriana Miq. | Zollinger's indigo | Fabaceae
|
| INDIG | Indigofera L. | indigo | Fabaceae
|