| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| IBNU | Iberis nudicaulis L. | Teesdalia nudicaulis | Brassicaceae
|
| IBPR2 | Iberis pruitii Tineo | Pruit's candytuft | Brassicaceae
|
| IBSE | Iberis sempervirens L. | evergreen candytuft | Brassicaceae
|
| IBUM | Iberis umbellata L. | globe candytuft | Brassicaceae
|
| IBERI | Iberis L. | candytuft | Brassicaceae
|
| IBLI | Ibervillea lindheimeri (Gray) Greene | Lindheimer's globeberry | Cucurbitaceae
|
| IBTE3 | Ibervillea tenella (Naud.) Small | Ibervillea lindheimeri | Cucurbitaceae
|
| IBTE2 | Ibervillea tenuisecta (Gray) Small | slimlobe globeberry | Cucurbitaceae
|
| IBTR | Ibervillea tripartita (Naud.) Greene | Ibervillea lindheimeri | Cucurbitaceae
|
| IBERV | Ibervillea Greene | globeberry | Cucurbitaceae
|
| IBLU | Ibicella lutea (Lindl.) Van Eselt. | yellow unicorn-plant | Pedaliaceae
|
| IBICE | Ibicella Van Eselt. | yellow unicorn-plant | Pedaliaceae
|
| IBBE | Ibidium beckii (Lindl.) House | Spiranthes lacera var. gracilis | Orchidaceae
|
| IBCE | Ibidium cernuum (L.) House | Spiranthes cernua | Orchidaceae
|
| IBFL | Ibidium floridanum Wherry | Spiranthes brevilabris var. floridana | Orchidaceae
|
| IBGR | Ibidium gracile (Bigelow) House | Spiranthes lacera var. gracilis | Orchidaceae
|
| IBIN | Ibidium �intermedium (Ames) House | Spiranthes intermedia | Orchidaceae
|
| IBLA | Ibidium laciniatum (Small) House | Spiranthes laciniata | Orchidaceae
|
| IBLO | Ibidium longilabre (Lindl.) House | Spiranthes longilabris | Orchidaceae
|
| IBOV | Ibidium ovale (Lindl.) House | Spiranthes ovalis var. ovalis | Orchidaceae
|
| IBPL | Ibidium plantagineum (Raf.) House | Spiranthes lucida | Orchidaceae
|
| IBPR | Ibidium praecox (Walt.) House | Spiranthes praecox | Orchidaceae
|
| IBST | Ibidium strictum (Rydb.) House | Spiranthes romanzoffiana | Orchidaceae
|
| IBTO | Ibidium tortile (Sw.) House | Spiranthes torta | Orchidaceae
|
| IBVE | Ibidium vernale (Engelm. & Gray) House | Spiranthes vernalis | Orchidaceae
|
| ICSE | Icacina senegalensis Adr. Juss. | false yam | Icacinaceae
|
| ICACI | Icacina Adr. Juss. | icacina | Icacinaceae
|
| ICGL | Icacorea glauciflora (Urban) Britt. | Ardisia glauciflora | Myrsinaceae
|
| ICGU | Icacorea guadalupensis (Duchassaing ex Griseb.) Britt. | Ardisia obovata | Myrsinaceae
|
| ICLU | Icacorea luquillensis Britt. | Ardisia luquillensis | Myrsinaceae
|
| ICPA2 | Icacorea paniculata (Nutt.) Sudworth | Ardisia escallonoides | Myrsinaceae
|
| ICAX | Ichnanthus axillaris (Nees) A.S. Hitchc. & Chase | Ichnanthus pallens var. pallens | Poaceae
|
| ICNE | Ichnanthus nemorosus (Sw.) Doell | creeping bedgrass | Poaceae
|
| ICPAM | Ichnanthus pallens (Sw.) Munro ex Benth. var. majus (Nees) Stieber | caruzo | Poaceae
|
| ICPAP | Ichnanthus pallens (Sw.) Munro ex Benth. var. pallens | caruzo | Poaceae
|
| ICPA | Ichnanthus pallens (Sw.) Munro ex Benth. | caruzo | Poaceae
|
| ICTE | Ichnanthus tenuis (J. Presl) A.S. Hitchc. & Chase | forest bedgrass | Poaceae
|
| ICHNA | Ichnanthus Beauv. | bedgrass | Poaceae
|
| ICPI | Ichthyomethia piscipula (L.) A.S. Hitchc. ex Sarg. | Piscidia piscipula | Fabaceae
|
| ICER | Icmadophila ericetorum (L.) Zahlbr. | peppermint drop lichen | Baeomycetaceae
|
| ICMAD | Icmadophila Trevisan | peppermint drop lichen | Baeomycetaceae
|
| IDSC | Idahoa scapigera (Hook.) A. Nels. & J.F. Macbr. | oldstem idahoa | Brassicaceae
|
| IDAHO | Idahoa A. Nels. & J.F. Macbr. | idahoa | Brassicaceae
|
| ILAMM | Ilex ambigua (Michx.) Torr. var. montana (Torr. & Gray ex Gray) Ahles | Ilex montana | Aquifoliaceae
|
| ILAMM3 | Ilex ambigua (Michx.) Torr. var. monticola (Wood) Wunderlin & Poppleton | Ilex montana | Aquifoliaceae
|
| ILAM | Ilex ambigua (Michx.) Torr. | Carolina holly | Aquifoliaceae
|
| ILAMM2 | Ilex amelanchier M.A. Curtis ex Chapman var. monticola Wood | Ilex montana | Aquifoliaceae
|
| ILAM2 | Ilex amelanchier M.A. Curtis ex Chapman | sarvis holly | Aquifoliaceae
|
| ILAN | Ilex anomala Hook. & Arn. | Hawai'i holly | Aquifoliaceae
|
| ILAQ80 | Ilex aquifolium L. | English holly | Aquifoliaceae
|
| ILAR | Ilex arenicola Ashe | Ilex opaca var. arenicola | Aquifoliaceae
|
| ILAT | Ilex �attenuata Ashe | topal holly | Aquifoliaceae
|
| ILBE | Ilex beadlei Ashe | Ilex ambigua | Aquifoliaceae
|
| ILBR | Ilex bronxensis Britt. | Ilex verticillata | Aquifoliaceae
|
| ILBU | Ilex buswellii Small | Ilex ambigua | Aquifoliaceae
|
| ILCA2 | Ilex caroliniana Trel. ex Small | Ilex ambigua | Aquifoliaceae
|
| ILCAC | Ilex cassine L. var. cassine | dahoon | Aquifoliaceae
|
| ILCAL | Ilex cassine L. var. latifolia Ait. | dahoon | Aquifoliaceae
|
| ILCAM | Ilex cassine L. var. myrtifolia (Walt.) Sarg. | Ilex myrtifolia | Aquifoliaceae
|
| ILCA | Ilex cassine L. | dahoon | Aquifoliaceae
|
| ILCO2 | Ilex collina Alexander | longstalk holly | Aquifoliaceae
|
| ILCO3 | Ilex cookii Britt. & Wilson | te | Aquifoliaceae
|
| ILCO | Ilex coriacea (Pursh) Chapman | large gallberry | Aquifoliaceae
|
| ILCO80 | Ilex cornuta Lindl. & Paxton | Chinese holly | Aquifoliaceae
|
| ILCR2 | Ilex crenata Thunb. | Japanese holly | Aquifoliaceae
|
| ILCU | Ilex cumulicola Small | Ilex opaca var. arenicola | Aquifoliaceae
|
| ILCU2 | Ilex curtissii (Fern.) Small | Ilex decidua | Aquifoliaceae
|
| ILCU3 | Ilex cuthbertii Small | Cuthbert's holly | Aquifoliaceae
|
| ILDEC | Ilex decidua Walt. var. curtissii Fern. | Ilex decidua | Aquifoliaceae
|
| ILDEL | Ilex decidua Walt. var. longipes (Chapman ex Trel.) Ahles | Ilex longipes | Aquifoliaceae
|
| ILDE | Ilex decidua Walt. | possumhaw | Aquifoliaceae
|
| ILFA | Ilex fastigiata Bickn. | Ilex verticillata | Aquifoliaceae
|
| ILGL | Ilex glabra (L.) Gray | inkberry | Aquifoliaceae
|
| ILGU | Ilex guianensis (Aubl.) Kuntze | maconcona | Aquifoliaceae
|
| ILHY | Ilex hypaneura Loes. | Luquillo Mountain holly | Aquifoliaceae
|
| ILKR | Ilex krugiana Loes. | tawnyberry holly | Aquifoliaceae
|
| ILLA | Ilex laevigata (Pursh) Gray | smooth winterberry | Aquifoliaceae
|
| ILLOH | Ilex longipes Chapman ex Trel. var. hirsuta Lundell | Ilex longipes | Aquifoliaceae
|
| ILLO | Ilex longipes Chapman ex Trel. | Georgia holly | Aquifoliaceae
|
| ILMA | Ilex macfadyenii (Walp.) Rehd. | Caribbean holly | Aquifoliaceae
|
| ILMOB | Ilex montana Torr. & Gray ex Gray var. beadlei (Ashe) Fern. | Ilex ambigua | Aquifoliaceae
|
| ILMOM | Ilex montana Torr. & Gray ex Gray var. mollis (Gray) Britt. | Ilex ambigua | Aquifoliaceae
|
| ILMO | Ilex montana Torr. & Gray ex Gray | mountain holly | Aquifoliaceae
|
| ILMO3 | Ilex monticola Gray | Ilex montana | Aquifoliaceae
|
| ILMY | Ilex myrtifolia Walt. | myrtle dahoon | Aquifoliaceae
|
| ILNI | Ilex nitida (Vahl) Maxim. | Puerto Rico holly | Aquifoliaceae
|
| ILOPA | Ilex opaca Ait. var. arenicola (Ashe) Ashe | American holly | Aquifoliaceae
|
| ILOPO | Ilex opaca Ait. var. opaca | American holly | Aquifoliaceae
|
| ILOP | Ilex opaca Ait. | American holly | Aquifoliaceae
|
| ILPA3 | Ilex paraguariensis A. St. Hil. | mate | Aquifoliaceae
|
| ILPA2 | Ilex paraguayensis St.-Hil. | Paraguay tea | Aquifoliaceae
|
| ILPY | Ilex pygmaea McFarlin | Ilex opaca var. arenicola | Aquifoliaceae
|
| ILRI3 | Ilex riedlaei Loes. | Ilex urbaniana var. riedlaei | Aquifoliaceae
|
| ILSA2 | Ilex sandwicensis (Endl.) Loes. | holly | Aquifoliaceae
|
| ILSIO | Ilex sideroxyloides (Sw.) Griseb. var. occidentalis Loes. | gongolin | Aquifoliaceae
|
| ILSIS | Ilex sideroxyloides (Sw.) Griseb. var. sideroxyloides | gongolin | Aquifoliaceae
|
| ILSI | Ilex sideroxyloides (Sw.) Griseb. | gongolin | Aquifoliaceae
|
| ILSI2 | Ilex sintenisii (Urban) Britt. | Sintenis' holly | Aquifoliaceae
|
| ILURR | Ilex urbaniana Loes. var. riedlaei (Loes.) Edwin | Urban's holly | Aquifoliaceae
|
| ILURU | Ilex urbaniana Loes. var. urbaniana | Urban's holly | Aquifoliaceae
|
| ILUR | Ilex urbaniana Loes. | Urban's holly | Aquifoliaceae
|