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- Iberis candicans Raf., See Dimorphocarpa candicans (Raf.) Rollins
- Ibervillea lindheimeri (Gray) Greene
- Ibervillea tenella (Naud.) Small, See Ibervillea lindheimeri (Gray) Greene
- Ibervillea tripartita (Naud.) Greene, See Ibervillea lindheimeri (Gray) Greene
- Ibervillea Greene
- Ibidium beckii (Lindl.) House., See Spiranthes lacera (Raf.) Raf. var. gracilis (Bigelow) Luer
- Ibidium cernuum (L.) House., See Spiranthes cernua (L.) L.C. Rich.
- Ibidium gracile (Bigel.) House., See Spiranthes lacera (Raf.) Raf. var. gracilis (Bigelow) Luer
- Ibidium plantagineum (Raf.) House, See Spiranthes lucida (H.H. Eat.) Ames
- Ibidium strictum (Rydb.) House, See Spiranthes romanzoffiana Cham.
- Ibidium vernale (Engelm. & Gray) House., See Spiranthes vernalis Engelm. & Gray
- Ibidium Salisb., See Spiranthes Rich.
- Ilex crenata Thunb.
- Ilex curtissii (Fern.) Small, See Ilex crenata Thunb.
- Ilex decidua Walt., See Ilex crenata Thunb.
- Ilex decidua Walt. var. curtissii Fern., See Ilex crenata Thunb.
- Ilex prinoides Aiton, See Ilex crenata Thunb.
- Ilyanthes Raf., See Lindernia All.
- Ilysanthes attenuata (Spreng.) Small, See Lindernia dubia (L.) Pennell var. dubia
- Ilysanthes dubia (L.) Barnhart, See Lindernia dubia (L.) Pennell var. dubia
- Ilysanthes gratioloides (L.) Benth., See Lindernia dubia (L.) Pennell
- Ilysanthes inequalis (Walt.) Pennell, See Lindernia dubia (L.) Pennell var. anagallidea (Michx.) Cooperrider
- Impatiens aurea Muhl. , See Impatiens pallida Nutt.
- Impatiens biflora Walt., See Impatiens capensis Meerb.
- Impatiens capensis Meerb.
- Impatiens fulva Nutt., See Impatiens capensis Meerb.
- Impatiens noli-tangere L. ssp. biflora (Walt.) Hultén, See Impatiens capensis Meerb.
- Impatiens nortonii Rydb., See Impatiens capensis Meerb.
- Impatiens pallida Nutt.
- Impatiens (Rivinius) L., See Impatiens L.
- Impatiens L.
- Indigofera leptosepala Nutt. ex Torr. & Gray, See Indigofera miniata Ort. var. leptosepala (Nutt.) B.L.Turner
- Indigofera miniata Ort. var. leptosepala (Nutt.) B.L.Turner
- Indigofera L.
- Inula alba Nutt., See Oligoneuron album (Nutt.) Nesom
- Inula ericoides Torr., See Chaetopappa ericoides (Torr.) Nesom
- Iodanthus hesperidioides (Torr. & Gray) Gray, See Iodanthus pinnatifidus (Michx.) Steud.
- Iodanthus pinnatifidus (Michx.) Steud.
- Iodanthus Torr. & Gray
- Ionaoxalis violacea (L.) Small., See Oxalis violacea L.
- Ionidium concolor Forst., See Hybanthus concolor (T.F. Forst.) Spreng.
- Ionidium Vent., See Hybanthus Jacq.
- Ionoxalis Small., See Oxalis L.
- Ioxylon pomiferum Raf., See Maclura pomifera (Raf.) Schneid.
- Ipomoea barbigeraSweet, See Ipomoea hederacea Jacq.
- Ipomoea carletoni Hols., See Ipomoea shumardiana (Torr.) Shinners
- Ipomoea coccinea L.
- Ipomoea cristulata Hallier f.
- Ipomoea desertorum House, See Ipomoea hederacea Jacq.
- Ipomoea hederacea (L.) Jacq., See Ipomoea hederacea Jacq.
- Ipomoea hederacea Jacq.
- Ipomoea hederacea Jacq. var. integriuscula Gray, See Ipomoea hederacea Jacq.
- Ipomoea hederifolia auct. non L., See Ipomoea coccinea L.
- Ipomoea hirsutula auct. non Jacq. f., See Ipomoea hederacea Jacq.
- Ipomoea hirsutula Jacq. f., See Ipomoea purpurea (L.) Roth
- Ipomoea lacunosa L.
- Ipomoea leptophylla Torr.
- Ipomoea pandurata (L.) G.F.W. Mey.
- Ipomoea pandurata (L.) G.F.W. Mey. var. rubescens Choisy, See Ipomoea pandurata (L.) G.F.W. Mey.
- Ipomoea purpurea (L.) Lam., See Ipomoea purpurea (L.) Roth
- Ipomoea purpurea (L.) Roth
- Ipomoea purpurea (L.) Roth var. diversifolia (Lindl.) O'Donell, See Ipomoea purpurea (L.) Roth
- Ipomoea purpurea Lam., See Ipomoea purpurea (L.) Roth
- Ipomoea quamoclit L.
- Ipomoea shumardiana (Torr.) Shinners
- Ipomoea L.
- Ipomopsis congesta (Hook.) V. Grant
- Ipomopsis congesta (Hook.) V. Grant ssp. congesta
- Ipomopsis coronifolia, See Ipomopsis rubra (L.) Wherry
- Ipomopsis laxiflora (Coult.) V. Grant
- Ipomopsis longiflora (Torr.) V. Grant ssp. longiflora
- Ipomopsis pumila (Nutt.) V. Grant
- Ipomopsis rubra (L.) Wherry
- Ipomopsis spicata (Nutt.) V. Grant
- Ipomopsis spicata (Nutt.) V. Grant ssp. spicata
- Ipomopsis Michx.
- Iresine celosia L. - Rydberg, See Iresine rhizomatosa Standl.
- Iresine celosioides auct. non L., See Iresine rhizomatosa Standl.
- Iresine rhizomatosa Standl.
- Iresine P. Br.
- Iris brevicaulis Raf.
- Iris brevipes Small, See Iris brevicaulis Raf.
- Iris foliosa Mackenzie & Bush, See Iris brevicaulis Raf.
- Iris hexagona Walt., See Iris virginica L.
- Iris longipetala Herbert, See Iris missouriensis Nutt.
- Iris mississippiensis Alexander, See Iris brevicaulis Raf.
- Iris missouriensis Nutt.
- Iris missouriensis Nutt. var. arizonica (Dykes) R.C. Foster, See Iris missouriensis Nutt.
- Iris missouriensis Nutt. var. pelogonus (Goodding) R.C. Foster, See Iris missouriensis Nutt.
- Iris pariensisWelsh, See Iris missouriensis Nutt.
- Iris pseudacorus L.
- Iris shrevei Small, See Iris virginica L. var. shrevei (Small) E. Anders.
- Iris tolmieana Herbert, See Iris missouriensis Nutt.
- Iris versicolor L.
- Iris versicolor L. var. blandescens Nieuwl., See Iris virginica L. var. shrevei (Small) E. Anders.
- Iris versicolor L. var. shrevei (Small) Boivin, See Iris virginica L. var. shrevei (Small) E. Anders.
- Iris virginica L.
- Iris virginica L. var. shrevei (Small) E. Anders.
- Iris (Tourn.) L., See Iris L.
- Iris L.
- Isanthus brachiatus (L.) B.S.P.
- Isanthus brachiatus (L.) B.S.P. var. linearis Fassett, See Isanthus brachiatus (L.) B.S.P.
- Isanthus Michx.
- Isnardia intermedia Small & Alexander, See Ludwigia repens Forst.
- Isnardia palustris L., See Ludwigia palustris (L.) Ell.
- Isnardia palustris L., non Jussiaea palustris G.F.W. Mey., See Ludwigia palustris (L.) Ell.
- Isnardia repens (J.R. Forst.) DC., See Ludwigia repens Forst.
- Isnardia L., See Ludwigia L.
- Isocoma pluriflora (Torr. & Gray) Greene
- Isocoma wrightii (Gray) Rydb., See Isocoma pluriflora (Torr. & Gray) Greene
- Isoetes butleri Engelman
- Isoetes melanopoda Gay & Durieu ex Durieu
- Isoetes L.
- Isolepis carinata Hook. & Arn. ex Torr.
- Isopappus validus Rydb., See Croptilon hookerianum (Torr. & Gray) House var. validum (Rydb.) E.B. Sm.
- Isopyrum biternatum (Raf.) Torr. & Gray, See Enemion biternatum Raf.
- Isopyrum L., See Enemion Raf.
- Iva angustifolia Nutt.
- Iva annua L.
- Iva annua L. var. annua
- Iva axillaris Pursh
- Iva axillaris Pursh ssp. robustior (Hook.) Bassett, See Iva axillaris Pursh
- Iva axillaris Pursh var. robustior Hook., See Iva axillaris Pursh
- Iva ciliata Willd., See Iva annua L. var. annua
- Iva xanthifolia Nutt.
- Iva xanthiifolia (Tresen.) Nutt., See Iva xanthifolia Nutt.
- Iva xanthiifolia Nutt., See Iva xanthifolia Nutt.
- Iva L.
- Ixia acuta Bartr., non Roemer & J.A. Schultes, See Nemastylis geminiflora Nutt.
- Ixia chinensis L., See Pennisetum glaucum (L.) R. Br.
- Ixophorus glaucus L., See Pennisetum glaucum (L.) R. Br.
- Ixophorus italicus (L.) Nash, See Setaria italica (L.) Beauv.
- Ixophorus viridis L., See Setaria viridis (L.) Beauv.
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