I - K
| Iberis amara | Schleifenblume Bittere | Annual Candytuft | Brassicaceae |
| Iberis aurosica | Schleifenblume Mont Arouze | Mount Arouze Candytuft | Brassicaceae |
| Iberis bernardiana | Schleifenblume Bernards | Bernard's Candytuft | Brassicaceae |
| Iberis carnosa | Schleifenblume Fleischige | Pruit's Candytuft | Brassicaceae |
| Iberis ciliata | Schleifenblume Bewimperte | Ciliate Candytuft | Brassicaceae |
| Iberis contracta | Schleifenblume Zusammengezogene | Contracted Candytuft | Brassicaceae |
| Iberis font- queri | Schleifenblume Font- Quers | Font- Quer's Candytuft | Brassicaceae |
| Iberis gibraltarica | Schleifenblume Gibraltar | Gibraltar Candytuft | Brassicaceae |
| Iberis grosii | Schleifenblume Grosis | Grosi's Candytuft | Brassicaceae |
| Iberis intermedia | Schleifenblume Mittlere | Intermediate Candytuft | Brassicaceae |
| Iberis linifolia | Schleifenblume Leinblättrige | Flax- leaved Candytuft | Brassicaceae |
| Iberis nana | Schleifenblume Zwerg | Dwarf Candytuft | Brassicaceae |
| Iberis nazarita | Schleifenblume Nasriden | Nazarit Candytuft | Brassicaceae |
| Iberis pectinata | Schleifenblume Kamm | Pectinate Candytuft | Brassicaceae |
| Iberis pinnata | Schleifenblume Fiederblättrige | Winged Candytuft | Brassicaceae |
| Iberis procumbens | Schleifenblume Niederliegende | Prostrate Candytuft | Brassicaceae |
| Iberis saxatilis | Schleifenblume Felsen | Rock Candytuft | Brassicaceae |
| Iberis semperflorens | Schleifenblume Immerblühende | Everyflowering Candytuft | Brassicaceae |
| Iberis sempervirens | Schleifenblume Immergrüne | Everygreen Candytuft | Brassicaceae |
| Iberis spathulata | Schleifenblume Niedrige | Spatulate Candytuft | Brassicaceae |
| Iberis timeroyii | Schleifenblume Timeroys | Timeroy's Candytuft | Brassicaceae |
| Iberis umbellata | Schleifenblume Doldige | Globe Candytuft | Brassicaceae |
| Illecebrum verticillatum | Knorpelmiere Quirlige | Coral necklace | Caryophyllaceae |
| Impatiens balfourii | Spingkraut Balfours | Balfour's Touch-me-not | Balsaminaceae |
| Impatiens balsamina | Spingkraut Garten | Garden Balsam | Balsaminaceae |
| Impatiens capensis | Spingkraut Oranges | Spotted Touch-me-not | Balsaminaceae |
| Impatiens edgeworthii | Spingkraut Buntes | Edgeworth's Touch-me-not | Balsaminaceae |
| Impatiens glandulifera | Spingkraut Drüsiges | Indian Touch-me-not | Balsaminaceae |
| Impatiens noli- tangere | Spingkraut Großes | Western Touch-me-not | Balsaminaceae |
| Impatiens parviflora | Spingkraut Kleinblütiges | Smallflower Touch-me-not | Balsaminaceae |
| Imperatoria hispanica | Meisterwurz Spanische | Spanish Masterwort | Apiaceae |
| Imperatoria ostruthium | Meisterwurz Echte | Purplish Masterwort | Apiaceae |
| Inula aschersoniana | Alant Aschersons | Ascherson's Inula | Asteraceae |
| Inula bifrons | Alant Geflügelter | Southern Inula | Asteraceae |
| Inula britannica | Alant Wiesen | British Yellowhead | Asteraceae |
| Inula candida | Alant Schneeweißer | White Inula | Asteraceae |
| Inula conyzae | Dürrwurz | Ploughman's Spikenard | Asteraceae |
| Inula ensifolia | Alant Schwertblättriger | Narrow- leaved Inula | Asteraceae |
| Inula germanica | Alant Deutscher | German Inula | Asteraceae |
| Inula helenioides | Alant Französischer | French Inula | Asteraceae |
| Inula helenium | Alant Echter | Horseheael | Asteraceae |
| Inula helvetica | Alant Schweizer | Swiss Inula | Asteraceae |
| Inula heterolepis | Alant Verschiedenschuppiger | Snow Samphire | Asteraceae |
| Inula hirta | Alant Rauer | Hairy Inula | Asteraceae |
| Inula langeana | Alant Langes | German Lange's | Asteraceae |
| Inula magnifica | Alant Großer | Giant Inula | Asteraceae |
| Inula methanaea | Alant Methana | Methana Inula | Asteraceae |
| Inula montana | Alant Berg | Mountain Inula | Asteraceae |
| Inula oculus- christi | Alant Christusaugen | Christ's Eye Inula | Asteraceae |
| Inula oxylepis | Alant Spitzschuppiger | Sharp- scaled Inula | Asteraceae |
| Inula parnassica | Alant Parnass | Mount Parnassus Inula | Asteraceae |
| Inula pseudolimonella | Alant Strandfliederblättriger Falscher | False Sea-Lavender- leaved Inula | Asteraceae |
| Inula salicina | Alant Weidenblättriger | Willow- leaved Yellowhead | Asteraceae |
| Inula spiraeifolia | Alant Sparriger | Italian Inula | Asteraceae |
| Inula subfloccosa | Alant Flockiger | Floccose Inula | Asteraceae |
| Inula verbascifolia | Alant Königskerzenblättriger | Mullein- leaved Inula | Asteraceae |
| Ipomoea batatas | Kultur- Süßkartoffel | Sweet potatoe | Convulvulaceae |
| Ipomoea cairica | Trichterwinde Kairo | Cairo Morning Glory | Convulvulaceae |
| Ipomoea hederacea | Trichterwinde Efeu | Ivyleaf Morning Glory | Convulvulaceae |
| Ipomoea imperati | Trichterwinde Strand | Beach Morning Glory | Convulvulaceae |
| Ipomoea indica | Trichterwinde Blaue | Oceanblue Morning Glory | Convulvulaceae |
| Ipomoea pandurata | Wilde Süßkartoffel | Wild Sweet potatoe | Convulvulaceae |
| Ipomoea purpurea | Trichterwinde Purpur | Tall Morning Glory | Convulvulaceae |
| Ipomoea sagittata | Trichterwinde Pfeil | Saltmarsh- Morning Glory | Convulvulaceae |
| Ipomoea tricolor | Trichterwinde Himmelblaue | Three-colored Morning- glory | Convulvulaceae |
| Ipomoea triloba | Trichterwinde Dreilappige | Three-lobed Morning- glory | Convulvulaceae |
| Iris albicans | Schwertlilie Weiße | Cemetary Iris | Iridaceae |
| Iris aphylla | Schwertlilie Nacktstängelige | Stool Iris | Iridaceae |
| Iris attica | Schwertlilie Attische | Greek Dwarf Iris | Iridaceae |
| Iris boissieri | Schwertlilie Boissiers | Boissier's Iris | Iridaceae |
| Iris filifolia | Schwertlilie Schmalblättrige | Narrow- leaf Iris | Iridaceae |
| Iris florentina | Schwertlilie Florentiner | Florentine Iris | Iridaceae |
| Iris foetidissima | Schwertlilie Überriechende | Stinking Iris | Iridaceae |
| Iris germanica | Schwertlilie Deutsche | German Iris | Iridaceae |
| Iris graminea | Schwertlilie Grasblättrige | Grass- leaved Iris | Iridaceae |
| Iris humilis | Schwertlilie Sand | Sand Iris | Iridaceae |
| Iris juncea | Schwertlilie Binsenblättrige | Rush- leaved Iris | Iridaceae |
| Iris latifolia | Schwertlilie Breitblättrige | Broad- leaf Iris | Iridaceae |
| Iris lutescens | Schwertlilie Gelbliche | Iris | Iridaceae |
| Iris marsica | Schwertlilie Marsica | Marsica Iris | Iridaceae |
| Iris orientalis | Schwertlilie Weißliche | Yellow- banded Iris | Iridaceae |
| Iris orjenii | Schwertlilie Orjen | Orjen Iris | Iridaceae |
| Iris pallida | Schwertlilie Bleiche | Dalmatian Iris | Iridaceae |
| Iris perrieri | Schwertlilie Perriers | Perrier's Iris | Iridaceae |
| Iris planifolia | Schwertlilie Flachblättrige | Flat- leaf Iris | Iridaceae |
| Iris pseudacorus | Schwertlilie Sumpf | Yellow Iris | Iridaceae |
| Iris pseudopumila | Schwertlilie Sizilianische | Sicilian Dwarf Iris | Iridaceae |
| Iris pumila | Schwertlilie Zwerg | Dwarf Iris | Iridaceae |
| Iris reichenbachiana | Schwertlilie Reichenbachs | Seashore Iris | Iridaceae |
| Iris reichenbachii | Schwertlilie Bulgarische | Bulgarian Dwarf Iris | Iridaceae |
| Iris sambucina | Schwertlilie Holunder | Elder-Scented Iris | Iridaceae |
| Iris serotina | Schwertlilie Spätblühende | Late- flowering Iris | Iridaceae |
| Iris sibirica | Schwertlilie Sibirische | Siberian Iris | Iridaceae |
| Iris sintenisii | Schwertlilie Sintenis | Sintenis's Iris | Iridaceae |
| Iris spuria | Schwertlilie Wiesen | Butterfly Iris | Iridaceae |
| Iris suaveolens | Schwertlilie Vielfarben | Turkish Dwarf Iris | Iridaceae |
| Iris tuberosa | Schwertlilie Knollige | Snakes's Head Iris | Iridaceae |
| Iris unguicularis | Schwertlilie Winter | Winter- blooming Iris | Iridaceae |
| Iris variegata | Schwertlilie Bunte | Hungarian Iris | Iridaceae |
| Iris versicolor | Schwertlilie Verschiedenfarbige | Purple Iris | Iridaceae |
| Iris xiphium | Schwertlilie Spanische | Spanish Iris | Iridaceae |
| Isoetes echinospora | Brachsenkraut Stachelsporiges | Spring Quillwort | Isoetaceae |
| Isoetes lacustris | Brachsenkraut Gewöhnliches | Lake Quillwort | Isoetaceae |
| Isopyrum thalictroides | Muschelblümchen Wiesenrauten | False Rue Anemone | Ranunculaceae |
| Iva xanthiifolia | Rispenkraut Spitzkletten | Giant Sumpweed | Asteraceae |
| Ixia dubia | Klebschwertel Zweifelhaftes | Doubtful Ixia | Iridaceae |
| Ixia maculata | Klebschwertel Geflecktes | Spotted Ixia | Iridaceae |
| Ixia paniculata | Klebschwertel Rispiges | Paniculate Ixia | Iridaceae |
| Jacaranda mimosifolia | Jacaranda Blaue | Blue Jacaranda | Bignoniaceae |
| Jacobaea abrotanifolia | Greiskraut Eberrauten | Aleutian Ragwort | Asteraceae |
| Jacobaea adonidifolia | Greiskraut Adonisblättriges | Pinnate- leaved Ragwort | Asteraceae |
| Jacobaea alpina | Greiskraut Alpen | Alpine Ragwort | Asteraceae |
| Jacobaea ambigua | Greiskraut Zweifelhaftes | Doubtful Ragwort | Asteraceae |
| Jacobaea aquatica | Greiskraut Wasser | Marsh Ragwort | Asteraceae |
| Jacobaea auricula | Greiskraut Aurikelblättriges | Auricula Ragwort | Asteraceae |
| Jacobaea boissieri | Greiskraut Boissiers | Boissier's Ragwort | Asteraceae |
| Jacobaea cannabifolia | Greiskraut Hanfblättriges | Aleutian Ragwort | Asteraceae |
| Jacobaea carniolica | Greiskraut Krainer | Carniolan Ragwort | Asteraceae |
| Jacobaea delphiniifolia | Greiskraut Ritterspornblättriges | Larkspur- leaved Ragwort | Asteraceae |
| Jacobaea disjuncta | Greiskraut Disjunktes | Disjunct Ragwort | Asteraceae |
| Jacobaea erratica | Greiskraut Spreizendes | Eastern Marsh Ragwort | Asteraceae |
| Jacobaea erucifolia | Greiskraut Raukenblättriges | Hoary Ragwort | Asteraceae |
| Jacobaea gnaphalioides | Greiskraut Filziges | Germander- like Ragwort | Asteraceae |
| Jacobaea grandidentata | Greiskraut Großzähniges | Sand Ragwort | Asteraceae |
| Jacobaea incana | Greiskraut Graues | Grey Ragwort | Asteraceae |
| Jacobaea insubrica | Greiskraut Insubrisches | Insubrian Ragwort | Asteraceae |
| Jacobaea leucophylla | Greiskraut Weißblättriges | White- leaved Ragwort | Asteraceae |
| Jacobaea lycopifolia | Greiskraut Wolfstrappblättriges | Gypsywort- leaved Ragwort | Asteraceae |
| Jacobaea maritima | Greiskraut Silber | Silver Ragwort | Asteraceae |
| Jacobaea minuta | Greiskraut Zierliches | Small Ragwort | Asteraceae |
| Jacobaea norica | Greiskraut Norisches | Norian Ragwort | Asteraceae |
| Jacobaea othonnae | Greiskraut Leinen | Linen Ragwort | Asteraceae |
| Jacobaea paludosa | Greiskraut Sumpf | Fen Ragwort | Asteraceae |
| Jacobaea pancicii | Greiskraut Pancics | Pancic's Ragwort | Asteraceae |
| Jacobaea persoonii | Greiskraut Persoons | Persoon's Ragwort | Asteraceae |
| Jacobaea subalpina | Greiskraut Berg | Mountain Ragwort | Asteraceae |
| Jacobaea uniflora | Greiskraut Einköpfiges | Haller's Ragwort | Asteraceae |
| Jacobaea vulgaris | Greiskraut Jakobs | Common Ragwort | Asteraceae |
| Jankaea heldreichii | Jankäa Thessalische | Heldreich's Jancaea | Gesneriaceae |
| Jasione cavanillesii | Sandglöckchen Cavanilles | Cavanille's Bit | Campanulaceae |
| Jasione corymbosa | Sandglöckchen Einjähriges | Coymbose Sheep's Bit | Campanulaceae |
| Jasione crispa | Sandglöckchen Krauses | Dwarf Sheep's Bit | Campanulaceae |
| Jasione foliosa | Sandglöckchen Beblättertes | Leafy Sheep's Bit | Campanulaceae |
| Jasione heldreichii | Sandglöckchen Heldreichs | Heldreich's Sheep's Bit | Campanulaceae |
| Jasione laevis | Sandglöckchen Ausdauerndes | Smooth Sheep's Bit | Campanulaceae |
| Jasione mansanetiana | Sandglöckchen Mansanets | Mansanet's Sheep's Bit | Campanulaceae |
| Jasione maritima | Sandglöckchen Strand | Beach Sheep's Bit | Campanulaceae |
| Jasione montana | Sandgöckchen Berg | Mountain Sheep's Bit | Campanulaceae |
| Jasione orbiculata | Sandgöckchen Kugeliges | Orbicular Sheep's Bit | Campanulaceae |
| Jasione penicillata | Sandglöckchen Pinsel | Paintbrush Sheep's Bit | Campanulaceae |
| Jasminum fruticans | Jasmin Strauch | Shrubby Jasmine | Oleacea |
| Jasminum humile | Jasmin Niedriger | Yellow Jasmine | Oleacea |
| Jasminum nudiflorum | Jasmin Winter | Winter Jasmine | Oleacea |
| Jasminum odoratissimum | Jasmin Duftender | Scented Jasmine | Oleacea |
| Jasminum officinale | Jasmin Echter | Summer Jasmine | Oleacea |
| Johrenia dichotoma | Johrenie Gabelige | Forked Johrenia | Apiaceae |
| Johrenia distans | Johrenie Entfernte | Distant Johrenia | Apiaceae |
| Jordania confertifolia | Gipskraut Rhodisches | Rhodian Baby's Breath | Caryophyllaceae |
| Jovibarba globifera | Fransenhauswurz Gewöhnliche | Spouting Houseleek | Crassulaceae |
| Jovibarba heuffelii | Fransenhauswurz Balkan | Heuffel's Houseleek | Crassulaceae |
| Juglans cinerea | Walnuss Graue | Butternut | Juglandaceae |
| Juglans nigra | Walnuss Schwarze | Black Walnut | Juglandaceae |
| Juglans regia | Walnuss Echte | Common Walnut | Juglandaceae |
| Juncus acutiflorus | Binse Spitzblütige | Sharpflower Rush | Juncaceae |
| Juncus acutus | Binse Stechende | Sharp Rush | Juncaceae |
| Juncus alpinoarticulatus | Binse Alpen | Northern Green Rush | Juncaceae |
| Juncus anceps | Binse Zweischneidige | Danish Sand Rush | Juncaceae |
| Juncus arcticus | Binse Arktische | Arctic Rush | Juncaceae |
| Juncus articulatus | Binse Glieder | Jointleaf Rush | Juncaceae |
| Juncus atratus | Binse Schwarzblütige | Dark Rush | Juncaceae |
| Juncus balticus | Binse Baltische | Baltic Rush | Juncaceae |
| Juncus biglumis | Binse Zweiblütige | Two- hulled Rush | Juncaceae |
| Juncus bufonius | Binse Kröten | Toad Rush | Juncaceae |
| Juncus bulbosus | Binse Zwiebel | Toad Rush | Juncaceae |
| Juncus capitatus | Binse Kopf | Leafybract Dwarf Rush | Juncaceae |
| Juncus castaneus | Binse Kastanien | Chestnut Rush | Juncaceae |
| Juncus compressus | Binse Zusammengedrückte | Roundfruit Rush | Juncaceae |
| Juncus conglomeratus | Binse Knäuel | Compact Rush | Juncaceae |
| Juncus dichtomus | Binse Gabelige | Forked Rush | Juncaceae |
| Juncus dudleyi | Binse Dudleys | Dudley's Rush | Juncaceae |
| Juncus effusus | Binse Flatter | Common Rush | Juncaceae |
| Juncus emmanuelis | Binse Emmanuels | Emmanuel's Rush | Juncaceae |
| Juncus ensifolius | Binse Schwertblättrige | Sword- leaf Rush | Juncaceae |
| Juncus fernandez- carvajaliae | Binse Fernandez- Carvajal | Fernandez- Carvajal's Rush | Juncaceae |
| Juncus filiformis | Binse Faden | Thread Rush | Juncaceae |
| Juncus foliosus | Binse Blattreiche | Leafy Rush | Juncaceae |
| Juncus fontanesii | Binse Desfontaines | Desfontaines's Rush | Juncaceae |
| Juncus gerardii | Binse Salz | Saltmeadow Rush | Juncaceae |
| Juncus heldreichianus | Binse Heldreichs | Heldreich's Rush | Juncaceae |
| Juncus heterophyllus | Binse Verschiedenblättrige | Different- leaved Rush | Juncaceae |
| Juncus hybridus | Binse Bastard | Hybrid Rush | Juncaceae |
| Juncus inflexus | Binse Blaugrüne | European Meadow Rush | Juncaceae |
| Juncus jacquinii | Binse Jacquins | Jacquin's Rush | Juncaceae |
| Juncus littoralis | Binse Küsten | Coastal Rush | Juncaceae |
| Juncus maritimus | Binse Strand | Sea Rush | Juncaceae |
| Juncus minutulus | Binse Kleinste | Smallest Rush | Juncaceae |
| Juncus monanthos | Binse Einblütige | Host's Rush | Juncaceae |
| Juncus pygmaeus | Binse Zwerg | Pygmy Rush | Juncaceae |
| Juncus ranarius | Binse Frosch | Frog Rush | Juncaceae |
| Juncus rechingeri | Binse Rechingers | Rechinger's Rush | Juncaceae |
| Juncus requienii | Binse Requiens | Requien's Rush | Juncaceae |
| Juncus rigidus | Binse Steife | Stiff Rush | Juncaceae |
| Juncus rugosus | Binse Runzlige | Rugose Rush | Juncaceae |
| Juncus sorrentinii | Binse Sorrentinos | Sorrentino's Rush | Juncaceae |
| Juncus sphaerocarpus | Binse Kugelfrucht | Globe- fruited Rush | Juncaceae |
| Juncus squarrosus | Binse Sparrige | Heath Rush | Juncaceae |
| Juncus striatus | Binse Gestreifte | Striped Rush | Juncaceae |
| Juncus stygius | Binse Moor | Bog Rush | Juncaceae |
| Juncus subnodulosus | Binse Stumpfblütige | Bluntflower Rush | Juncaceae |
| Juncus subulatus | Binse Herzblütige | Somerset Rush | Juncaceae |
| Juncus tenageia | Binse Sand | Sand Rush | Juncaceae |
| Juncus tenuis | Binse Zarte | Slender Rush | Juncaceae |
| Juncus thomasii | Binse Thomas' | Thomas's Rush | Juncaceae |
| Juncus tingitanus | Binse Tanger | Tanger Rush | Juncaceae |
| Juncus trifidus | Binse Dreiblatt | Highland Rush | Juncaceae |
| Juncus triglumis | Binse Dreiblütige | Three- hulled Rush | Juncaceae |
| Juncus valvatus | Binse Klappen | Valvate Rush | Juncaceae |
| Juniperus badia | Wacholder Brown | Brown Juniper | Cupressaceae |
| Juniperus communis | Wacholder Gewöhnlicher | Syrian Juniper | Cupressaceae |
| Juniperus drupacea | Wacholder Syrischer | Syrian Juniper | Cupressaceae |
| Juniperus excelsa | Wacholder Griechischer | Greek Juniper | Cupressaceae |
| Juniperus foetidissima | Wacholder Stinkender | Stinking Juniper | Cupressaceae |
| Juniperus macrocarpa | Wacholder Großfrüchtiger | Large- fruited Juniper | Cupressaceae |
| Juniperus navicularis | Wacholder Kahnförmiger | Boat- shaped Juniper | Cupressaceae |
| Juniperus oxycedrus | Wacholder Stech- | Prickly Juniper | Cupressaceae |
| Juniperus phoenicea | Wacholder Phönizischer | Phoenician Juniper | Cupressaceae |
| Juniperus sabina | Wacholder Stink- | Savin Juniper | Cupressaceae |
| Juniperus thurifera | Wacholder Weihrauch | Spanischer Juniper | Cupressaceae |
| Juniperus turbinata | Wacholder Kegel | Turbinate Juniper | Cupressaceae |
| Juniperus virginiana | Wacholder Virginischer | Virginian Juniper | Cupressaceae |
| Jurinea bocconei | Silberscharte Boccones | Boccone's Jurinea | Asterceae |
| Jurinea cadmea | Silberscharte Kadmeisches | Cadmean Jurinea | Asterceae |
| Jurinea consanguinea | Silberscharte Scharlachrote | Scarlet Jurinea | Asterceae |
| Jurinea cyanoides | Silberscharte Sand | Sand Jurinea | Asterceae |
| Jurinea fontqueri | Silberscharte Fontquers | Fontquer's Jurinea | Asterceae |
| Jurinea glycacantha | Silberscharte Süßdorn | Sweetthorn Jurinea | Asterceae |
| Jurinea humilis | Silberscharte Niedrige | Dwarf Jurinea | Asterceae |
| Jurinea micevskii | Silberscharte Micevskis | Micevski's Jurinea | Asterceae |
| Jurinea mollis | Silberscharte Weiche | Soft Jurinea | Asterceae |
| Jurinea pinnata | Silberscharte Gefiederte | Pinnate Jurinea | Asterceae |
| Jurinea taygetea | Silberscharte Taygetos | Taygetos Jurinea | Asterceae |
| Kadenia dubia | Silge Brenndolden | Doubtful Milk- Parsley | Apiaceae |
| Kali soda | Salzkraut Soda | Opposite- leaved Saltwort | Chenopodiaceae |
| Kali tragus | Salzkraut Dorniges | Prickly Saltwort | Chenopodiaceae |
| Kali turgida | Salzkraut Kali | Common Saltwort | Chenopodiaceae |
| Kalmia angustifolia | Lorbeerrose Schmalblättrige | Sheep Laurel | Ericaceae |
| Kalmia latifolia | Lorbeerrose Breitblättrige | Mountain Laurel | Ericaceae |
| Kalmia procumbens | Alpenazalee Niederliegende | Alpine Azalea | Ericaceae |
| Katapsuxis silaifolia | Silge Silaublättrige | Silaum- leaved Milk- Parsley | Apiaceae |
| Kerria japonica | Kerrie Japanische | Japanese Kerria | Rosaceae |
| Kickxia cirrhosa | Tännelkraut Windendes | Winding Fluellen | Plantaginaceae |
| Kickxia commutata | Tännelkraut Verwechseltes | Perennial Fluellen | Plantaginaceae |
| Kickxia elatine | Tännelkraut Spießblättriges | Sharp- leaved Fluellen | Plantaginaceae |
| Kickxia lanigera | Tännelkraut Wolliges | Wooly Fluellen | Plantaginaceae |
| Kickxia spuria | Tännelkraut Eiblättriges | Round- leaved Fluellen | Plantaginaceae |
| Kitaibelia vitifolia | Kitaibelie Weinblättrige | Vine- leaved Kitaibelia | Campanulaceae |
| Klasea algarbiensis | Scharte Algarve | Algarve Klasea | Asteraceae |
| Klasea boetica | Scharte Baetische | Baetian Klasea | Asteraceae |
| Klasea cretica | Scharte Kretische | Cretan Klasea | Asteraceae |
| Klasea flavescens | Scharte Gelbliche | Yellowish Klasea | Asteraceae |
| Klasea integrifolia | Scharte Ganzblättrige | Entire- leaved Klasea | Asteraceae |
| Klasea legionensis | Scharte Leonesische | Leon Klasea | Asteraceae |
| Klasea lycopifolia | Scharte Wolfstrappblättrige | Gypsywort- leaved Klasea | Asteraceae |
| Klasea moreana | Scharte Mores | More's Klasea | Asteraceae |
| Klasea nudicaulis | Scharte Nacktstängelige | Leafless- stemmed Klasea | Asteraceae |
| Klasea pinnatifida | Scharte Fiederspaltige | Pinnatifid- leaved Klasea | Asteraceae |
| Klasea radiata | Scharte Strahlen | Radiate Klasea | Asteraceae |
| Knautia ambigua | Witwenblume Zweifelhafte | Doubtful Widowflower | Dipsacaceae |
| Knautia arvensis | Witwenblume Acker | Field Widowflower | Dipsacaceae |
| Knautia arvernensis | Witwenblume Auverngne | Auvergne Widowflower | Dipsacaceae |
| Knautia baldensis | Witwenblume Monte Baldo | Monte Baldo Widowflower | Dipsacaceae |
| Knautia basaltica | Witwenblume Basalt | Basalt Widowflower | Dipsacaceae |
| Knautia carinthiaca | Witwenblume Kärntner | Carinthian Widowflower | Dipsacaceae |
| Knautia collina | Witwenblume Hügel | Purple Widowflower | Dipsacaceae |
| Knautia degenii | Witwenblume Degens | Degen's Widowflower | Dipsacaceae |
| Knautia dinarica | Witwenblume Dinarische | Dinarian Widowflower | Dipsacaceae |
| Knautia dipsacifolia | Witwenblume Wald | Wood Widowflower | Dipsacaceae |
| Knautia drymeia | Witwenblume Ungarische | Hungarian Widowflower | Dipsacaceae |
| Knautia fleischmannii | Witwenblume Fleischmanns | Fleischmann's Widowflower | Dipsacaceae |
| Knautia godetii | Witwenblume Godets | Godet's Widowflower | Dipsacaceae |
| Knautia illyrica | Witwenblume Illyrische | Illyrian Widowflower | Dipsacaceae |
| Knautia integrifolia | Witwenblume Einjährige | Whole- leaved Widowflower | Dipsacaceae |
| Knautia kitaibelii | Witwenblume Gelbe | Kitaibel's Widowflower | Dipsacaceae |
| Knautia longifolia | Witwenblume Langblättrige | Long- leaved Widowflower | Dipsacaceae |
| Knautia lucana | Witwenblume Lukanische | Lucanian Widowflower | Dipsacaceae |
| Knautia macedonica | Witwenblume Mazedonische | Macedonian Widowflower | Dipsacaceae |
| Knautia magnifica | Witwenblume Prächtige | Magnificent Widowflower | Dipsacaceae |
| Knautia midzoresis | Witwenblume Midzor | Midzor Widowflower | Dipsacaceae |
| Knautia mollis | Witwenblume Weiche | Soft Widowflower | Dipsacaceae |
| Knautia norica | Witwenblume Norische | Norican Widowflower | Dipsacaceae |
| Knautia orientalis | Witwenblume Orientalische | Oriental Widowflower | Dipsacaceae |
| Knautia persicina | Witwenblume Garda | Garda Widowflower | Dipsacaceae |
| Knautia ressmannii | Witwenblume Ressmanns | Ressmann's Widowflower | Dipsacaceae |
| Knautia rupicola | Witwenblume Felsen | Rock Widowflower | Dipsacaceae |
| Knautia sarajevensis | Witwenblume Bosnische | Bosnian Widowflower | Dipsacaceae |
| Knautia subcanescens | Witwenblume Graue | Grey Widowflower | Dipsacaceae |
| Knautia subscaposa | Witwenblume Schaft | Subscapose Widowflower | Dipsacaceae |
| Knautia transalpina | Witwenblume Südalpen | South- alpine Widowflower | Dipsacaceae |
| Knautia velutina | Witwenblume Samtige | Velvet Widowflower | Dipsacaceae |
| Kolkwitzia amabilis | Kolkwitzie Liebliche | Beautybush | Caprifoliaceae |
| Koelpinia linearis | Koelpinie Schmalblättrige | Narrow- leaved Koelpinia | Asteraceae |
| Koelreuteria paniculata | Blasenesche Rispige | Golden Raintree | Sapindaceae |
| Koenigia alpinua | Bergknöterich Alpen | Alpine Knotweed | Polygonaceae |
| Koenigia campanulata | Bergknöterich Glockenblütiger | Bellflower Knotweed | Polygonaceae |
| Koenigia polystachia | Bergknöterich Stutzblättriger | Himalayan Knotweed | Polygonaceae |
| Koenigia weyrichii | Bergknöterich Weyrichs | Weyrich's Knotweed | Polygonaceae |
| Koenigia x fennica | Bergknöterich Garten | Finnish Knotweed | Polygonaceae |
| Kosteletzkya pentacarpos | Kosteletzkie Fünffrüchtige | Seashore Mallow | Malvaceae |
| Krascheninnikovia cerastoides | Hornmelde Europäische | Pamirian Winterfat | Chenopodiaceae |
| Krubera peregrina | Krubera Fremde | Alien Krubera | Apiaceae |
| Kundmannia sicula | Kundmannie Sizilianische | Sicilian Kundmannia | Apiaceae |