Lophomyrtus x ralphii 'Gloriosa' Lophostemon confertus
Lophostemon confertus 'Variegatus' Loropetalum chinense
Loropetalum chinense 'Razzleberry®' Loropetalum chinense 'Sizzling Pink'
Loropetalum chinense var. rubrum Loropetalum chinense var. rubrum 'Burgundy'
Loropetalum chinense var. rubrum 'Crimson Fire' Loropetalum chinense var. rubrum 'Plum Delight'
Lotus berthelotii Lotus corniculatus
Lotus maculatus Lotus sessilifolius
Luculia intermedia Ludwigia peploides
Ludwigia sedioides Luetkea pectinata
Luma apiculata Lunaria annua
Lunaria annua 'Honesty' Lupinus arbustus
Lupinus polyphyllus Lupinus polyphyllus 'My Castle'
Lupinus polyphyllus 'Popsicle' Lupinus polyphyllus 'Russell Hybrid'
Lupinus polyphyllus 'The Governor' Lupinus succulentus
Lupinus texensis Luzula maxima
Luzula maxima 'Aurea' Luzula nivea
Lycaste giquiste Lycaste x lucianii
Lycaste macrophylla ssp. xanthocheila Lycaste tricolor
Lychnis x arkwrightii 'Orange Gnome' Lychnis x arkwrightii 'Vesuvius'
Lychnis chalcedonica Lychnis coronaria
Lychnis coronaria 'Dancing Ladies' Lychnis coronaria 'Gardener's World'
Lychnis flos-cuculi plena 'Jenny' Lychnis flos-jovis 'Peggy'
Lychnis sieboldii Lycianthes rantonnetii
Lycianthes rantonnetii 'Royal Robe' Lycium andersonii
Lycium carolinianum Lycium fremontii
Lycopodium digitatum Lycoris chinensis
Lycoris x haywardii Lycoris x houdyshelii
Lycoris radiata Lycoris squamigera
Lygeum sparteum Lygodium japonicum
Lyonia lucida Lyonothamnus floribundus var. aspleniifolius
Lysichiton americanum Lysiloma latisiliqua
Lysiloma microphylla var. thornberi Lysiloma sabicu
Lysimachia 'Goldilocks' Lysimachia ciliata
Lysimachia ciliata 'Atropurpurea' Lysimachia ciliata 'Firecracker'
Lysimachia ciliata 'Purpurea' Lysimachia clethroides
Lysimachia congestiflora 'Persian Chocolate' Lysimachia ephemerum
Lysimachia lysii Lysimachia nummularia
Lysimachia nummularia 'Aurea' Lysimachia procumbens 'Ecosatin'
Lysimachia punctata Lysimachia punctata 'Alexander'
Lysimachia punctata 'Variegata' Lythrum anceps
Lythrum salicaria Lythrum salicaria 'Firecandle'
Lythrum salicaria 'Robert' Lythrum virgatum
Lythrum virgatum 'Morden Gleam' Lythrum virgatum 'Morden Pink'
Maackia amurensis Maackia amurensis var. buergeri
Macadamia integrifolia x tetraphylla 'Dr. Beaumont' Machaeranthera orcuttii
Macleaya cordata Maclura pomifera
Maclura pomifera 'Double O' Macrozamia communis
Macrozamia riedlei Madhuca longifolia