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Helleborus x hybridus 'Double Pink'
Helleborus x hybridus 'Double Red'
Helleborus x hybridus 'Double White Spotted'
Helleborus x hybridus 'Experimental Doubles'
Helleborus x hybridus 'Imports PKF'
Helleborus x hybridus 'Picotee'
Helleborus x hybridus 'Primrose Yellow Picotee'
Helleborus x hybridus 'Semi Doubles'
Helleborus x hybridus 'Single Pink'
Helleborus x hybridus 'Single Purple'
Helleborus x hybridus 'Single Red'
Helleborus x hybridus 'Slatel Grey'
Helleborus x hybridus 'White Red Centre'
Helleborus x hybridus 'White'
Helleborus x hybridus 'Yellow Primrose'
Helleborus x sternii 'Boughton Beauty'
Helmholtzia acorifolia F.Muell.
Helmholtzia glaberrima (Hook.f.) Caruel
Hemarthria uncinata R.Br.
Hemarthria uncinata R.Br. var. uncinata
Hemerocallis 'Betty Woods'
Hemerocallis 'Dazzla'
Hemerocallis 'Ed Murray'
Hemerocallis 'Evening Bell'
Hemerocallis 'Hearts Glee'
Hemerocallis 'Iditarod'
Hemerocallis 'Olive Bailey Langdon'
Hemerocallis 'Saucy Rogue'
Hemerocallis 'Undulata'
Hemerocallis 'Unknown'
Hemerocallis 'Yellow Lollipop'
Hemerocallis sp. 'Christmas Day'
Hemerocallis sp. 'Joan Senior'
Hemerocallis sp. 'Lady Bright Eyes'
Hepatica acutiloba DC.
Herniaria baetica
Herreria stellata
Hesperoxiphion peruviana (Barker) Barker
Heteromeles arbutifolia
Heteromorpha trifoliata Eckl. & Zeyh.
Heterotheca pumila (Greene) Semple
Heuchera 'Can Can'
Heuchera 'Grace'
Heuchera 'Palace Purple'
Heuchera elegans Benth.