Horoeka Horse Cane
Horse Nettle Horsechestnut, California (spp.)
Horsechestnut, California 'Canyon Pink' Horsechestnut, Common (spp.)
Horsechestnut, Common 'Memmingeri' Horsechestnut, Common 'Sterile Horsechestnut'
Horsechestnut, Common 'Umbraculifera' Horsechestnut, European (spp.)
Horsechestnut, European 'Memmingeri' Horsechestnut, European 'Sterile Horsechestnut'
Horsechestnut, European 'Umbraculifera' Horsechestnut, Indian (spp.)
Horsechestnut, Indian 'Sydney Pearce' Horsechestnut, Japanese
Horsechestnut, Red (spp.) Horsechestnut, Red 'Briotii'
Horsechestnut, Red 'Rubro-petiolata' Horsechestnut, Ruby Red (spp.)
Horsechestnut, Ruby Red 'Briotii' Horsechestnut, Ruby Red 'Rubro-petiolata'
Horsefoot Horse-heal
Horsehoof Horsemint (spp.)
Horsemint 'Jacob Cline' Horsemint 'Marshal's Delight'
Horsemint 'Panorama' Horsemint: punctata
Horses Tail Horsetail
Horsetail Restio Horsetail Tree
Horsetail Tree, Gray Horsetail, Common
Horsetail, Field Horsetail, Mini
Horsetail, Rough Horsetail: hyemale
'Hortensis' Bracted Hydrangea 'Hortensis' Japanese Aster