All Plants: Horo - Hosh (51)
Horoeka
Horse Cane
Horse Gentian
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 Cherokee
Horsemint Jacob Cline
Horsemint Mahogany
Horsemint Marshal's Delight
Horsemint Mohawk
Horsemint Panorama
Horsemint Prairie Night
Horsemint Purpurkrone
Horsemint Vintage Wine
Horsemint: punctata
Horses Tail
Horsetail
Horsetail Restio
Horsetail Tree
Horsetail Tree, Gray
Horsetail, Common
Horsetail, Field
Horsetail, Mini
Horsetail, Rough
Horsetail: hyemale
Horsfall's Morning Glory
Hortensis Bracted Hydrangea
Hortensis Japanese Aster
Hoshiyadori Painted Maple