Horehound          

Horned Pondweed          

Horned Spurge          

Hornwort          

Horsebrush          

Horsekiller          

Horsetail          

Horsetail Milkweed          

Horseweed          

Hot Springs Fimbry          

Hourglass Peaseed          

Huachuca Hawkweed          

Huachuca Mountain Dwarf Mistletoe          

Huachuca Mountain Eryngo          

Huachuca Mountain Geranium          

Huachuca Mountain Indian Paintbrush          

Huachuca Mountain Lupine          

Huachuca Mountain Milkvetch          

Huachuca Mountain Milkwort          

Huachuca Mountain Morning-glory          

Huachuca Mountain Ragwort          

Huachuca Mountain Rocktrumpet          

Huachuca Mountain Sedge          

Huachuca Mountain Spurge          

Huachuca Mountain Stonecrop          

Hummingbird Trumpet          

Husk Tomato          

Hybrid Cloakfern          

Hybrid Crack Willow          

Hydrilla          

Hydrocotyle          

Hyssopleaf Sandmat