Hackberry
Hair-like Sedge
Hairgrass
Hairspine Pricklypear
Hairy Bugseed
Hairy Crabgrass
Hairy Evening Primrose
Hairy False Goldenaster
Hairy Grama
Hairy Hedgenettle
Hairy Moss
Hairy Purslane Speedwell
Hairy Rockcress
Hairy Sedge
Hairy Waterclover
Hairy Whitetop
Hairy Wildrye
Hairy Woodland Brome
Hairystem Gooseberry
Halfchaff Sedge
Halimodendron
Handsome Sedge
Hard Fescue
Hardheads
Hardstem Bulrush
Hawksbeard
Hawkweed
Hawthorn
Hazel Dodder
Hazelnut
Heartleaf Arnica
Heartleaf Buttercup
Heavy Sedge
Hedge False Bindweed
Hedgehyssop
Hedgemustard
Hedgenettle
Heliopsis
Heliotrope
Hemlock Waterparsnip
Hemp
Hempnettle
Henbane
Henbit Deadnettle