Bromus arvensis (field brome)

Hydrocotyle prolifera (whorled marshpennywort)
Hydrocotyle sibthorpioides (lawn marshpennywort)
Hydrocotyle verticillata (whorled marshpennywort)
Hylotelephium telephioides (Allegheny stonecrop)
Hymenopappus filifolius (fineleaf hymenopappus)
Hymenopappus flavescens (collegeflower)
Hypericum adpressum (creeping St. Johnswort)
Hypericum boreale (northern St. Johnswort)
Hypericum calycinum
Hypericum canadense (lesser Canadian St. Johnswort)
Hypericum drummondii (nits and lice)
Hypericum ellipticum (pale St. Johnswort)
Hypericum frondosum (cedarglade St. Johnswort)
Hypericum gentianoides (orangegrass)
Hypericum graveolens (mountain St. Johnswort)
Hypericum gymnanthum (claspingleaf St. Johnswort)
Hypericum hirsutum
Hypericum humifusum
Hypericum kalmianum (Kalm's St. Johnswort)
Hypericum montanum
Hypericum mutilum (dwarf St. Johnswort)
Hypericum perforatum
Hypericum pseudomaculatum (false spotted St. Johnswort)
Hypericum tetrapterum
Hypoxis hirsuta (common goldstar)
Hyssopus officinalis
Iberis sempervirens
Iberis umbellata
Iceland

Image of Bromus arvensis (field brome) 1
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 1: 279.