Haloragaceae, Family
Hammarbya, Genus
Hedera, Genus
Helianthemum, Genus
Helianthus, Genus
Helichrysum, Genus
Helictotrichon, Genus
Helleborus, Genus
Heracleum, Genus
Herminium, Genus
Herniaria, Genus
Hesperis, Genus
Hibiscus, Genus
Hieracium, Genus
Himantoglossum, Genus
Hippocastanaceae, Family
– synoniem van Sapindaceae, Family
Hippocrepis, Genus
Hippophae, Genus
Hippuridaceae, Family
– synoniem van Plantaginaceae, Family
Hippuris, Genus
Hirschfeldia, Genus
Holcus, Genus
Holosteum, Genus
Honckenya, Genus
Hordelymus, Genus
Hordeum, Genus
Hottonia, Genus
Humulus, Genus
Huperzia, Genus
Hyacinthoides, Genus
Hyacinthus, Genus
Hydrangeaceae, Family
Hydrocharis, Genus
Hydrocharitaceae, Family
Hydrocotyle, Genus
Hydrophyllaceae, Family
– synoniem van Boraginaceae, Family
Hyoscyamus, Genus
Hypericaceae, Family
Hypericum, Genus
Hypochaeris, Genus
Hyssopus, Genus