HYBRID: The offspring of genetically different parents, often produced accidentally or artificially in cultivation, but occasionally arising in the wild.
HYBRIDIZABLE: Capable of producing hybrid offspring by crossing with another variety, species, or genus.
HYBRIDIZATION: The practice of crossbreeding between two species or wild types; this term is used to indicate crossbreeding generally, whether between species or varieties.
HYBRIDIZE: To produce or cause to produce a hybrid.
HYBRIDIZER: A person who hybridizes plants.
HYDROGEN: An element, found in the soil, that plants need in order to grow.
HYDROPHILY: The flowers are produced under the surface of the water and that is where the transfer of pollen takes place. Fairly rare occurrence.
HYDROPHYTE: A plant that grows in and is adapted to an aquatic or very wet habitat.
HYDROPONICS: A method of growing plants in water rather than soil. The plant's roots are suspended in a nutrient solution.
HYDROUS: Containing water.
HYDROXYAPATITE: A member of the apatite groups or mineral rich in the hydroxyl groups.
HYGROPHYTE: A plant growing in wet places.
HYPANTHIAL: Pertaining to or resembling a hypanthium.
HYPANTHIUM: The part of certain flowers usually formed by the fusion of the lower portions of their petals, sepals, and stamens.
HYPERTROPHY: Excessive growth or overdevelopement of the organs of plants.
HYPOCHILE: The basal part of the labellum (of an Orchid) in some groups, such as Stanhopea.
HYPOCOTYL: The part of the stem of a plant embryo or seedling that is below the seed leaves.
HYPOCOTYLEDONARY: Located below the seed leaves.
HYPOGENOUS: Growing on the under surface, especially pertaining to a fungus on the underside of a leaf.
HYPOGYNOUS: Having the sepals, stamens and petals arising from the portion of a flower situated below the ovary.
HYPOGYNY: The state of being hypogynous.
HYPOPHYLLOUS: Situated on the underside of a leaf.
HYPSOPHYLL: A leaf located underneath spore-bearing leaves.
HYPSOPHYLLARY: Pertaining to the hypsophyll.