Hispidulous. Minutely hispid.
Hoary. Grayish-white with a fine close pubescence.
Homogamous. Bearing but one kind of flowers.
Hooded. Shaped like a hood or cowl.
Hyaline. Transparent or translucent.
Hybrid. A cross-breed of two species.
Hypogynous. Situated on the receptacle beneath the ovary and free from it and from the calyx; having the petals and stamens so situated.
Imbricate. Overlapping, either vertically or spirally, where the lower piece covers the base of the next higher, or laterally, as in the æstivation of a calyx or corolla, where at least one piece must be wholly external and one internal.
Immersed. Growing wholly under water; wholly covered by the involucral leaves, as sometimes the capsule in Hepaticæ.
Incised. Cut sharply and irregularly, more or less deeply.