Hoary. Gray-white with a fine, close pubescence.
Homogeneous. Uniform; composed of similar parts or elements.
Hybrid. A cross between two nearly related species, formed by the action of the pollen of one upon the pistil of the other, yielding an intermediate form.
Imbricate. Overlapping, like the shingles on a roof.
Indehiscent. Not opening by valves or slits; remaining persistently closed.
Indigenous. Native and original to a region.
Inflorescence. The flowering part of a plant, and especially its arrangement.
Internode. The portion of a stem between two nodes.
Involucral. Pertaining to an involucre.
Involucre. A circle of bracts surrounding a flower or cluster of flowers.